EditeurPanovisu: Fichier source de panovisu/libs/three.js/three.js

console.warn( 'Scripts "build/three.js" and "build/three.min.js" are deprecated with r150+, and will be removed with r160. Please use ES Modules or alternatives: https://threejs.org/docs/index.html#manual/en/introduction/Installation' );

(function (global, factory) {

    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :

    typeof define === 'function' && define.amd ? define(['exports'], factory) :

    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.THREE = {}));

})(this, (function (exports) { 'use strict';


    const REVISION = '160';


    const MOUSE = { LEFT: 0, MIDDLE: 1, RIGHT: 2, ROTATE: 0, DOLLY: 1, PAN: 2 };

    const TOUCH = { ROTATE: 0, PAN: 1, DOLLY_PAN: 2, DOLLY_ROTATE: 3 };

    const CullFaceNone = 0;

    const CullFaceBack = 1;

    const CullFaceFront = 2;

    const CullFaceFrontBack = 3;

    const BasicShadowMap = 0;

    const PCFShadowMap = 1;

    const PCFSoftShadowMap = 2;

    const VSMShadowMap = 3;

    const FrontSide = 0;

    const BackSide = 1;

    const DoubleSide = 2;

    const TwoPassDoubleSide = 2; // r149

    const NoBlending = 0;

    const NormalBlending = 1;

    const AdditiveBlending = 2;

    const SubtractiveBlending = 3;

    const MultiplyBlending = 4;

    const CustomBlending = 5;

    const AddEquation = 100;

    const SubtractEquation = 101;

    const ReverseSubtractEquation = 102;

    const MinEquation = 103;

    const MaxEquation = 104;

    const ZeroFactor = 200;

    const OneFactor = 201;

    const SrcColorFactor = 202;

    const OneMinusSrcColorFactor = 203;

    const SrcAlphaFactor = 204;

    const OneMinusSrcAlphaFactor = 205;

    const DstAlphaFactor = 206;

    const OneMinusDstAlphaFactor = 207;

    const DstColorFactor = 208;

    const OneMinusDstColorFactor = 209;

    const SrcAlphaSaturateFactor = 210;

    const ConstantColorFactor = 211;

    const OneMinusConstantColorFactor = 212;

    const ConstantAlphaFactor = 213;

    const OneMinusConstantAlphaFactor = 214;

    const NeverDepth = 0;

    const AlwaysDepth = 1;

    const LessDepth = 2;

    const LessEqualDepth = 3;

    const EqualDepth = 4;

    const GreaterEqualDepth = 5;

    const GreaterDepth = 6;

    const NotEqualDepth = 7;

    const MultiplyOperation = 0;

    const MixOperation = 1;

    const AddOperation = 2;

    const NoToneMapping = 0;

    const LinearToneMapping = 1;

    const ReinhardToneMapping = 2;

    const CineonToneMapping = 3;

    const ACESFilmicToneMapping = 4;

    const CustomToneMapping = 5;

    const AgXToneMapping = 6;

    const AttachedBindMode = 'attached';

    const DetachedBindMode = 'detached';


    const UVMapping = 300;

    const CubeReflectionMapping = 301;

    const CubeRefractionMapping = 302;

    const EquirectangularReflectionMapping = 303;

    const EquirectangularRefractionMapping = 304;

    const CubeUVReflectionMapping = 306;

    const RepeatWrapping = 1000;

    const ClampToEdgeWrapping = 1001;

    const MirroredRepeatWrapping = 1002;

    const NearestFilter = 1003;

    const NearestMipmapNearestFilter = 1004;

    const NearestMipMapNearestFilter = 1004;

    const NearestMipmapLinearFilter = 1005;

    const NearestMipMapLinearFilter = 1005;

    const LinearFilter = 1006;

    const LinearMipmapNearestFilter = 1007;

    const LinearMipMapNearestFilter = 1007;

    const LinearMipmapLinearFilter = 1008;

    const LinearMipMapLinearFilter = 1008;

    const UnsignedByteType = 1009;

    const ByteType = 1010;

    const ShortType = 1011;

    const UnsignedShortType = 1012;

    const IntType = 1013;

    const UnsignedIntType = 1014;

    const FloatType = 1015;

    const HalfFloatType = 1016;

    const UnsignedShort4444Type = 1017;

    const UnsignedShort5551Type = 1018;

    const UnsignedInt248Type = 1020;

    const AlphaFormat = 1021;

    const RGBAFormat = 1023;

    const LuminanceFormat = 1024;

    const LuminanceAlphaFormat = 1025;

    const DepthFormat = 1026;

    const DepthStencilFormat = 1027;

    const RedFormat = 1028;

    const RedIntegerFormat = 1029;

    const RGFormat = 1030;

    const RGIntegerFormat = 1031;

    const RGBAIntegerFormat = 1033;


    const RGB_S3TC_DXT1_Format = 33776;

    const RGBA_S3TC_DXT1_Format = 33777;

    const RGBA_S3TC_DXT3_Format = 33778;

    const RGBA_S3TC_DXT5_Format = 33779;

    const RGB_PVRTC_4BPPV1_Format = 35840;

    const RGB_PVRTC_2BPPV1_Format = 35841;

    const RGBA_PVRTC_4BPPV1_Format = 35842;

    const RGBA_PVRTC_2BPPV1_Format = 35843;

    const RGB_ETC1_Format = 36196;

    const RGB_ETC2_Format = 37492;

    const RGBA_ETC2_EAC_Format = 37496;

    const RGBA_ASTC_4x4_Format = 37808;

    const RGBA_ASTC_5x4_Format = 37809;

    const RGBA_ASTC_5x5_Format = 37810;

    const RGBA_ASTC_6x5_Format = 37811;

    const RGBA_ASTC_6x6_Format = 37812;

    const RGBA_ASTC_8x5_Format = 37813;

    const RGBA_ASTC_8x6_Format = 37814;

    const RGBA_ASTC_8x8_Format = 37815;

    const RGBA_ASTC_10x5_Format = 37816;

    const RGBA_ASTC_10x6_Format = 37817;

    const RGBA_ASTC_10x8_Format = 37818;

    const RGBA_ASTC_10x10_Format = 37819;

    const RGBA_ASTC_12x10_Format = 37820;

    const RGBA_ASTC_12x12_Format = 37821;

    const RGBA_BPTC_Format = 36492;

    const RGB_BPTC_SIGNED_Format = 36494;

    const RGB_BPTC_UNSIGNED_Format = 36495;

    const RED_RGTC1_Format = 36283;

    const SIGNED_RED_RGTC1_Format = 36284;

    const RED_GREEN_RGTC2_Format = 36285;

    const SIGNED_RED_GREEN_RGTC2_Format = 36286;

    const LoopOnce = 2200;

    const LoopRepeat = 2201;

    const LoopPingPong = 2202;

    const InterpolateDiscrete = 2300;

    const InterpolateLinear = 2301;

    const InterpolateSmooth = 2302;

    const ZeroCurvatureEnding = 2400;

    const ZeroSlopeEnding = 2401;

    const WrapAroundEnding = 2402;

    const NormalAnimationBlendMode = 2500;

    const AdditiveAnimationBlendMode = 2501;

    const TrianglesDrawMode = 0;

    const TriangleStripDrawMode = 1;

    const TriangleFanDrawMode = 2;

    const LinearEncoding = 3000;

    const sRGBEncoding = 3001;

    const BasicDepthPacking = 3200;

    const RGBADepthPacking = 3201;

    const TangentSpaceNormalMap = 0;

    const ObjectSpaceNormalMap = 1;


    // Color space string identifiers, matching CSS Color Module Level 4 and WebGPU names where available.

    const NoColorSpace = '';

    const SRGBColorSpace = 'srgb';

    const LinearSRGBColorSpace = 'srgb-linear';

    const DisplayP3ColorSpace = 'display-p3';

    const LinearDisplayP3ColorSpace = 'display-p3-linear';


    const LinearTransfer = 'linear';

    const SRGBTransfer = 'srgb';


    const Rec709Primaries = 'rec709';

    const P3Primaries = 'p3';


    const ZeroStencilOp = 0;

    const KeepStencilOp = 7680;

    const ReplaceStencilOp = 7681;

    const IncrementStencilOp = 7682;

    const DecrementStencilOp = 7683;

    const IncrementWrapStencilOp = 34055;

    const DecrementWrapStencilOp = 34056;

    const InvertStencilOp = 5386;


    const NeverStencilFunc = 512;

    const LessStencilFunc = 513;

    const EqualStencilFunc = 514;

    const LessEqualStencilFunc = 515;

    const GreaterStencilFunc = 516;

    const NotEqualStencilFunc = 517;

    const GreaterEqualStencilFunc = 518;

    const AlwaysStencilFunc = 519;


    const NeverCompare = 512;

    const LessCompare = 513;

    const EqualCompare = 514;

    const LessEqualCompare = 515;

    const GreaterCompare = 516;

    const NotEqualCompare = 517;

    const GreaterEqualCompare = 518;

    const AlwaysCompare = 519;


    const StaticDrawUsage = 35044;

    const DynamicDrawUsage = 35048;

    const StreamDrawUsage = 35040;

    const StaticReadUsage = 35045;

    const DynamicReadUsage = 35049;

    const StreamReadUsage = 35041;

    const StaticCopyUsage = 35046;

    const DynamicCopyUsage = 35050;

    const StreamCopyUsage = 35042;


    const GLSL1 = '100';

    const GLSL3 = '300 es';


    const _SRGBAFormat = 1035; // fallback for WebGL 1


    const WebGLCoordinateSystem = 2000;

    const WebGPUCoordinateSystem = 2001;


    class EventDispatcher {


        addEventListener( type, listener ) {


            if ( this._listeners === undefined ) this._listeners = {};


            const listeners = this._listeners;


            if ( listeners[ type ] === undefined ) {


                listeners[ type ] = [];


            }


            if ( listeners[ type ].indexOf( listener ) === - 1 ) {


                listeners[ type ].push( listener );


            }


        }


        hasEventListener( type, listener ) {


            if ( this._listeners === undefined ) return false;


            const listeners = this._listeners;


            return listeners[ type ] !== undefined && listeners[ type ].indexOf( listener ) !== - 1;


        }


        removeEventListener( type, listener ) {


            if ( this._listeners === undefined ) return;


            const listeners = this._listeners;

            const listenerArray = listeners[ type ];


            if ( listenerArray !== undefined ) {


                const index = listenerArray.indexOf( listener );


                if ( index !== - 1 ) {


                    listenerArray.splice( index, 1 );


                }


            }


        }


        dispatchEvent( event ) {


            if ( this._listeners === undefined ) return;


            const listeners = this._listeners;

            const listenerArray = listeners[ event.type ];


            if ( listenerArray !== undefined ) {


                event.target = this;


                // Make a copy, in case listeners are removed while iterating.

                const array = listenerArray.slice( 0 );


                for ( let i = 0, l = array.length; i < l; i ++ ) {


                    array[ i ].call( this, event );


                }


                event.target = null;


            }


        }


    }


    const _lut = [ '00', '01', '02', '03', '04', '05', '06', '07', '08', '09', '0a', '0b', '0c', '0d', '0e', '0f', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '1a', '1b', '1c', '1d', '1e', '1f', '20', '21', '22', '23', '24', '25', '26', '27', '28', '29', '2a', '2b', '2c', '2d', '2e', '2f', '30', '31', '32', '33', '34', '35', '36', '37', '38', '39', '3a', '3b', '3c', '3d', '3e', '3f', '40', '41', '42', '43', '44', '45', '46', '47', '48', '49', '4a', '4b', '4c', '4d', '4e', '4f', '50', '51', '52', '53', '54', '55', '56', '57', '58', '59', '5a', '5b', '5c', '5d', '5e', '5f', '60', '61', '62', '63', '64', '65', '66', '67', '68', '69', '6a', '6b', '6c', '6d', '6e', '6f', '70', '71', '72', '73', '74', '75', '76', '77', '78', '79', '7a', '7b', '7c', '7d', '7e', '7f', '80', '81', '82', '83', '84', '85', '86', '87', '88', '89', '8a', '8b', '8c', '8d', '8e', '8f', '90', '91', '92', '93', '94', '95', '96', '97', '98', '99', '9a', '9b', '9c', '9d', '9e', '9f', 'a0', 'a1', 'a2', 'a3', 'a4', 'a5', 'a6', 'a7', 'a8', 'a9', 'aa', 'ab', 'ac', 'ad', 'ae', 'af', 'b0', 'b1', 'b2', 'b3', 'b4', 'b5', 'b6', 'b7', 'b8', 'b9', 'ba', 'bb', 'bc', 'bd', 'be', 'bf', 'c0', 'c1', 'c2', 'c3', 'c4', 'c5', 'c6', 'c7', 'c8', 'c9', 'ca', 'cb', 'cc', 'cd', 'ce', 'cf', 'd0', 'd1', 'd2', 'd3', 'd4', 'd5', 'd6', 'd7', 'd8', 'd9', 'da', 'db', 'dc', 'dd', 'de', 'df', 'e0', 'e1', 'e2', 'e3', 'e4', 'e5', 'e6', 'e7', 'e8', 'e9', 'ea', 'eb', 'ec', 'ed', 'ee', 'ef', 'f0', 'f1', 'f2', 'f3', 'f4', 'f5', 'f6', 'f7', 'f8', 'f9', 'fa', 'fb', 'fc', 'fd', 'fe', 'ff' ];


    let _seed = 1234567;


    const DEG2RAD = Math.PI / 180;

    const RAD2DEG = 180 / Math.PI;


    // http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript/21963136#21963136

    function generateUUID() {


        const d0 = Math.random() * 0xffffffff | 0;

        const d1 = Math.random() * 0xffffffff | 0;

        const d2 = Math.random() * 0xffffffff | 0;

        const d3 = Math.random() * 0xffffffff | 0;

        const uuid = _lut[ d0 & 0xff ] + _lut[ d0 >> 8 & 0xff ] + _lut[ d0 >> 16 & 0xff ] + _lut[ d0 >> 24 & 0xff ] + '-' +

                _lut[ d1 & 0xff ] + _lut[ d1 >> 8 & 0xff ] + '-' + _lut[ d1 >> 16 & 0x0f | 0x40 ] + _lut[ d1 >> 24 & 0xff ] + '-' +

                _lut[ d2 & 0x3f | 0x80 ] + _lut[ d2 >> 8 & 0xff ] + '-' + _lut[ d2 >> 16 & 0xff ] + _lut[ d2 >> 24 & 0xff ] +

                _lut[ d3 & 0xff ] + _lut[ d3 >> 8 & 0xff ] + _lut[ d3 >> 16 & 0xff ] + _lut[ d3 >> 24 & 0xff ];


        // .toLowerCase() here flattens concatenated strings to save heap memory space.

        return uuid.toLowerCase();


    }


    function clamp( value, min, max ) {


        return Math.max( min, Math.min( max, value ) );


    }


    // compute euclidean modulo of m % n

    // https://en.wikipedia.org/wiki/Modulo_operation

    function euclideanModulo( n, m ) {


        return ( ( n % m ) + m ) % m;


    }


    // Linear mapping from range <a1, a2> to range <b1, b2>

    function mapLinear( x, a1, a2, b1, b2 ) {


        return b1 + ( x - a1 ) * ( b2 - b1 ) / ( a2 - a1 );


    }


    // https://www.gamedev.net/tutorials/programming/general-and-gameplay-programming/inverse-lerp-a-super-useful-yet-often-overlooked-function-r5230/

    function inverseLerp( x, y, value ) {


        if ( x !== y ) {


            return ( value - x ) / ( y - x );


        } else {


            return 0;


        }


    }


    // https://en.wikipedia.org/wiki/Linear_interpolation

    function lerp( x, y, t ) {


        return ( 1 - t ) * x + t * y;


    }


    // http://www.rorydriscoll.com/2016/03/07/frame-rate-independent-damping-using-lerp/

    function damp( x, y, lambda, dt ) {


        return lerp( x, y, 1 - Math.exp( - lambda * dt ) );


    }


    // https://www.desmos.com/calculator/vcsjnyz7x4

    function pingpong( x, length = 1 ) {


        return length - Math.abs( euclideanModulo( x, length * 2 ) - length );


    }


    // http://en.wikipedia.org/wiki/Smoothstep

    function smoothstep( x, min, max ) {


        if ( x <= min ) return 0;

        if ( x >= max ) return 1;


        x = ( x - min ) / ( max - min );


        return x * x * ( 3 - 2 * x );


    }


    function smootherstep( x, min, max ) {


        if ( x <= min ) return 0;

        if ( x >= max ) return 1;


        x = ( x - min ) / ( max - min );


        return x * x * x * ( x * ( x * 6 - 15 ) + 10 );


    }


    // Random integer from <low, high> interval

    function randInt( low, high ) {


        return low + Math.floor( Math.random() * ( high - low + 1 ) );


    }


    // Random float from <low, high> interval

    function randFloat( low, high ) {


        return low + Math.random() * ( high - low );


    }


    // Random float from <-range/2, range/2> interval

    function randFloatSpread( range ) {


        return range * ( 0.5 - Math.random() );


    }


    // Deterministic pseudo-random float in the interval [ 0, 1 ]

    function seededRandom( s ) {


        if ( s !== undefined ) _seed = s;


        // Mulberry32 generator


        let t = _seed += 0x6D2B79F5;


        t = Math.imul( t ^ t >>> 15, t | 1 );


        t ^= t + Math.imul( t ^ t >>> 7, t | 61 );


        return ( ( t ^ t >>> 14 ) >>> 0 ) / 4294967296;


    }


    function degToRad( degrees ) {


        return degrees * DEG2RAD;


    }


    function radToDeg( radians ) {


        return radians * RAD2DEG;


    }


    function isPowerOfTwo( value ) {


        return ( value & ( value - 1 ) ) === 0 && value !== 0;


    }


    function ceilPowerOfTwo( value ) {


        return Math.pow( 2, Math.ceil( Math.log( value ) / Math.LN2 ) );


    }


    function floorPowerOfTwo( value ) {


        return Math.pow( 2, Math.floor( Math.log( value ) / Math.LN2 ) );


    }


    function setQuaternionFromProperEuler( q, a, b, c, order ) {


        // Intrinsic Proper Euler Angles - see https://en.wikipedia.org/wiki/Euler_angles


        // rotations are applied to the axes in the order specified by 'order'

        // rotation by angle 'a' is applied first, then by angle 'b', then by angle 'c'

        // angles are in radians


        const cos = Math.cos;

        const sin = Math.sin;


        const c2 = cos( b / 2 );

        const s2 = sin( b / 2 );


        const c13 = cos( ( a + c ) / 2 );

        const s13 = sin( ( a + c ) / 2 );


        const c1_3 = cos( ( a - c ) / 2 );

        const s1_3 = sin( ( a - c ) / 2 );


        const c3_1 = cos( ( c - a ) / 2 );

        const s3_1 = sin( ( c - a ) / 2 );


        switch ( order ) {


            case 'XYX':

                q.set( c2 * s13, s2 * c1_3, s2 * s1_3, c2 * c13 );

                break;


            case 'YZY':

                q.set( s2 * s1_3, c2 * s13, s2 * c1_3, c2 * c13 );

                break;


            case 'ZXZ':

                q.set( s2 * c1_3, s2 * s1_3, c2 * s13, c2 * c13 );

                break;


            case 'XZX':

                q.set( c2 * s13, s2 * s3_1, s2 * c3_1, c2 * c13 );

                break;


            case 'YXY':

                q.set( s2 * c3_1, c2 * s13, s2 * s3_1, c2 * c13 );

                break;


            case 'ZYZ':

                q.set( s2 * s3_1, s2 * c3_1, c2 * s13, c2 * c13 );

                break;


            default:

                console.warn( 'THREE.MathUtils: .setQuaternionFromProperEuler() encountered an unknown order: ' + order );


        }


    }


    function denormalize( value, array ) {


        switch ( array.constructor ) {


            case Float32Array:


                return value;


            case Uint32Array:


                return value / 4294967295.0;


            case Uint16Array:


                return value / 65535.0;


            case Uint8Array:


                return value / 255.0;


            case Int32Array:


                return Math.max( value / 2147483647.0, - 1.0 );


            case Int16Array:


                return Math.max( value / 32767.0, - 1.0 );


            case Int8Array:


                return Math.max( value / 127.0, - 1.0 );


            default:


                throw new Error( 'Invalid component type.' );


        }


    }


    function normalize( value, array ) {


        switch ( array.constructor ) {


            case Float32Array:


                return value;


            case Uint32Array:


                return Math.round( value * 4294967295.0 );


            case Uint16Array:


                return Math.round( value * 65535.0 );


            case Uint8Array:


                return Math.round( value * 255.0 );


            case Int32Array:


                return Math.round( value * 2147483647.0 );


            case Int16Array:


                return Math.round( value * 32767.0 );


            case Int8Array:


                return Math.round( value * 127.0 );


            default:


                throw new Error( 'Invalid component type.' );


        }


    }


    const MathUtils = {

        DEG2RAD: DEG2RAD,

        RAD2DEG: RAD2DEG,

        generateUUID: generateUUID,

        clamp: clamp,

        euclideanModulo: euclideanModulo,

        mapLinear: mapLinear,

        inverseLerp: inverseLerp,

        lerp: lerp,

        damp: damp,

        pingpong: pingpong,

        smoothstep: smoothstep,

        smootherstep: smootherstep,

        randInt: randInt,

        randFloat: randFloat,

        randFloatSpread: randFloatSpread,

        seededRandom: seededRandom,

        degToRad: degToRad,

        radToDeg: radToDeg,

        isPowerOfTwo: isPowerOfTwo,

        ceilPowerOfTwo: ceilPowerOfTwo,

        floorPowerOfTwo: floorPowerOfTwo,

        setQuaternionFromProperEuler: setQuaternionFromProperEuler,

        normalize: normalize,

        denormalize: denormalize

    };


    class Vector2 {


        constructor( x = 0, y = 0 ) {


            Vector2.prototype.isVector2 = true;


            this.x = x;

            this.y = y;


        }


        get width() {


            return this.x;


        }


        set width( value ) {


            this.x = value;


        }


        get height() {


            return this.y;


        }


        set height( value ) {


            this.y = value;


        }


        set( x, y ) {


            this.x = x;

            this.y = y;


            return this;


        }


        setScalar( scalar ) {


            this.x = scalar;

            this.y = scalar;


            return this;


        }


        setX( x ) {


            this.x = x;


            return this;


        }


        setY( y ) {


            this.y = y;


            return this;


        }


        setComponent( index, value ) {


            switch ( index ) {


                case 0: this.x = value; break;

                case 1: this.y = value; break;

                default: throw new Error( 'index is out of range: ' + index );


            }


            return this;


        }


        getComponent( index ) {


            switch ( index ) {


                case 0: return this.x;

                case 1: return this.y;

                default: throw new Error( 'index is out of range: ' + index );


            }


        }


        clone() {


            return new this.constructor( this.x, this.y );


        }


        copy( v ) {


            this.x = v.x;

            this.y = v.y;


            return this;


        }


        add( v ) {


            this.x += v.x;

            this.y += v.y;


            return this;


        }


        addScalar( s ) {


            this.x += s;

            this.y += s;


            return this;


        }


        addVectors( a, b ) {


            this.x = a.x + b.x;

            this.y = a.y + b.y;


            return this;


        }


        addScaledVector( v, s ) {


            this.x += v.x * s;

            this.y += v.y * s;


            return this;


        }


        sub( v ) {


            this.x -= v.x;

            this.y -= v.y;


            return this;


        }


        subScalar( s ) {


            this.x -= s;

            this.y -= s;


            return this;


        }


        subVectors( a, b ) {


            this.x = a.x - b.x;

            this.y = a.y - b.y;


            return this;


        }


        multiply( v ) {


            this.x *= v.x;

            this.y *= v.y;


            return this;


        }


        multiplyScalar( scalar ) {


            this.x *= scalar;

            this.y *= scalar;


            return this;


        }


        divide( v ) {


            this.x /= v.x;

            this.y /= v.y;


            return this;


        }


        divideScalar( scalar ) {


            return this.multiplyScalar( 1 / scalar );


        }


        applyMatrix3( m ) {


            const x = this.x, y = this.y;

            const e = m.elements;


            this.x = e[ 0 ] * x + e[ 3 ] * y + e[ 6 ];

            this.y = e[ 1 ] * x + e[ 4 ] * y + e[ 7 ];


            return this;


        }


        min( v ) {


            this.x = Math.min( this.x, v.x );

            this.y = Math.min( this.y, v.y );


            return this;


        }


        max( v ) {


            this.x = Math.max( this.x, v.x );

            this.y = Math.max( this.y, v.y );


            return this;


        }


        clamp( min, max ) {


            // assumes min < max, componentwise


            this.x = Math.max( min.x, Math.min( max.x, this.x ) );

            this.y = Math.max( min.y, Math.min( max.y, this.y ) );


            return this;


        }


        clampScalar( minVal, maxVal ) {


            this.x = Math.max( minVal, Math.min( maxVal, this.x ) );

            this.y = Math.max( minVal, Math.min( maxVal, this.y ) );


            return this;


        }


        clampLength( min, max ) {


            const length = this.length();


            return this.divideScalar( length || 1 ).multiplyScalar( Math.max( min, Math.min( max, length ) ) );


        }


        floor() {


            this.x = Math.floor( this.x );

            this.y = Math.floor( this.y );


            return this;


        }


        ceil() {


            this.x = Math.ceil( this.x );

            this.y = Math.ceil( this.y );


            return this;


        }


        round() {


            this.x = Math.round( this.x );

            this.y = Math.round( this.y );


            return this;


        }


        roundToZero() {


            this.x = Math.trunc( this.x );

            this.y = Math.trunc( this.y );


            return this;


        }


        negate() {


            this.x = - this.x;

            this.y = - this.y;


            return this;


        }


        dot( v ) {


            return this.x * v.x + this.y * v.y;


        }


        cross( v ) {


            return this.x * v.y - this.y * v.x;


        }


        lengthSq() {


            return this.x * this.x + this.y * this.y;


        }


        length() {


            return Math.sqrt( this.x * this.x + this.y * this.y );


        }


        manhattanLength() {


            return Math.abs( this.x ) + Math.abs( this.y );


        }


        normalize() {


            return this.divideScalar( this.length() || 1 );


        }


        angle() {


            // computes the angle in radians with respect to the positive x-axis


            const angle = Math.atan2( - this.y, - this.x ) + Math.PI;


            return angle;


        }


        angleTo( v ) {


            const denominator = Math.sqrt( this.lengthSq() * v.lengthSq() );


            if ( denominator === 0 ) return Math.PI / 2;


            const theta = this.dot( v ) / denominator;


            // clamp, to handle numerical problems


            return Math.acos( clamp( theta, - 1, 1 ) );


        }


        distanceTo( v ) {


            return Math.sqrt( this.distanceToSquared( v ) );


        }


        distanceToSquared( v ) {


            const dx = this.x - v.x, dy = this.y - v.y;

            return dx * dx + dy * dy;


        }


        manhattanDistanceTo( v ) {


            return Math.abs( this.x - v.x ) + Math.abs( this.y - v.y );


        }


        setLength( length ) {


            return this.normalize().multiplyScalar( length );


        }


        lerp( v, alpha ) {


            this.x += ( v.x - this.x ) * alpha;

            this.y += ( v.y - this.y ) * alpha;


            return this;


        }


        lerpVectors( v1, v2, alpha ) {


            this.x = v1.x + ( v2.x - v1.x ) * alpha;

            this.y = v1.y + ( v2.y - v1.y ) * alpha;


            return this;


        }


        equals( v ) {


            return ( ( v.x === this.x ) && ( v.y === this.y ) );


        }


        fromArray( array, offset = 0 ) {


            this.x = array[ offset ];

            this.y = array[ offset + 1 ];


            return this;


        }


        toArray( array = [], offset = 0 ) {


            array[ offset ] = this.x;

            array[ offset + 1 ] = this.y;


            return array;


        }


        fromBufferAttribute( attribute, index ) {


            this.x = attribute.getX( index );

            this.y = attribute.getY( index );


            return this;


        }


        rotateAround( center, angle ) {


            const c = Math.cos( angle ), s = Math.sin( angle );


            const x = this.x - center.x;

            const y = this.y - center.y;


            this.x = x * c - y * s + center.x;

            this.y = x * s + y * c + center.y;


            return this;


        }


        random() {


            this.x = Math.random();

            this.y = Math.random();


            return this;


        }


        *[ Symbol.iterator ]() {


            yield this.x;

            yield this.y;


        }


    }


    class Matrix3 {


        constructor( n11, n12, n13, n21, n22, n23, n31, n32, n33 ) {


            Matrix3.prototype.isMatrix3 = true;


            this.elements = [


                1, 0, 0,

                0, 1, 0,

                0, 0, 1


            ];


            if ( n11 !== undefined ) {


                this.set( n11, n12, n13, n21, n22, n23, n31, n32, n33 );


            }


        }


        set( n11, n12, n13, n21, n22, n23, n31, n32, n33 ) {


            const te = this.elements;


            te[ 0 ] = n11; te[ 1 ] = n21; te[ 2 ] = n31;

            te[ 3 ] = n12; te[ 4 ] = n22; te[ 5 ] = n32;

            te[ 6 ] = n13; te[ 7 ] = n23; te[ 8 ] = n33;


            return this;


        }


        identity() {


            this.set(


                1, 0, 0,

                0, 1, 0,

                0, 0, 1


            );


            return this;


        }


        copy( m ) {


            const te = this.elements;

            const me = m.elements;


            te[ 0 ] = me[ 0 ]; te[ 1 ] = me[ 1 ]; te[ 2 ] = me[ 2 ];

            te[ 3 ] = me[ 3 ]; te[ 4 ] = me[ 4 ]; te[ 5 ] = me[ 5 ];

            te[ 6 ] = me[ 6 ]; te[ 7 ] = me[ 7 ]; te[ 8 ] = me[ 8 ];


            return this;


        }


        extractBasis( xAxis, yAxis, zAxis ) {


            xAxis.setFromMatrix3Column( this, 0 );

            yAxis.setFromMatrix3Column( this, 1 );

            zAxis.setFromMatrix3Column( this, 2 );


            return this;


        }


        setFromMatrix4( m ) {


            const me = m.elements;


            this.set(


                me[ 0 ], me[ 4 ], me[ 8 ],

                me[ 1 ], me[ 5 ], me[ 9 ],

                me[ 2 ], me[ 6 ], me[ 10 ]


            );


            return this;


        }


        multiply( m ) {


            return this.multiplyMatrices( this, m );


        }


        premultiply( m ) {


            return this.multiplyMatrices( m, this );


        }


        multiplyMatrices( a, b ) {


            const ae = a.elements;

            const be = b.elements;

            const te = this.elements;


            const a11 = ae[ 0 ], a12 = ae[ 3 ], a13 = ae[ 6 ];

            const a21 = ae[ 1 ], a22 = ae[ 4 ], a23 = ae[ 7 ];

            const a31 = ae[ 2 ], a32 = ae[ 5 ], a33 = ae[ 8 ];


            const b11 = be[ 0 ], b12 = be[ 3 ], b13 = be[ 6 ];

            const b21 = be[ 1 ], b22 = be[ 4 ], b23 = be[ 7 ];

            const b31 = be[ 2 ], b32 = be[ 5 ], b33 = be[ 8 ];


            te[ 0 ] = a11 * b11 + a12 * b21 + a13 * b31;

            te[ 3 ] = a11 * b12 + a12 * b22 + a13 * b32;

            te[ 6 ] = a11 * b13 + a12 * b23 + a13 * b33;


            te[ 1 ] = a21 * b11 + a22 * b21 + a23 * b31;

            te[ 4 ] = a21 * b12 + a22 * b22 + a23 * b32;

            te[ 7 ] = a21 * b13 + a22 * b23 + a23 * b33;


            te[ 2 ] = a31 * b11 + a32 * b21 + a33 * b31;

            te[ 5 ] = a31 * b12 + a32 * b22 + a33 * b32;

            te[ 8 ] = a31 * b13 + a32 * b23 + a33 * b33;


            return this;


        }


        multiplyScalar( s ) {


            const te = this.elements;


            te[ 0 ] *= s; te[ 3 ] *= s; te[ 6 ] *= s;

            te[ 1 ] *= s; te[ 4 ] *= s; te[ 7 ] *= s;

            te[ 2 ] *= s; te[ 5 ] *= s; te[ 8 ] *= s;


            return this;


        }


        determinant() {


            const te = this.elements;


            const a = te[ 0 ], b = te[ 1 ], c = te[ 2 ],

                d = te[ 3 ], e = te[ 4 ], f = te[ 5 ],

                g = te[ 6 ], h = te[ 7 ], i = te[ 8 ];


            return a * e * i - a * f * h - b * d * i + b * f * g + c * d * h - c * e * g;


        }


        invert() {


            const te = this.elements,


                n11 = te[ 0 ], n21 = te[ 1 ], n31 = te[ 2 ],

                n12 = te[ 3 ], n22 = te[ 4 ], n32 = te[ 5 ],

                n13 = te[ 6 ], n23 = te[ 7 ], n33 = te[ 8 ],


                t11 = n33 * n22 - n32 * n23,

                t12 = n32 * n13 - n33 * n12,

                t13 = n23 * n12 - n22 * n13,


                det = n11 * t11 + n21 * t12 + n31 * t13;


            if ( det === 0 ) return this.set( 0, 0, 0, 0, 0, 0, 0, 0, 0 );


            const detInv = 1 / det;


            te[ 0 ] = t11 * detInv;

            te[ 1 ] = ( n31 * n23 - n33 * n21 ) * detInv;

            te[ 2 ] = ( n32 * n21 - n31 * n22 ) * detInv;


            te[ 3 ] = t12 * detInv;

            te[ 4 ] = ( n33 * n11 - n31 * n13 ) * detInv;

            te[ 5 ] = ( n31 * n12 - n32 * n11 ) * detInv;


            te[ 6 ] = t13 * detInv;

            te[ 7 ] = ( n21 * n13 - n23 * n11 ) * detInv;

            te[ 8 ] = ( n22 * n11 - n21 * n12 ) * detInv;


            return this;


        }


        transpose() {


            let tmp;

            const m = this.elements;


            tmp = m[ 1 ]; m[ 1 ] = m[ 3 ]; m[ 3 ] = tmp;

            tmp = m[ 2 ]; m[ 2 ] = m[ 6 ]; m[ 6 ] = tmp;

            tmp = m[ 5 ]; m[ 5 ] = m[ 7 ]; m[ 7 ] = tmp;


            return this;


        }


        getNormalMatrix( matrix4 ) {


            return this.setFromMatrix4( matrix4 ).invert().transpose();


        }


        transposeIntoArray( r ) {


            const m = this.elements;


            r[ 0 ] = m[ 0 ];

            r[ 1 ] = m[ 3 ];

            r[ 2 ] = m[ 6 ];

            r[ 3 ] = m[ 1 ];

            r[ 4 ] = m[ 4 ];

            r[ 5 ] = m[ 7 ];

            r[ 6 ] = m[ 2 ];

            r[ 7 ] = m[ 5 ];

            r[ 8 ] = m[ 8 ];


            return this;


        }


        setUvTransform( tx, ty, sx, sy, rotation, cx, cy ) {


            const c = Math.cos( rotation );

            const s = Math.sin( rotation );


            this.set(

                sx * c, sx * s, - sx * ( c * cx + s * cy ) + cx + tx,

                - sy * s, sy * c, - sy * ( - s * cx + c * cy ) + cy + ty,

                0, 0, 1

            );


            return this;


        }


        //


        scale( sx, sy ) {


            this.premultiply( _m3.makeScale( sx, sy ) );


            return this;


        }


        rotate( theta ) {


            this.premultiply( _m3.makeRotation( - theta ) );


            return this;


        }


        translate( tx, ty ) {


            this.premultiply( _m3.makeTranslation( tx, ty ) );


            return this;


        }


        // for 2D Transforms


        makeTranslation( x, y ) {


            if ( x.isVector2 ) {


                this.set(


                    1, 0, x.x,

                    0, 1, x.y,

                    0, 0, 1


                );


            } else {


                this.set(


                    1, 0, x,

                    0, 1, y,

                    0, 0, 1


                );


            }


            return this;


        }


        makeRotation( theta ) {


            // counterclockwise


            const c = Math.cos( theta );

            const s = Math.sin( theta );


            this.set(


                c, - s, 0,

                s, c, 0,

                0, 0, 1


            );


            return this;


        }


        makeScale( x, y ) {


            this.set(


                x, 0, 0,

                0, y, 0,

                0, 0, 1


            );


            return this;


        }


        //


        equals( matrix ) {


            const te = this.elements;

            const me = matrix.elements;


            for ( let i = 0; i < 9; i ++ ) {


                if ( te[ i ] !== me[ i ] ) return false;


            }


            return true;


        }


        fromArray( array, offset = 0 ) {


            for ( let i = 0; i < 9; i ++ ) {


                this.elements[ i ] = array[ i + offset ];


            }


            return this;


        }


        toArray( array = [], offset = 0 ) {


            const te = this.elements;


            array[ offset ] = te[ 0 ];

            array[ offset + 1 ] = te[ 1 ];

            array[ offset + 2 ] = te[ 2 ];


            array[ offset + 3 ] = te[ 3 ];

            array[ offset + 4 ] = te[ 4 ];

            array[ offset + 5 ] = te[ 5 ];


            array[ offset + 6 ] = te[ 6 ];

            array[ offset + 7 ] = te[ 7 ];

            array[ offset + 8 ] = te[ 8 ];


            return array;


        }


        clone() {


            return new this.constructor().fromArray( this.elements );


        }


    }


    const _m3 = /*@__PURE__*/ new Matrix3();


    function arrayNeedsUint32( array ) {


        // assumes larger values usually on last


        for ( let i = array.length - 1; i >= 0; -- i ) {


            if ( array[ i ] >= 65535 ) return true; // account for PRIMITIVE_RESTART_FIXED_INDEX, #24565


        }


        return false;


    }


    const TYPED_ARRAYS = {

        Int8Array: Int8Array,

        Uint8Array: Uint8Array,

        Uint8ClampedArray: Uint8ClampedArray,

        Int16Array: Int16Array,

        Uint16Array: Uint16Array,

        Int32Array: Int32Array,

        Uint32Array: Uint32Array,

        Float32Array: Float32Array,

        Float64Array: Float64Array

    };


    function getTypedArray( type, buffer ) {


        return new TYPED_ARRAYS[ type ]( buffer );


    }


    function createElementNS( name ) {


        return document.createElementNS( 'http://www.w3.org/1999/xhtml', name );


    }


    function createCanvasElement() {


        const canvas = createElementNS( 'canvas' );

        canvas.style.display = 'block';

        return canvas;


    }


    const _cache = {};


    function warnOnce( message ) {


        if ( message in _cache ) return;


        _cache[ message ] = true;


        console.warn( message );


    }


    const LINEAR_SRGB_TO_LINEAR_DISPLAY_P3 = /*@__PURE__*/ new Matrix3().set(

        0.8224621, 0.177538, 0.0,

        0.0331941, 0.9668058, 0.0,

        0.0170827, 0.0723974, 0.9105199,

    );


    const LINEAR_DISPLAY_P3_TO_LINEAR_SRGB = /*@__PURE__*/ new Matrix3().set(

        1.2249401, - 0.2249404, 0.0,

        - 0.0420569, 1.0420571, 0.0,

        - 0.0196376, - 0.0786361, 1.0982735

    );


    const COLOR_SPACES = {

        [ LinearSRGBColorSpace ]: {

            transfer: LinearTransfer,

            primaries: Rec709Primaries,

            toReference: ( color ) => color,

            fromReference: ( color ) => color,

        },

        [ SRGBColorSpace ]: {

            transfer: SRGBTransfer,

            primaries: Rec709Primaries,

            toReference: ( color ) => color.convertSRGBToLinear(),

            fromReference: ( color ) => color.convertLinearToSRGB(),

        },

        [ LinearDisplayP3ColorSpace ]: {

            transfer: LinearTransfer,

            primaries: P3Primaries,

            toReference: ( color ) => color.applyMatrix3( LINEAR_DISPLAY_P3_TO_LINEAR_SRGB ),

            fromReference: ( color ) => color.applyMatrix3( LINEAR_SRGB_TO_LINEAR_DISPLAY_P3 ),

        },

        [ DisplayP3ColorSpace ]: {

            transfer: SRGBTransfer,

            primaries: P3Primaries,

            toReference: ( color ) => color.convertSRGBToLinear().applyMatrix3( LINEAR_DISPLAY_P3_TO_LINEAR_SRGB ),

            fromReference: ( color ) => color.applyMatrix3( LINEAR_SRGB_TO_LINEAR_DISPLAY_P3 ).convertLinearToSRGB(),

        },

    };


    const SUPPORTED_WORKING_COLOR_SPACES = new Set( [ LinearSRGBColorSpace, LinearDisplayP3ColorSpace ] );


    const ColorManagement = {


        enabled: true,


        _workingColorSpace: LinearSRGBColorSpace,


        get workingColorSpace() {


            return this._workingColorSpace;


        },


        set workingColorSpace( colorSpace ) {


            if ( ! SUPPORTED_WORKING_COLOR_SPACES.has( colorSpace ) ) {


                throw new Error( `Unsupported working color space, "${ colorSpace }".` );


            }


            this._workingColorSpace = colorSpace;


        },


        convert: function ( color, sourceColorSpace, targetColorSpace ) {


            if ( this.enabled === false || sourceColorSpace === targetColorSpace || ! sourceColorSpace || ! targetColorSpace ) {


                return color;


            }


            const sourceToReference = COLOR_SPACES[ sourceColorSpace ].toReference;

            const targetFromReference = COLOR_SPACES[ targetColorSpace ].fromReference;


            return targetFromReference( sourceToReference( color ) );


        },


        fromWorkingColorSpace: function ( color, targetColorSpace ) {


            return this.convert( color, this._workingColorSpace, targetColorSpace );


        },


        toWorkingColorSpace: function ( color, sourceColorSpace ) {


            return this.convert( color, sourceColorSpace, this._workingColorSpace );


        },


        getPrimaries: function ( colorSpace ) {


            return COLOR_SPACES[ colorSpace ].primaries;


        },


        getTransfer: function ( colorSpace ) {


            if ( colorSpace === NoColorSpace ) return LinearTransfer;


            return COLOR_SPACES[ colorSpace ].transfer;


        },


    };


    function SRGBToLinear( c ) {


        return ( c < 0.04045 ) ? c * 0.0773993808 : Math.pow( c * 0.9478672986 + 0.0521327014, 2.4 );


    }


    function LinearToSRGB( c ) {


        return ( c < 0.0031308 ) ? c * 12.92 : 1.055 * ( Math.pow( c, 0.41666 ) ) - 0.055;


    }


    let _canvas;


    class ImageUtils {


        static getDataURL( image ) {


            if ( /^data:/i.test( image.src ) ) {


                return image.src;


            }


            if ( typeof HTMLCanvasElement === 'undefined' ) {


                return image.src;


            }


            let canvas;


            if ( image instanceof HTMLCanvasElement ) {


                canvas = image;


            } else {


                if ( _canvas === undefined ) _canvas = createElementNS( 'canvas' );


                _canvas.width = image.width;

                _canvas.height = image.height;


                const context = _canvas.getContext( '2d' );


                if ( image instanceof ImageData ) {


                    context.putImageData( image, 0, 0 );


                } else {


                    context.drawImage( image, 0, 0, image.width, image.height );


                }


                canvas = _canvas;


            }


            if ( canvas.width > 2048 || canvas.height > 2048 ) {


                console.warn( 'THREE.ImageUtils.getDataURL: Image converted to jpg for performance reasons', image );


                return canvas.toDataURL( 'image/jpeg', 0.6 );


            } else {


                return canvas.toDataURL( 'image/png' );


            }


        }


        static sRGBToLinear( image ) {


            if ( ( typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement ) ||

                ( typeof HTMLCanvasElement !== 'undefined' && image instanceof HTMLCanvasElement ) ||

                ( typeof ImageBitmap !== 'undefined' && image instanceof ImageBitmap ) ) {


                const canvas = createElementNS( 'canvas' );


                canvas.width = image.width;

                canvas.height = image.height;


                const context = canvas.getContext( '2d' );

                context.drawImage( image, 0, 0, image.width, image.height );


                const imageData = context.getImageData( 0, 0, image.width, image.height );

                const data = imageData.data;


                for ( let i = 0; i < data.length; i ++ ) {


                    data[ i ] = SRGBToLinear( data[ i ] / 255 ) * 255;


                }


                context.putImageData( imageData, 0, 0 );


                return canvas;


            } else if ( image.data ) {


                const data = image.data.slice( 0 );


                for ( let i = 0; i < data.length; i ++ ) {


                    if ( data instanceof Uint8Array || data instanceof Uint8ClampedArray ) {


                        data[ i ] = Math.floor( SRGBToLinear( data[ i ] / 255 ) * 255 );


                    } else {


                        // assuming float


                        data[ i ] = SRGBToLinear( data[ i ] );


                    }


                }


                return {

                    data: data,

                    width: image.width,

                    height: image.height

                };


            } else {


                console.warn( 'THREE.ImageUtils.sRGBToLinear(): Unsupported image type. No color space conversion applied.' );

                return image;


            }


        }


    }


    let _sourceId = 0;


    class Source {


        constructor( data = null ) {


            this.isSource = true;


            Object.defineProperty( this, 'id', { value: _sourceId ++ } );


            this.uuid = generateUUID();


            this.data = data;


            this.version = 0;


        }


        set needsUpdate( value ) {


            if ( value === true ) this.version ++;


        }


        toJSON( meta ) {


            const isRootObject = ( meta === undefined || typeof meta === 'string' );


            if ( ! isRootObject && meta.images[ this.uuid ] !== undefined ) {


                return meta.images[ this.uuid ];


            }


            const output = {

                uuid: this.uuid,

                url: ''

            };


            const data = this.data;


            if ( data !== null ) {


                let url;


                if ( Array.isArray( data ) ) {


                    // cube texture


                    url = [];


                    for ( let i = 0, l = data.length; i < l; i ++ ) {


                        if ( data[ i ].isDataTexture ) {


                            url.push( serializeImage( data[ i ].image ) );


                        } else {


                            url.push( serializeImage( data[ i ] ) );


                        }


                    }


                } else {


                    // texture


                    url = serializeImage( data );


                }


                output.url = url;


            }


            if ( ! isRootObject ) {


                meta.images[ this.uuid ] = output;


            }


            return output;


        }


    }


    function serializeImage( image ) {


        if ( ( typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement ) ||

            ( typeof HTMLCanvasElement !== 'undefined' && image instanceof HTMLCanvasElement ) ||

            ( typeof ImageBitmap !== 'undefined' && image instanceof ImageBitmap ) ) {


            // default images


            return ImageUtils.getDataURL( image );


        } else {


            if ( image.data ) {


                // images of DataTexture


                return {

                    data: Array.from( image.data ),

                    width: image.width,

                    height: image.height,

                    type: image.data.constructor.name

                };


            } else {


                console.warn( 'THREE.Texture: Unable to serialize Texture.' );

                return {};


            }


        }


    }


    let _textureId = 0;


    class Texture extends EventDispatcher {


        constructor( image = Texture.DEFAULT_IMAGE, mapping = Texture.DEFAULT_MAPPING, wrapS = ClampToEdgeWrapping, wrapT = ClampToEdgeWrapping, magFilter = LinearFilter, minFilter = LinearMipmapLinearFilter, format = RGBAFormat, type = UnsignedByteType, anisotropy = Texture.DEFAULT_ANISOTROPY, colorSpace = NoColorSpace ) {


            super();


            this.isTexture = true;


            Object.defineProperty( this, 'id', { value: _textureId ++ } );


            this.uuid = generateUUID();


            this.name = '';


            this.source = new Source( image );

            this.mipmaps = [];


            this.mapping = mapping;

            this.channel = 0;


            this.wrapS = wrapS;

            this.wrapT = wrapT;


            this.magFilter = magFilter;

            this.minFilter = minFilter;


            this.anisotropy = anisotropy;


            this.format = format;

            this.internalFormat = null;

            this.type = type;


            this.offset = new Vector2( 0, 0 );

            this.repeat = new Vector2( 1, 1 );

            this.center = new Vector2( 0, 0 );

            this.rotation = 0;


            this.matrixAutoUpdate = true;

            this.matrix = new Matrix3();


            this.generateMipmaps = true;

            this.premultiplyAlpha = false;

            this.flipY = true;

            this.unpackAlignment = 4;   // valid values: 1, 2, 4, 8 (see http://www.khronos.org/opengles/sdk/docs/man/xhtml/glPixelStorei.xml)


            if ( typeof colorSpace === 'string' ) {


                this.colorSpace = colorSpace;


            } else { // @deprecated, r152


                warnOnce( 'THREE.Texture: Property .encoding has been replaced by .colorSpace.' );

                this.colorSpace = colorSpace === sRGBEncoding ? SRGBColorSpace : NoColorSpace;


            }


            this.userData = {};


            this.version = 0;

            this.onUpdate = null;


            this.isRenderTargetTexture = false; // indicates whether a texture belongs to a render target or not

            this.needsPMREMUpdate = false; // indicates whether this texture should be processed by PMREMGenerator or not (only relevant for render target textures)


        }


        get image() {


            return this.source.data;


        }


        set image( value = null ) {


            this.source.data = value;


        }


        updateMatrix() {


            this.matrix.setUvTransform( this.offset.x, this.offset.y, this.repeat.x, this.repeat.y, this.rotation, this.center.x, this.center.y );


        }


        clone() {


            return new this.constructor().copy( this );


        }


        copy( source ) {


            this.name = source.name;


            this.source = source.source;

            this.mipmaps = source.mipmaps.slice( 0 );


            this.mapping = source.mapping;

            this.channel = source.channel;


            this.wrapS = source.wrapS;

            this.wrapT = source.wrapT;


            this.magFilter = source.magFilter;

            this.minFilter = source.minFilter;


            this.anisotropy = source.anisotropy;


            this.format = source.format;

            this.internalFormat = source.internalFormat;

            this.type = source.type;


            this.offset.copy( source.offset );

            this.repeat.copy( source.repeat );

            this.center.copy( source.center );

            this.rotation = source.rotation;


            this.matrixAutoUpdate = source.matrixAutoUpdate;

            this.matrix.copy( source.matrix );


            this.generateMipmaps = source.generateMipmaps;

            this.premultiplyAlpha = source.premultiplyAlpha;

            this.flipY = source.flipY;

            this.unpackAlignment = source.unpackAlignment;

            this.colorSpace = source.colorSpace;


            this.userData = JSON.parse( JSON.stringify( source.userData ) );


            this.needsUpdate = true;


            return this;


        }


        toJSON( meta ) {


            const isRootObject = ( meta === undefined || typeof meta === 'string' );


            if ( ! isRootObject && meta.textures[ this.uuid ] !== undefined ) {


                return meta.textures[ this.uuid ];


            }


            const output = {


                metadata: {

                    version: 4.6,

                    type: 'Texture',

                    generator: 'Texture.toJSON'

                },


                uuid: this.uuid,

                name: this.name,


                image: this.source.toJSON( meta ).uuid,


                mapping: this.mapping,

                channel: this.channel,


                repeat: [ this.repeat.x, this.repeat.y ],

                offset: [ this.offset.x, this.offset.y ],

                center: [ this.center.x, this.center.y ],

                rotation: this.rotation,


                wrap: [ this.wrapS, this.wrapT ],


                format: this.format,

                internalFormat: this.internalFormat,

                type: this.type,

                colorSpace: this.colorSpace,


                minFilter: this.minFilter,

                magFilter: this.magFilter,

                anisotropy: this.anisotropy,


                flipY: this.flipY,


                generateMipmaps: this.generateMipmaps,

                premultiplyAlpha: this.premultiplyAlpha,

                unpackAlignment: this.unpackAlignment


            };


            if ( Object.keys( this.userData ).length > 0 ) output.userData = this.userData;


            if ( ! isRootObject ) {


                meta.textures[ this.uuid ] = output;


            }


            return output;


        }


        dispose() {


            this.dispatchEvent( { type: 'dispose' } );


        }


        transformUv( uv ) {


            if ( this.mapping !== UVMapping ) return uv;


            uv.applyMatrix3( this.matrix );


            if ( uv.x < 0 || uv.x > 1 ) {


                switch ( this.wrapS ) {


                    case RepeatWrapping:


                        uv.x = uv.x - Math.floor( uv.x );

                        break;


                    case ClampToEdgeWrapping:


                        uv.x = uv.x < 0 ? 0 : 1;

                        break;


                    case MirroredRepeatWrapping:


                        if ( Math.abs( Math.floor( uv.x ) % 2 ) === 1 ) {


                            uv.x = Math.ceil( uv.x ) - uv.x;


                        } else {


                            uv.x = uv.x - Math.floor( uv.x );


                        }


                        break;


                }


            }


            if ( uv.y < 0 || uv.y > 1 ) {


                switch ( this.wrapT ) {


                    case RepeatWrapping:


                        uv.y = uv.y - Math.floor( uv.y );

                        break;


                    case ClampToEdgeWrapping:


                        uv.y = uv.y < 0 ? 0 : 1;

                        break;


                    case MirroredRepeatWrapping:


                        if ( Math.abs( Math.floor( uv.y ) % 2 ) === 1 ) {


                            uv.y = Math.ceil( uv.y ) - uv.y;


                        } else {


                            uv.y = uv.y - Math.floor( uv.y );


                        }


                        break;


                }


            }


            if ( this.flipY ) {


                uv.y = 1 - uv.y;


            }


            return uv;


        }


        set needsUpdate( value ) {


            if ( value === true ) {


                this.version ++;

                this.source.needsUpdate = true;


            }


        }


        get encoding() { // @deprecated, r152


            warnOnce( 'THREE.Texture: Property .encoding has been replaced by .colorSpace.' );

            return this.colorSpace === SRGBColorSpace ? sRGBEncoding : LinearEncoding;


        }


        set encoding( encoding ) { // @deprecated, r152


            warnOnce( 'THREE.Texture: Property .encoding has been replaced by .colorSpace.' );

            this.colorSpace = encoding === sRGBEncoding ? SRGBColorSpace : NoColorSpace;


        }


    }


    Texture.DEFAULT_IMAGE = null;

    Texture.DEFAULT_MAPPING = UVMapping;

    Texture.DEFAULT_ANISOTROPY = 1;


    class Vector4 {


        constructor( x = 0, y = 0, z = 0, w = 1 ) {


            Vector4.prototype.isVector4 = true;


            this.x = x;

            this.y = y;

            this.z = z;

            this.w = w;


        }


        get width() {


            return this.z;


        }


        set width( value ) {


            this.z = value;


        }


        get height() {


            return this.w;


        }


        set height( value ) {


            this.w = value;


        }


        set( x, y, z, w ) {


            this.x = x;

            this.y = y;

            this.z = z;

            this.w = w;


            return this;


        }


        setScalar( scalar ) {


            this.x = scalar;

            this.y = scalar;

            this.z = scalar;

            this.w = scalar;


            return this;


        }


        setX( x ) {


            this.x = x;


            return this;


        }


        setY( y ) {


            this.y = y;


            return this;


        }


        setZ( z ) {


            this.z = z;


            return this;


        }


        setW( w ) {


            this.w = w;


            return this;


        }


        setComponent( index, value ) {


            switch ( index ) {


                case 0: this.x = value; break;

                case 1: this.y = value; break;

                case 2: this.z = value; break;

                case 3: this.w = value; break;

                default: throw new Error( 'index is out of range: ' + index );


            }


            return this;


        }


        getComponent( index ) {


            switch ( index ) {


                case 0: return this.x;

                case 1: return this.y;

                case 2: return this.z;

                case 3: return this.w;

                default: throw new Error( 'index is out of range: ' + index );


            }


        }


        clone() {


            return new this.constructor( this.x, this.y, this.z, this.w );


        }


        copy( v ) {


            this.x = v.x;

            this.y = v.y;

            this.z = v.z;

            this.w = ( v.w !== undefined ) ? v.w : 1;


            return this;


        }


        add( v ) {


            this.x += v.x;

            this.y += v.y;

            this.z += v.z;

            this.w += v.w;


            return this;


        }


        addScalar( s ) {


            this.x += s;

            this.y += s;

            this.z += s;

            this.w += s;


            return this;


        }


        addVectors( a, b ) {


            this.x = a.x + b.x;

            this.y = a.y + b.y;

            this.z = a.z + b.z;

            this.w = a.w + b.w;


            return this;


        }


        addScaledVector( v, s ) {


            this.x += v.x * s;

            this.y += v.y * s;

            this.z += v.z * s;

            this.w += v.w * s;


            return this;


        }


        sub( v ) {


            this.x -= v.x;

            this.y -= v.y;

            this.z -= v.z;

            this.w -= v.w;


            return this;


        }


        subScalar( s ) {


            this.x -= s;

            this.y -= s;

            this.z -= s;

            this.w -= s;


            return this;


        }


        subVectors( a, b ) {


            this.x = a.x - b.x;

            this.y = a.y - b.y;

            this.z = a.z - b.z;

            this.w = a.w - b.w;


            return this;


        }


        multiply( v ) {


            this.x *= v.x;

            this.y *= v.y;

            this.z *= v.z;

            this.w *= v.w;


            return this;


        }


        multiplyScalar( scalar ) {


            this.x *= scalar;

            this.y *= scalar;

            this.z *= scalar;

            this.w *= scalar;


            return this;


        }


        applyMatrix4( m ) {


            const x = this.x, y = this.y, z = this.z, w = this.w;

            const e = m.elements;


            this.x = e[ 0 ] * x + e[ 4 ] * y + e[ 8 ] * z + e[ 12 ] * w;

            this.y = e[ 1 ] * x + e[ 5 ] * y + e[ 9 ] * z + e[ 13 ] * w;

            this.z = e[ 2 ] * x + e[ 6 ] * y + e[ 10 ] * z + e[ 14 ] * w;

            this.w = e[ 3 ] * x + e[ 7 ] * y + e[ 11 ] * z + e[ 15 ] * w;


            return this;


        }


        divideScalar( scalar ) {


            return this.multiplyScalar( 1 / scalar );


        }


        setAxisAngleFromQuaternion( q ) {


            // http://www.euclideanspace.com/maths/geometry/rotations/conversions/quaternionToAngle/index.htm


            // q is assumed to be normalized


            this.w = 2 * Math.acos( q.w );


            const s = Math.sqrt( 1 - q.w * q.w );


            if ( s < 0.0001 ) {


                this.x = 1;

                this.y = 0;

                this.z = 0;


            } else {


                this.x = q.x / s;

                this.y = q.y / s;

                this.z = q.z / s;


            }


            return this;


        }


        setAxisAngleFromRotationMatrix( m ) {


            // http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToAngle/index.htm


            // assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)


            let angle, x, y, z; // variables for result

            const epsilon = 0.01,       // margin to allow for rounding errors

                epsilon2 = 0.1,     // margin to distinguish between 0 and 180 degrees


                te = m.elements,


                m11 = te[ 0 ], m12 = te[ 4 ], m13 = te[ 8 ],

                m21 = te[ 1 ], m22 = te[ 5 ], m23 = te[ 9 ],

                m31 = te[ 2 ], m32 = te[ 6 ], m33 = te[ 10 ];


            if ( ( Math.abs( m12 - m21 ) < epsilon ) &&

                 ( Math.abs( m13 - m31 ) < epsilon ) &&

                 ( Math.abs( m23 - m32 ) < epsilon ) ) {


                // singularity found

                // first check for identity matrix which must have +1 for all terms

                // in leading diagonal and zero in other terms


                if ( ( Math.abs( m12 + m21 ) < epsilon2 ) &&

                     ( Math.abs( m13 + m31 ) < epsilon2 ) &&

                     ( Math.abs( m23 + m32 ) < epsilon2 ) &&

                     ( Math.abs( m11 + m22 + m33 - 3 ) < epsilon2 ) ) {


                    // this singularity is identity matrix so angle = 0


                    this.set( 1, 0, 0, 0 );


                    return this; // zero angle, arbitrary axis


                }


                // otherwise this singularity is angle = 180


                angle = Math.PI;


                const xx = ( m11 + 1 ) / 2;

                const yy = ( m22 + 1 ) / 2;

                const zz = ( m33 + 1 ) / 2;

                const xy = ( m12 + m21 ) / 4;

                const xz = ( m13 + m31 ) / 4;

                const yz = ( m23 + m32 ) / 4;


                if ( ( xx > yy ) && ( xx > zz ) ) {


                    // m11 is the largest diagonal term


                    if ( xx < epsilon ) {


                        x = 0;

                        y = 0.707106781;

                        z = 0.707106781;


                    } else {


                        x = Math.sqrt( xx );

                        y = xy / x;

                        z = xz / x;


                    }


                } else if ( yy > zz ) {


                    // m22 is the largest diagonal term


                    if ( yy < epsilon ) {


                        x = 0.707106781;

                        y = 0;

                        z = 0.707106781;


                    } else {


                        y = Math.sqrt( yy );

                        x = xy / y;

                        z = yz / y;


                    }


                } else {


                    // m33 is the largest diagonal term so base result on this


                    if ( zz < epsilon ) {


                        x = 0.707106781;

                        y = 0.707106781;

                        z = 0;


                    } else {


                        z = Math.sqrt( zz );

                        x = xz / z;

                        y = yz / z;


                    }


                }


                this.set( x, y, z, angle );


                return this; // return 180 deg rotation


            }


            // as we have reached here there are no singularities so we can handle normally


            let s = Math.sqrt( ( m32 - m23 ) * ( m32 - m23 ) +

                ( m13 - m31 ) * ( m13 - m31 ) +

                ( m21 - m12 ) * ( m21 - m12 ) ); // used to normalize


            if ( Math.abs( s ) < 0.001 ) s = 1;


            // prevent divide by zero, should not happen if matrix is orthogonal and should be

            // caught by singularity test above, but I've left it in just in case


            this.x = ( m32 - m23 ) / s;

            this.y = ( m13 - m31 ) / s;

            this.z = ( m21 - m12 ) / s;

            this.w = Math.acos( ( m11 + m22 + m33 - 1 ) / 2 );


            return this;


        }


        min( v ) {


            this.x = Math.min( this.x, v.x );

            this.y = Math.min( this.y, v.y );

            this.z = Math.min( this.z, v.z );

            this.w = Math.min( this.w, v.w );


            return this;


        }


        max( v ) {


            this.x = Math.max( this.x, v.x );

            this.y = Math.max( this.y, v.y );

            this.z = Math.max( this.z, v.z );

            this.w = Math.max( this.w, v.w );


            return this;


        }


        clamp( min, max ) {


            // assumes min < max, componentwise


            this.x = Math.max( min.x, Math.min( max.x, this.x ) );

            this.y = Math.max( min.y, Math.min( max.y, this.y ) );

            this.z = Math.max( min.z, Math.min( max.z, this.z ) );

            this.w = Math.max( min.w, Math.min( max.w, this.w ) );


            return this;


        }


        clampScalar( minVal, maxVal ) {


            this.x = Math.max( minVal, Math.min( maxVal, this.x ) );

            this.y = Math.max( minVal, Math.min( maxVal, this.y ) );

            this.z = Math.max( minVal, Math.min( maxVal, this.z ) );

            this.w = Math.max( minVal, Math.min( maxVal, this.w ) );


            return this;


        }


        clampLength( min, max ) {


            const length = this.length();


            return this.divideScalar( length || 1 ).multiplyScalar( Math.max( min, Math.min( max, length ) ) );


        }


        floor() {


            this.x = Math.floor( this.x );

            this.y = Math.floor( this.y );

            this.z = Math.floor( this.z );

            this.w = Math.floor( this.w );


            return this;


        }


        ceil() {


            this.x = Math.ceil( this.x );

            this.y = Math.ceil( this.y );

            this.z = Math.ceil( this.z );

            this.w = Math.ceil( this.w );


            return this;


        }


        round() {


            this.x = Math.round( this.x );

            this.y = Math.round( this.y );

            this.z = Math.round( this.z );

            this.w = Math.round( this.w );


            return this;


        }


        roundToZero() {


            this.x = Math.trunc( this.x );

            this.y = Math.trunc( this.y );

            this.z = Math.trunc( this.z );

            this.w = Math.trunc( this.w );


            return this;


        }


        negate() {


            this.x = - this.x;

            this.y = - this.y;

            this.z = - this.z;

            this.w = - this.w;


            return this;


        }


        dot( v ) {


            return this.x * v.x + this.y * v.y + this.z * v.z + this.w * v.w;


        }


        lengthSq() {


            return this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w;


        }


        length() {


            return Math.sqrt( this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w );


        }


        manhattanLength() {


            return Math.abs( this.x ) + Math.abs( this.y ) + Math.abs( this.z ) + Math.abs( this.w );


        }


        normalize() {


            return this.divideScalar( this.length() || 1 );


        }


        setLength( length ) {


            return this.normalize().multiplyScalar( length );


        }


        lerp( v, alpha ) {


            this.x += ( v.x - this.x ) * alpha;

            this.y += ( v.y - this.y ) * alpha;

            this.z += ( v.z - this.z ) * alpha;

            this.w += ( v.w - this.w ) * alpha;


            return this;


        }


        lerpVectors( v1, v2, alpha ) {


            this.x = v1.x + ( v2.x - v1.x ) * alpha;

            this.y = v1.y + ( v2.y - v1.y ) * alpha;

            this.z = v1.z + ( v2.z - v1.z ) * alpha;

            this.w = v1.w + ( v2.w - v1.w ) * alpha;


            return this;


        }


        equals( v ) {


            return ( ( v.x === this.x ) && ( v.y === this.y ) && ( v.z === this.z ) && ( v.w === this.w ) );


        }


        fromArray( array, offset = 0 ) {


            this.x = array[ offset ];

            this.y = array[ offset + 1 ];

            this.z = array[ offset + 2 ];

            this.w = array[ offset + 3 ];


            return this;


        }


        toArray( array = [], offset = 0 ) {


            array[ offset ] = this.x;

            array[ offset + 1 ] = this.y;

            array[ offset + 2 ] = this.z;

            array[ offset + 3 ] = this.w;


            return array;


        }


        fromBufferAttribute( attribute, index ) {


            this.x = attribute.getX( index );

            this.y = attribute.getY( index );

            this.z = attribute.getZ( index );

            this.w = attribute.getW( index );


            return this;


        }


        random() {


            this.x = Math.random();

            this.y = Math.random();

            this.z = Math.random();

            this.w = Math.random();


            return this;


        }


        *[ Symbol.iterator ]() {


            yield this.x;

            yield this.y;

            yield this.z;

            yield this.w;


        }


    }


    /*

     In options, we can specify:

     * Texture parameters for an auto-generated target texture

     * depthBuffer/stencilBuffer: Booleans to indicate if we should generate these buffers

    */

    class RenderTarget extends EventDispatcher {


        constructor( width = 1, height = 1, options = {} ) {


            super();


            this.isRenderTarget = true;


            this.width = width;

            this.height = height;

            this.depth = 1;


            this.scissor = new Vector4( 0, 0, width, height );

            this.scissorTest = false;


            this.viewport = new Vector4( 0, 0, width, height );


            const image = { width: width, height: height, depth: 1 };


            if ( options.encoding !== undefined ) {


                // @deprecated, r152

                warnOnce( 'THREE.WebGLRenderTarget: option.encoding has been replaced by option.colorSpace.' );

                options.colorSpace = options.encoding === sRGBEncoding ? SRGBColorSpace : NoColorSpace;


            }


            options = Object.assign( {

                generateMipmaps: false,

                internalFormat: null,

                minFilter: LinearFilter,

                depthBuffer: true,

                stencilBuffer: false,

                depthTexture: null,

                samples: 0

            }, options );


            this.texture = new Texture( image, options.mapping, options.wrapS, options.wrapT, options.magFilter, options.minFilter, options.format, options.type, options.anisotropy, options.colorSpace );

            this.texture.isRenderTargetTexture = true;


            this.texture.flipY = false;

            this.texture.generateMipmaps = options.generateMipmaps;

            this.texture.internalFormat = options.internalFormat;


            this.depthBuffer = options.depthBuffer;

            this.stencilBuffer = options.stencilBuffer;


            this.depthTexture = options.depthTexture;


            this.samples = options.samples;


        }


        setSize( width, height, depth = 1 ) {


            if ( this.width !== width || this.height !== height || this.depth !== depth ) {


                this.width = width;

                this.height = height;

                this.depth = depth;


                this.texture.image.width = width;

                this.texture.image.height = height;

                this.texture.image.depth = depth;


                this.dispose();


            }


            this.viewport.set( 0, 0, width, height );

            this.scissor.set( 0, 0, width, height );


        }


        clone() {


            return new this.constructor().copy( this );


        }


        copy( source ) {


            this.width = source.width;

            this.height = source.height;

            this.depth = source.depth;


            this.scissor.copy( source.scissor );

            this.scissorTest = source.scissorTest;


            this.viewport.copy( source.viewport );


            this.texture = source.texture.clone();

            this.texture.isRenderTargetTexture = true;


            // ensure image object is not shared, see #20328


            const image = Object.assign( {}, source.texture.image );

            this.texture.source = new Source( image );


            this.depthBuffer = source.depthBuffer;

            this.stencilBuffer = source.stencilBuffer;


            if ( source.depthTexture !== null ) this.depthTexture = source.depthTexture.clone();


            this.samples = source.samples;


            return this;


        }


        dispose() {


            this.dispatchEvent( { type: 'dispose' } );


        }


    }


    class WebGLRenderTarget extends RenderTarget {


        constructor( width = 1, height = 1, options = {} ) {


            super( width, height, options );


            this.isWebGLRenderTarget = true;


        }


    }


    class DataArrayTexture extends Texture {


        constructor( data = null, width = 1, height = 1, depth = 1 ) {


            super( null );


            this.isDataArrayTexture = true;


            this.image = { data, width, height, depth };


            this.magFilter = NearestFilter;

            this.minFilter = NearestFilter;


            this.wrapR = ClampToEdgeWrapping;


            this.generateMipmaps = false;

            this.flipY = false;

            this.unpackAlignment = 1;


        }


    }


    class WebGLArrayRenderTarget extends WebGLRenderTarget {


        constructor( width = 1, height = 1, depth = 1, options = {} ) {


            super( width, height, options );


            this.isWebGLArrayRenderTarget = true;


            this.depth = depth;


            this.texture = new DataArrayTexture( null, width, height, depth );


            this.texture.isRenderTargetTexture = true;


        }


    }


    class Data3DTexture extends Texture {


        constructor( data = null, width = 1, height = 1, depth = 1 ) {


            // We're going to add .setXXX() methods for setting properties later.

            // Users can still set in DataTexture3D directly.

            //

            //  const texture = new THREE.DataTexture3D( data, width, height, depth );

            //  texture.anisotropy = 16;

            //

            // See #14839


            super( null );


            this.isData3DTexture = true;


            this.image = { data, width, height, depth };


            this.magFilter = NearestFilter;

            this.minFilter = NearestFilter;


            this.wrapR = ClampToEdgeWrapping;


            this.generateMipmaps = false;

            this.flipY = false;

            this.unpackAlignment = 1;


        }


    }


    class WebGL3DRenderTarget extends WebGLRenderTarget {


        constructor( width = 1, height = 1, depth = 1, options = {} ) {


            super( width, height, options );


            this.isWebGL3DRenderTarget = true;


            this.depth = depth;


            this.texture = new Data3DTexture( null, width, height, depth );


            this.texture.isRenderTargetTexture = true;


        }


    }


    class WebGLMultipleRenderTargets extends WebGLRenderTarget {


        constructor( width = 1, height = 1, count = 1, options = {} ) {


            super( width, height, options );


            this.isWebGLMultipleRenderTargets = true;


            const texture = this.texture;


            this.texture = [];


            for ( let i = 0; i < count; i ++ ) {


                this.texture[ i ] = texture.clone();

                this.texture[ i ].isRenderTargetTexture = true;


            }


        }


        setSize( width, height, depth = 1 ) {


            if ( this.width !== width || this.height !== height || this.depth !== depth ) {


                this.width = width;

                this.height = height;

                this.depth = depth;


                for ( let i = 0, il = this.texture.length; i < il; i ++ ) {


                    this.texture[ i ].image.width = width;

                    this.texture[ i ].image.height = height;

                    this.texture[ i ].image.depth = depth;


                }


                this.dispose();


            }


            this.viewport.set( 0, 0, width, height );

            this.scissor.set( 0, 0, width, height );


        }


        copy( source ) {


            this.dispose();


            this.width = source.width;

            this.height = source.height;

            this.depth = source.depth;


            this.scissor.copy( source.scissor );

            this.scissorTest = source.scissorTest;


            this.viewport.copy( source.viewport );


            this.depthBuffer = source.depthBuffer;

            this.stencilBuffer = source.stencilBuffer;


            if ( source.depthTexture !== null ) this.depthTexture = source.depthTexture.clone();


            this.texture.length = 0;


            for ( let i = 0, il = source.texture.length; i < il; i ++ ) {


                this.texture[ i ] = source.texture[ i ].clone();

                this.texture[ i ].isRenderTargetTexture = true;


            }


            return this;


        }


    }


    class Quaternion {


        constructor( x = 0, y = 0, z = 0, w = 1 ) {


            this.isQuaternion = true;


            this._x = x;

            this._y = y;

            this._z = z;

            this._w = w;


        }


        static slerpFlat( dst, dstOffset, src0, srcOffset0, src1, srcOffset1, t ) {


            // fuzz-free, array-based Quaternion SLERP operation


            let x0 = src0[ srcOffset0 + 0 ],

                y0 = src0[ srcOffset0 + 1 ],

                z0 = src0[ srcOffset0 + 2 ],

                w0 = src0[ srcOffset0 + 3 ];


            const x1 = src1[ srcOffset1 + 0 ],

                y1 = src1[ srcOffset1 + 1 ],

                z1 = src1[ srcOffset1 + 2 ],

                w1 = src1[ srcOffset1 + 3 ];


            if ( t === 0 ) {


                dst[ dstOffset + 0 ] = x0;

                dst[ dstOffset + 1 ] = y0;

                dst[ dstOffset + 2 ] = z0;

                dst[ dstOffset + 3 ] = w0;

                return;


            }


            if ( t === 1 ) {


                dst[ dstOffset + 0 ] = x1;

                dst[ dstOffset + 1 ] = y1;

                dst[ dstOffset + 2 ] = z1;

                dst[ dstOffset + 3 ] = w1;

                return;


            }


            if ( w0 !== w1 || x0 !== x1 || y0 !== y1 || z0 !== z1 ) {


                let s = 1 - t;

                const cos = x0 * x1 + y0 * y1 + z0 * z1 + w0 * w1,

                    dir = ( cos >= 0 ? 1 : - 1 ),

                    sqrSin = 1 - cos * cos;


                // Skip the Slerp for tiny steps to avoid numeric problems:

                if ( sqrSin > Number.EPSILON ) {


                    const sin = Math.sqrt( sqrSin ),

                        len = Math.atan2( sin, cos * dir );


                    s = Math.sin( s * len ) / sin;

                    t = Math.sin( t * len ) / sin;


                }


                const tDir = t * dir;


                x0 = x0 * s + x1 * tDir;

                y0 = y0 * s + y1 * tDir;

                z0 = z0 * s + z1 * tDir;

                w0 = w0 * s + w1 * tDir;


                // Normalize in case we just did a lerp:

                if ( s === 1 - t ) {


                    const f = 1 / Math.sqrt( x0 * x0 + y0 * y0 + z0 * z0 + w0 * w0 );


                    x0 *= f;

                    y0 *= f;

                    z0 *= f;

                    w0 *= f;


                }


            }


            dst[ dstOffset ] = x0;

            dst[ dstOffset + 1 ] = y0;

            dst[ dstOffset + 2 ] = z0;

            dst[ dstOffset + 3 ] = w0;


        }


        static multiplyQuaternionsFlat( dst, dstOffset, src0, srcOffset0, src1, srcOffset1 ) {


            const x0 = src0[ srcOffset0 ];

            const y0 = src0[ srcOffset0 + 1 ];

            const z0 = src0[ srcOffset0 + 2 ];

            const w0 = src0[ srcOffset0 + 3 ];


            const x1 = src1[ srcOffset1 ];

            const y1 = src1[ srcOffset1 + 1 ];

            const z1 = src1[ srcOffset1 + 2 ];

            const w1 = src1[ srcOffset1 + 3 ];


            dst[ dstOffset ] = x0 * w1 + w0 * x1 + y0 * z1 - z0 * y1;

            dst[ dstOffset + 1 ] = y0 * w1 + w0 * y1 + z0 * x1 - x0 * z1;

            dst[ dstOffset + 2 ] = z0 * w1 + w0 * z1 + x0 * y1 - y0 * x1;

            dst[ dstOffset + 3 ] = w0 * w1 - x0 * x1 - y0 * y1 - z0 * z1;


            return dst;


        }


        get x() {


            return this._x;


        }


        set x( value ) {


            this._x = value;

            this._onChangeCallback();


        }


        get y() {


            return this._y;


        }


        set y( value ) {


            this._y = value;

            this._onChangeCallback();


        }


        get z() {


            return this._z;


        }


        set z( value ) {


            this._z = value;

            this._onChangeCallback();


        }


        get w() {


            return this._w;


        }


        set w( value ) {


            this._w = value;

            this._onChangeCallback();


        }


        set( x, y, z, w ) {


            this._x = x;

            this._y = y;

            this._z = z;

            this._w = w;


            this._onChangeCallback();


            return this;


        }


        clone() {


            return new this.constructor( this._x, this._y, this._z, this._w );


        }


        copy( quaternion ) {


            this._x = quaternion.x;

            this._y = quaternion.y;

            this._z = quaternion.z;

            this._w = quaternion.w;


            this._onChangeCallback();


            return this;


        }


        setFromEuler( euler, update = true ) {


            const x = euler._x, y = euler._y, z = euler._z, order = euler._order;


            // http://www.mathworks.com/matlabcentral/fileexchange/

            //  20696-function-to-convert-between-dcm-euler-angles-quaternions-and-euler-vectors/

            //  content/SpinCalc.m


            const cos = Math.cos;

            const sin = Math.sin;


            const c1 = cos( x / 2 );

            const c2 = cos( y / 2 );

            const c3 = cos( z / 2 );


            const s1 = sin( x / 2 );

            const s2 = sin( y / 2 );

            const s3 = sin( z / 2 );


            switch ( order ) {


                case 'XYZ':

                    this._x = s1 * c2 * c3 + c1 * s2 * s3;

                    this._y = c1 * s2 * c3 - s1 * c2 * s3;

                    this._z = c1 * c2 * s3 + s1 * s2 * c3;

                    this._w = c1 * c2 * c3 - s1 * s2 * s3;

                    break;


                case 'YXZ':

                    this._x = s1 * c2 * c3 + c1 * s2 * s3;

                    this._y = c1 * s2 * c3 - s1 * c2 * s3;

                    this._z = c1 * c2 * s3 - s1 * s2 * c3;

                    this._w = c1 * c2 * c3 + s1 * s2 * s3;

                    break;


                case 'ZXY':

                    this._x = s1 * c2 * c3 - c1 * s2 * s3;

                    this._y = c1 * s2 * c3 + s1 * c2 * s3;

                    this._z = c1 * c2 * s3 + s1 * s2 * c3;

                    this._w = c1 * c2 * c3 - s1 * s2 * s3;

                    break;


                case 'ZYX':

                    this._x = s1 * c2 * c3 - c1 * s2 * s3;

                    this._y = c1 * s2 * c3 + s1 * c2 * s3;

                    this._z = c1 * c2 * s3 - s1 * s2 * c3;

                    this._w = c1 * c2 * c3 + s1 * s2 * s3;

                    break;


                case 'YZX':

                    this._x = s1 * c2 * c3 + c1 * s2 * s3;

                    this._y = c1 * s2 * c3 + s1 * c2 * s3;

                    this._z = c1 * c2 * s3 - s1 * s2 * c3;

                    this._w = c1 * c2 * c3 - s1 * s2 * s3;

                    break;


                case 'XZY':

                    this._x = s1 * c2 * c3 - c1 * s2 * s3;

                    this._y = c1 * s2 * c3 - s1 * c2 * s3;

                    this._z = c1 * c2 * s3 + s1 * s2 * c3;

                    this._w = c1 * c2 * c3 + s1 * s2 * s3;

                    break;


                default:

                    console.warn( 'THREE.Quaternion: .setFromEuler() encountered an unknown order: ' + order );


            }


            if ( update === true ) this._onChangeCallback();


            return this;


        }


        setFromAxisAngle( axis, angle ) {


            // http://www.euclideanspace.com/maths/geometry/rotations/conversions/angleToQuaternion/index.htm


            // assumes axis is normalized


            const halfAngle = angle / 2, s = Math.sin( halfAngle );


            this._x = axis.x * s;

            this._y = axis.y * s;

            this._z = axis.z * s;

            this._w = Math.cos( halfAngle );


            this._onChangeCallback();


            return this;


        }


        setFromRotationMatrix( m ) {


            // http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToQuaternion/index.htm


            // assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)


            const te = m.elements,


                m11 = te[ 0 ], m12 = te[ 4 ], m13 = te[ 8 ],

                m21 = te[ 1 ], m22 = te[ 5 ], m23 = te[ 9 ],

                m31 = te[ 2 ], m32 = te[ 6 ], m33 = te[ 10 ],


                trace = m11 + m22 + m33;


            if ( trace > 0 ) {


                const s = 0.5 / Math.sqrt( trace + 1.0 );


                this._w = 0.25 / s;

                this._x = ( m32 - m23 ) * s;

                this._y = ( m13 - m31 ) * s;

                this._z = ( m21 - m12 ) * s;


            } else if ( m11 > m22 && m11 > m33 ) {


                const s = 2.0 * Math.sqrt( 1.0 + m11 - m22 - m33 );


                this._w = ( m32 - m23 ) / s;

                this._x = 0.25 * s;

                this._y = ( m12 + m21 ) / s;

                this._z = ( m13 + m31 ) / s;


            } else if ( m22 > m33 ) {


                const s = 2.0 * Math.sqrt( 1.0 + m22 - m11 - m33 );


                this._w = ( m13 - m31 ) / s;

                this._x = ( m12 + m21 ) / s;

                this._y = 0.25 * s;

                this._z = ( m23 + m32 ) / s;


            } else {


                const s = 2.0 * Math.sqrt( 1.0 + m33 - m11 - m22 );


                this._w = ( m21 - m12 ) / s;

                this._x = ( m13 + m31 ) / s;

                this._y = ( m23 + m32 ) / s;

                this._z = 0.25 * s;


            }


            this._onChangeCallback();


            return this;


        }


        setFromUnitVectors( vFrom, vTo ) {


            // assumes direction vectors vFrom and vTo are normalized


            let r = vFrom.dot( vTo ) + 1;


            if ( r < Number.EPSILON ) {


                // vFrom and vTo point in opposite directions


                r = 0;


                if ( Math.abs( vFrom.x ) > Math.abs( vFrom.z ) ) {


                    this._x = - vFrom.y;

                    this._y = vFrom.x;

                    this._z = 0;

                    this._w = r;


                } else {


                    this._x = 0;

                    this._y = - vFrom.z;

                    this._z = vFrom.y;

                    this._w = r;


                }


            } else {


                // crossVectors( vFrom, vTo ); // inlined to avoid cyclic dependency on Vector3


                this._x = vFrom.y * vTo.z - vFrom.z * vTo.y;

                this._y = vFrom.z * vTo.x - vFrom.x * vTo.z;

                this._z = vFrom.x * vTo.y - vFrom.y * vTo.x;

                this._w = r;


            }


            return this.normalize();


        }


        angleTo( q ) {


            return 2 * Math.acos( Math.abs( clamp( this.dot( q ), - 1, 1 ) ) );


        }


        rotateTowards( q, step ) {


            const angle = this.angleTo( q );


            if ( angle === 0 ) return this;


            const t = Math.min( 1, step / angle );


            this.slerp( q, t );


            return this;


        }


        identity() {


            return this.set( 0, 0, 0, 1 );


        }


        invert() {


            // quaternion is assumed to have unit length


            return this.conjugate();


        }


        conjugate() {


            this._x *= - 1;

            this._y *= - 1;

            this._z *= - 1;


            this._onChangeCallback();


            return this;


        }


        dot( v ) {


            return this._x * v._x + this._y * v._y + this._z * v._z + this._w * v._w;


        }


        lengthSq() {


            return this._x * this._x + this._y * this._y + this._z * this._z + this._w * this._w;


        }


        length() {


            return Math.sqrt( this._x * this._x + this._y * this._y + this._z * this._z + this._w * this._w );


        }


        normalize() {


            let l = this.length();


            if ( l === 0 ) {


                this._x = 0;

                this._y = 0;

                this._z = 0;

                this._w = 1;


            } else {


                l = 1 / l;


                this._x = this._x * l;

                this._y = this._y * l;

                this._z = this._z * l;

                this._w = this._w * l;


            }


            this._onChangeCallback();


            return this;


        }


        multiply( q ) {


            return this.multiplyQuaternions( this, q );


        }


        premultiply( q ) {


            return this.multiplyQuaternions( q, this );


        }


        multiplyQuaternions( a, b ) {


            // from http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/code/index.htm


            const qax = a._x, qay = a._y, qaz = a._z, qaw = a._w;

            const qbx = b._x, qby = b._y, qbz = b._z, qbw = b._w;


            this._x = qax * qbw + qaw * qbx + qay * qbz - qaz * qby;

            this._y = qay * qbw + qaw * qby + qaz * qbx - qax * qbz;

            this._z = qaz * qbw + qaw * qbz + qax * qby - qay * qbx;

            this._w = qaw * qbw - qax * qbx - qay * qby - qaz * qbz;


            this._onChangeCallback();


            return this;


        }


        slerp( qb, t ) {


            if ( t === 0 ) return this;

            if ( t === 1 ) return this.copy( qb );


            const x = this._x, y = this._y, z = this._z, w = this._w;


            // http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/slerp/


            let cosHalfTheta = w * qb._w + x * qb._x + y * qb._y + z * qb._z;


            if ( cosHalfTheta < 0 ) {


                this._w = - qb._w;

                this._x = - qb._x;

                this._y = - qb._y;

                this._z = - qb._z;


                cosHalfTheta = - cosHalfTheta;


            } else {


                this.copy( qb );


            }


            if ( cosHalfTheta >= 1.0 ) {


                this._w = w;

                this._x = x;

                this._y = y;

                this._z = z;


                return this;


            }


            const sqrSinHalfTheta = 1.0 - cosHalfTheta * cosHalfTheta;


            if ( sqrSinHalfTheta <= Number.EPSILON ) {


                const s = 1 - t;

                this._w = s * w + t * this._w;

                this._x = s * x + t * this._x;

                this._y = s * y + t * this._y;

                this._z = s * z + t * this._z;


                this.normalize(); // normalize calls _onChangeCallback()


                return this;


            }


            const sinHalfTheta = Math.sqrt( sqrSinHalfTheta );

            const halfTheta = Math.atan2( sinHalfTheta, cosHalfTheta );

            const ratioA = Math.sin( ( 1 - t ) * halfTheta ) / sinHalfTheta,

                ratioB = Math.sin( t * halfTheta ) / sinHalfTheta;


            this._w = ( w * ratioA + this._w * ratioB );

            this._x = ( x * ratioA + this._x * ratioB );

            this._y = ( y * ratioA + this._y * ratioB );

            this._z = ( z * ratioA + this._z * ratioB );


            this._onChangeCallback();


            return this;


        }


        slerpQuaternions( qa, qb, t ) {


            return this.copy( qa ).slerp( qb, t );


        }


        random() {


            // Derived from http://planning.cs.uiuc.edu/node198.html

            // Note, this source uses w, x, y, z ordering,

            // so we swap the order below.


            const u1 = Math.random();

            const sqrt1u1 = Math.sqrt( 1 - u1 );

            const sqrtu1 = Math.sqrt( u1 );


            const u2 = 2 * Math.PI * Math.random();


            const u3 = 2 * Math.PI * Math.random();


            return this.set(

                sqrt1u1 * Math.cos( u2 ),

                sqrtu1 * Math.sin( u3 ),

                sqrtu1 * Math.cos( u3 ),

                sqrt1u1 * Math.sin( u2 ),

            );


        }


        equals( quaternion ) {


            return ( quaternion._x === this._x ) && ( quaternion._y === this._y ) && ( quaternion._z === this._z ) && ( quaternion._w === this._w );


        }


        fromArray( array, offset = 0 ) {


            this._x = array[ offset ];

            this._y = array[ offset + 1 ];

            this._z = array[ offset + 2 ];

            this._w = array[ offset + 3 ];


            this._onChangeCallback();


            return this;


        }


        toArray( array = [], offset = 0 ) {


            array[ offset ] = this._x;

            array[ offset + 1 ] = this._y;

            array[ offset + 2 ] = this._z;

            array[ offset + 3 ] = this._w;


            return array;


        }


        fromBufferAttribute( attribute, index ) {


            this._x = attribute.getX( index );

            this._y = attribute.getY( index );

            this._z = attribute.getZ( index );

            this._w = attribute.getW( index );


            this._onChangeCallback();


            return this;


        }


        toJSON() {


            return this.toArray();


        }


        _onChange( callback ) {


            this._onChangeCallback = callback;


            return this;


        }


        _onChangeCallback() {}


        *[ Symbol.iterator ]() {


            yield this._x;

            yield this._y;

            yield this._z;

            yield this._w;


        }


    }


    class Vector3 {


        constructor( x = 0, y = 0, z = 0 ) {


            Vector3.prototype.isVector3 = true;


            this.x = x;

            this.y = y;

            this.z = z;


        }


        set( x, y, z ) {


            if ( z === undefined ) z = this.z; // sprite.scale.set(x,y)


            this.x = x;

            this.y = y;

            this.z = z;


            return this;


        }


        setScalar( scalar ) {


            this.x = scalar;

            this.y = scalar;

            this.z = scalar;


            return this;


        }


        setX( x ) {


            this.x = x;


            return this;


        }


        setY( y ) {


            this.y = y;


            return this;


        }


        setZ( z ) {


            this.z = z;


            return this;


        }


        setComponent( index, value ) {


            switch ( index ) {


                case 0: this.x = value; break;

                case 1: this.y = value; break;

                case 2: this.z = value; break;

                default: throw new Error( 'index is out of range: ' + index );


            }


            return this;


        }


        getComponent( index ) {


            switch ( index ) {


                case 0: return this.x;

                case 1: return this.y;

                case 2: return this.z;

                default: throw new Error( 'index is out of range: ' + index );


            }


        }


        clone() {


            return new this.constructor( this.x, this.y, this.z );


        }


        copy( v ) {


            this.x = v.x;

            this.y = v.y;

            this.z = v.z;


            return this;


        }


        add( v ) {


            this.x += v.x;

            this.y += v.y;

            this.z += v.z;


            return this;


        }


        addScalar( s ) {


            this.x += s;

            this.y += s;

            this.z += s;


            return this;


        }


        addVectors( a, b ) {


            this.x = a.x + b.x;

            this.y = a.y + b.y;

            this.z = a.z + b.z;


            return this;


        }


        addScaledVector( v, s ) {


            this.x += v.x * s;

            this.y += v.y * s;

            this.z += v.z * s;


            return this;


        }


        sub( v ) {


            this.x -= v.x;

            this.y -= v.y;

            this.z -= v.z;


            return this;


        }


        subScalar( s ) {


            this.x -= s;

            this.y -= s;

            this.z -= s;


            return this;


        }


        subVectors( a, b ) {


            this.x = a.x - b.x;

            this.y = a.y - b.y;

            this.z = a.z - b.z;


            return this;


        }


        multiply( v ) {


            this.x *= v.x;

            this.y *= v.y;

            this.z *= v.z;


            return this;


        }


        multiplyScalar( scalar ) {


            this.x *= scalar;

            this.y *= scalar;

            this.z *= scalar;


            return this;


        }


        multiplyVectors( a, b ) {


            this.x = a.x * b.x;

            this.y = a.y * b.y;

            this.z = a.z * b.z;


            return this;


        }


        applyEuler( euler ) {


            return this.applyQuaternion( _quaternion$4.setFromEuler( euler ) );


        }


        applyAxisAngle( axis, angle ) {


            return this.applyQuaternion( _quaternion$4.setFromAxisAngle( axis, angle ) );


        }


        applyMatrix3( m ) {


            const x = this.x, y = this.y, z = this.z;

            const e = m.elements;


            this.x = e[ 0 ] * x + e[ 3 ] * y + e[ 6 ] * z;

            this.y = e[ 1 ] * x + e[ 4 ] * y + e[ 7 ] * z;

            this.z = e[ 2 ] * x + e[ 5 ] * y + e[ 8 ] * z;


            return this;


        }


        applyNormalMatrix( m ) {


            return this.applyMatrix3( m ).normalize();


        }


        applyMatrix4( m ) {


            const x = this.x, y = this.y, z = this.z;

            const e = m.elements;


            const w = 1 / ( e[ 3 ] * x + e[ 7 ] * y + e[ 11 ] * z + e[ 15 ] );


            this.x = ( e[ 0 ] * x + e[ 4 ] * y + e[ 8 ] * z + e[ 12 ] ) * w;

            this.y = ( e[ 1 ] * x + e[ 5 ] * y + e[ 9 ] * z + e[ 13 ] ) * w;

            this.z = ( e[ 2 ] * x + e[ 6 ] * y + e[ 10 ] * z + e[ 14 ] ) * w;


            return this;


        }


        applyQuaternion( q ) {


            // quaternion q is assumed to have unit length


            const vx = this.x, vy = this.y, vz = this.z;

            const qx = q.x, qy = q.y, qz = q.z, qw = q.w;


            // t = 2 * cross( q.xyz, v );

            const tx = 2 * ( qy * vz - qz * vy );

            const ty = 2 * ( qz * vx - qx * vz );

            const tz = 2 * ( qx * vy - qy * vx );


            // v + q.w * t + cross( q.xyz, t );

            this.x = vx + qw * tx + qy * tz - qz * ty;

            this.y = vy + qw * ty + qz * tx - qx * tz;

            this.z = vz + qw * tz + qx * ty - qy * tx;


            return this;


        }


        project( camera ) {


            return this.applyMatrix4( camera.matrixWorldInverse ).applyMatrix4( camera.projectionMatrix );


        }


        unproject( camera ) {


            return this.applyMatrix4( camera.projectionMatrixInverse ).applyMatrix4( camera.matrixWorld );


        }


        transformDirection( m ) {


            // input: THREE.Matrix4 affine matrix

            // vector interpreted as a direction


            const x = this.x, y = this.y, z = this.z;

            const e = m.elements;


            this.x = e[ 0 ] * x + e[ 4 ] * y + e[ 8 ] * z;

            this.y = e[ 1 ] * x + e[ 5 ] * y + e[ 9 ] * z;

            this.z = e[ 2 ] * x + e[ 6 ] * y + e[ 10 ] * z;


            return this.normalize();


        }


        divide( v ) {


            this.x /= v.x;

            this.y /= v.y;

            this.z /= v.z;


            return this;


        }


        divideScalar( scalar ) {


            return this.multiplyScalar( 1 / scalar );


        }


        min( v ) {


            this.x = Math.min( this.x, v.x );

            this.y = Math.min( this.y, v.y );

            this.z = Math.min( this.z, v.z );


            return this;


        }


        max( v ) {


            this.x = Math.max( this.x, v.x );

            this.y = Math.max( this.y, v.y );

            this.z = Math.max( this.z, v.z );


            return this;


        }


        clamp( min, max ) {


            // assumes min < max, componentwise


            this.x = Math.max( min.x, Math.min( max.x, this.x ) );

            this.y = Math.max( min.y, Math.min( max.y, this.y ) );

            this.z = Math.max( min.z, Math.min( max.z, this.z ) );


            return this;


        }


        clampScalar( minVal, maxVal ) {


            this.x = Math.max( minVal, Math.min( maxVal, this.x ) );

            this.y = Math.max( minVal, Math.min( maxVal, this.y ) );

            this.z = Math.max( minVal, Math.min( maxVal, this.z ) );


            return this;


        }


        clampLength( min, max ) {


            const length = this.length();


            return this.divideScalar( length || 1 ).multiplyScalar( Math.max( min, Math.min( max, length ) ) );


        }


        floor() {


            this.x = Math.floor( this.x );

            this.y = Math.floor( this.y );

            this.z = Math.floor( this.z );


            return this;


        }


        ceil() {


            this.x = Math.ceil( this.x );

            this.y = Math.ceil( this.y );

            this.z = Math.ceil( this.z );


            return this;


        }


        round() {


            this.x = Math.round( this.x );

            this.y = Math.round( this.y );

            this.z = Math.round( this.z );


            return this;


        }


        roundToZero() {


            this.x = Math.trunc( this.x );

            this.y = Math.trunc( this.y );

            this.z = Math.trunc( this.z );


            return this;


        }


        negate() {


            this.x = - this.x;

            this.y = - this.y;

            this.z = - this.z;


            return this;


        }


        dot( v ) {


            return this.x * v.x + this.y * v.y + this.z * v.z;


        }


        // TODO lengthSquared?


        lengthSq() {


            return this.x * this.x + this.y * this.y + this.z * this.z;


        }


        length() {


            return Math.sqrt( this.x * this.x + this.y * this.y + this.z * this.z );


        }


        manhattanLength() {


            return Math.abs( this.x ) + Math.abs( this.y ) + Math.abs( this.z );


        }


        normalize() {


            return this.divideScalar( this.length() || 1 );


        }


        setLength( length ) {


            return this.normalize().multiplyScalar( length );


        }


        lerp( v, alpha ) {


            this.x += ( v.x - this.x ) * alpha;

            this.y += ( v.y - this.y ) * alpha;

            this.z += ( v.z - this.z ) * alpha;


            return this;


        }


        lerpVectors( v1, v2, alpha ) {


            this.x = v1.x + ( v2.x - v1.x ) * alpha;

            this.y = v1.y + ( v2.y - v1.y ) * alpha;

            this.z = v1.z + ( v2.z - v1.z ) * alpha;


            return this;


        }


        cross( v ) {


            return this.crossVectors( this, v );


        }


        crossVectors( a, b ) {


            const ax = a.x, ay = a.y, az = a.z;

            const bx = b.x, by = b.y, bz = b.z;


            this.x = ay * bz - az * by;

            this.y = az * bx - ax * bz;

            this.z = ax * by - ay * bx;


            return this;


        }


        projectOnVector( v ) {


            const denominator = v.lengthSq();


            if ( denominator === 0 ) return this.set( 0, 0, 0 );


            const scalar = v.dot( this ) / denominator;


            return this.copy( v ).multiplyScalar( scalar );


        }


        projectOnPlane( planeNormal ) {


            _vector$c.copy( this ).projectOnVector( planeNormal );


            return this.sub( _vector$c );


        }


        reflect( normal ) {


            // reflect incident vector off plane orthogonal to normal

            // normal is assumed to have unit length


            return this.sub( _vector$c.copy( normal ).multiplyScalar( 2 * this.dot( normal ) ) );


        }


        angleTo( v ) {


            const denominator = Math.sqrt( this.lengthSq() * v.lengthSq() );


            if ( denominator === 0 ) return Math.PI / 2;


            const theta = this.dot( v ) / denominator;


            // clamp, to handle numerical problems


            return Math.acos( clamp( theta, - 1, 1 ) );


        }


        distanceTo( v ) {


            return Math.sqrt( this.distanceToSquared( v ) );


        }


        distanceToSquared( v ) {


            const dx = this.x - v.x, dy = this.y - v.y, dz = this.z - v.z;


            return dx * dx + dy * dy + dz * dz;


        }


        manhattanDistanceTo( v ) {


            return Math.abs( this.x - v.x ) + Math.abs( this.y - v.y ) + Math.abs( this.z - v.z );


        }


        setFromSpherical( s ) {


            return this.setFromSphericalCoords( s.radius, s.phi, s.theta );


        }


        setFromSphericalCoords( radius, phi, theta ) {


            const sinPhiRadius = Math.sin( phi ) * radius;


            this.x = sinPhiRadius * Math.sin( theta );

            this.y = Math.cos( phi ) * radius;

            this.z = sinPhiRadius * Math.cos( theta );


            return this;


        }


        setFromCylindrical( c ) {


            return this.setFromCylindricalCoords( c.radius, c.theta, c.y );


        }


        setFromCylindricalCoords( radius, theta, y ) {


            this.x = radius * Math.sin( theta );

            this.y = y;

            this.z = radius * Math.cos( theta );


            return this;


        }


        setFromMatrixPosition( m ) {


            const e = m.elements;


            this.x = e[ 12 ];

            this.y = e[ 13 ];

            this.z = e[ 14 ];


            return this;


        }


        setFromMatrixScale( m ) {


            const sx = this.setFromMatrixColumn( m, 0 ).length();

            const sy = this.setFromMatrixColumn( m, 1 ).length();

            const sz = this.setFromMatrixColumn( m, 2 ).length();


            this.x = sx;

            this.y = sy;

            this.z = sz;


            return this;


        }


        setFromMatrixColumn( m, index ) {


            return this.fromArray( m.elements, index * 4 );


        }


        setFromMatrix3Column( m, index ) {


            return this.fromArray( m.elements, index * 3 );


        }


        setFromEuler( e ) {


            this.x = e._x;

            this.y = e._y;

            this.z = e._z;


            return this;


        }


        setFromColor( c ) {


            this.x = c.r;

            this.y = c.g;

            this.z = c.b;


            return this;


        }


        equals( v ) {


            return ( ( v.x === this.x ) && ( v.y === this.y ) && ( v.z === this.z ) );


        }


        fromArray( array, offset = 0 ) {


            this.x = array[ offset ];

            this.y = array[ offset + 1 ];

            this.z = array[ offset + 2 ];


            return this;


        }


        toArray( array = [], offset = 0 ) {


            array[ offset ] = this.x;

            array[ offset + 1 ] = this.y;

            array[ offset + 2 ] = this.z;


            return array;


        }


        fromBufferAttribute( attribute, index ) {


            this.x = attribute.getX( index );

            this.y = attribute.getY( index );

            this.z = attribute.getZ( index );


            return this;


        }


        random() {


            this.x = Math.random();

            this.y = Math.random();

            this.z = Math.random();


            return this;


        }


        randomDirection() {


            // Derived from https://mathworld.wolfram.com/SpherePointPicking.html


            const u = ( Math.random() - 0.5 ) * 2;

            const t = Math.random() * Math.PI * 2;

            const f = Math.sqrt( 1 - u ** 2 );


            this.x = f * Math.cos( t );

            this.y = f * Math.sin( t );

            this.z = u;


            return this;


        }


        *[ Symbol.iterator ]() {


            yield this.x;

            yield this.y;

            yield this.z;


        }


    }


    const _vector$c = /*@__PURE__*/ new Vector3();

    const _quaternion$4 = /*@__PURE__*/ new Quaternion();


    class Box3 {


        constructor( min = new Vector3( + Infinity, + Infinity, + Infinity ), max = new Vector3( - Infinity, - Infinity, - Infinity ) ) {


            this.isBox3 = true;


            this.min = min;

            this.max = max;


        }


        set( min, max ) {


            this.min.copy( min );

            this.max.copy( max );


            return this;


        }


        setFromArray( array ) {


            this.makeEmpty();


            for ( let i = 0, il = array.length; i < il; i += 3 ) {


                this.expandByPoint( _vector$b.fromArray( array, i ) );


            }


            return this;


        }


        setFromBufferAttribute( attribute ) {


            this.makeEmpty();


            for ( let i = 0, il = attribute.count; i < il; i ++ ) {


                this.expandByPoint( _vector$b.fromBufferAttribute( attribute, i ) );


            }


            return this;


        }


        setFromPoints( points ) {


            this.makeEmpty();


            for ( let i = 0, il = points.length; i < il; i ++ ) {


                this.expandByPoint( points[ i ] );


            }


            return this;


        }


        setFromCenterAndSize( center, size ) {


            const halfSize = _vector$b.copy( size ).multiplyScalar( 0.5 );


            this.min.copy( center ).sub( halfSize );

            this.max.copy( center ).add( halfSize );


            return this;


        }


        setFromObject( object, precise = false ) {


            this.makeEmpty();


            return this.expandByObject( object, precise );


        }


        clone() {


            return new this.constructor().copy( this );


        }


        copy( box ) {


            this.min.copy( box.min );

            this.max.copy( box.max );


            return this;


        }


        makeEmpty() {


            this.min.x = this.min.y = this.min.z = + Infinity;

            this.max.x = this.max.y = this.max.z = - Infinity;


            return this;


        }


        isEmpty() {


            // this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes


            return ( this.max.x < this.min.x ) || ( this.max.y < this.min.y ) || ( this.max.z < this.min.z );


        }


        getCenter( target ) {


            return this.isEmpty() ? target.set( 0, 0, 0 ) : target.addVectors( this.min, this.max ).multiplyScalar( 0.5 );


        }


        getSize( target ) {


            return this.isEmpty() ? target.set( 0, 0, 0 ) : target.subVectors( this.max, this.min );


        }


        expandByPoint( point ) {


            this.min.min( point );

            this.max.max( point );


            return this;


        }


        expandByVector( vector ) {


            this.min.sub( vector );

            this.max.add( vector );


            return this;


        }


        expandByScalar( scalar ) {


            this.min.addScalar( - scalar );

            this.max.addScalar( scalar );


            return this;


        }


        expandByObject( object, precise = false ) {


            // Computes the world-axis-aligned bounding box of an object (including its children),

            // accounting for both the object's, and children's, world transforms


            object.updateWorldMatrix( false, false );


            const geometry = object.geometry;


            if ( geometry !== undefined ) {


                const positionAttribute = geometry.getAttribute( 'position' );


                // precise AABB computation based on vertex data requires at least a position attribute.

                // instancing isn't supported so far and uses the normal (conservative) code path.


                if ( precise === true && positionAttribute !== undefined && object.isInstancedMesh !== true ) {


                    for ( let i = 0, l = positionAttribute.count; i < l; i ++ ) {


                        if ( object.isMesh === true ) {


                            object.getVertexPosition( i, _vector$b );


                        } else {


                            _vector$b.fromBufferAttribute( positionAttribute, i );


                        }


                        _vector$b.applyMatrix4( object.matrixWorld );

                        this.expandByPoint( _vector$b );


                    }


                } else {


                    if ( object.boundingBox !== undefined ) {


                        // object-level bounding box


                        if ( object.boundingBox === null ) {


                            object.computeBoundingBox();


                        }


                        _box$4.copy( object.boundingBox );


                    } else {


                        // geometry-level bounding box


                        if ( geometry.boundingBox === null ) {


                            geometry.computeBoundingBox();


                        }


                        _box$4.copy( geometry.boundingBox );


                    }


                    _box$4.applyMatrix4( object.matrixWorld );


                    this.union( _box$4 );


                }


            }


            const children = object.children;


            for ( let i = 0, l = children.length; i < l; i ++ ) {


                this.expandByObject( children[ i ], precise );


            }


            return this;


        }


        containsPoint( point ) {


            return point.x < this.min.x || point.x > this.max.x ||

                point.y < this.min.y || point.y > this.max.y ||

                point.z < this.min.z || point.z > this.max.z ? false : true;


        }


        containsBox( box ) {


            return this.min.x <= box.min.x && box.max.x <= this.max.x &&

                this.min.y <= box.min.y && box.max.y <= this.max.y &&

                this.min.z <= box.min.z && box.max.z <= this.max.z;


        }


        getParameter( point, target ) {


            // This can potentially have a divide by zero if the box

            // has a size dimension of 0.


            return target.set(

                ( point.x - this.min.x ) / ( this.max.x - this.min.x ),

                ( point.y - this.min.y ) / ( this.max.y - this.min.y ),

                ( point.z - this.min.z ) / ( this.max.z - this.min.z )

            );


        }


        intersectsBox( box ) {


            // using 6 splitting planes to rule out intersections.

            return box.max.x < this.min.x || box.min.x > this.max.x ||

                box.max.y < this.min.y || box.min.y > this.max.y ||

                box.max.z < this.min.z || box.min.z > this.max.z ? false : true;


        }


        intersectsSphere( sphere ) {


            // Find the point on the AABB closest to the sphere center.

            this.clampPoint( sphere.center, _vector$b );


            // If that point is inside the sphere, the AABB and sphere intersect.

            return _vector$b.distanceToSquared( sphere.center ) <= ( sphere.radius * sphere.radius );


        }


        intersectsPlane( plane ) {


            // We compute the minimum and maximum dot product values. If those values

            // are on the same side (back or front) of the plane, then there is no intersection.


            let min, max;


            if ( plane.normal.x > 0 ) {


                min = plane.normal.x * this.min.x;

                max = plane.normal.x * this.max.x;


            } else {


                min = plane.normal.x * this.max.x;

                max = plane.normal.x * this.min.x;


            }


            if ( plane.normal.y > 0 ) {


                min += plane.normal.y * this.min.y;

                max += plane.normal.y * this.max.y;


            } else {


                min += plane.normal.y * this.max.y;

                max += plane.normal.y * this.min.y;


            }


            if ( plane.normal.z > 0 ) {


                min += plane.normal.z * this.min.z;

                max += plane.normal.z * this.max.z;


            } else {


                min += plane.normal.z * this.max.z;

                max += plane.normal.z * this.min.z;


            }


            return ( min <= - plane.constant && max >= - plane.constant );


        }


        intersectsTriangle( triangle ) {


            if ( this.isEmpty() ) {


                return false;


            }


            // compute box center and extents

            this.getCenter( _center );

            _extents.subVectors( this.max, _center );


            // translate triangle to aabb origin

            _v0$2.subVectors( triangle.a, _center );

            _v1$7.subVectors( triangle.b, _center );

            _v2$4.subVectors( triangle.c, _center );


            // compute edge vectors for triangle

            _f0.subVectors( _v1$7, _v0$2 );

            _f1.subVectors( _v2$4, _v1$7 );

            _f2.subVectors( _v0$2, _v2$4 );


            // test against axes that are given by cross product combinations of the edges of the triangle and the edges of the aabb

            // make an axis testing of each of the 3 sides of the aabb against each of the 3 sides of the triangle = 9 axis of separation

            // axis_ij = u_i x f_j (u0, u1, u2 = face normals of aabb = x,y,z axes vectors since aabb is axis aligned)

            let axes = [

                0, - _f0.z, _f0.y, 0, - _f1.z, _f1.y, 0, - _f2.z, _f2.y,

                _f0.z, 0, - _f0.x, _f1.z, 0, - _f1.x, _f2.z, 0, - _f2.x,

                - _f0.y, _f0.x, 0, - _f1.y, _f1.x, 0, - _f2.y, _f2.x, 0

            ];

            if ( ! satForAxes( axes, _v0$2, _v1$7, _v2$4, _extents ) ) {


                return false;


            }


            // test 3 face normals from the aabb

            axes = [ 1, 0, 0, 0, 1, 0, 0, 0, 1 ];

            if ( ! satForAxes( axes, _v0$2, _v1$7, _v2$4, _extents ) ) {


                return false;


            }


            // finally testing the face normal of the triangle

            // use already existing triangle edge vectors here

            _triangleNormal.crossVectors( _f0, _f1 );

            axes = [ _triangleNormal.x, _triangleNormal.y, _triangleNormal.z ];


            return satForAxes( axes, _v0$2, _v1$7, _v2$4, _extents );


        }


        clampPoint( point, target ) {


            return target.copy( point ).clamp( this.min, this.max );


        }


        distanceToPoint( point ) {


            return this.clampPoint( point, _vector$b ).distanceTo( point );


        }


        getBoundingSphere( target ) {


            if ( this.isEmpty() ) {


                target.makeEmpty();


            } else {


                this.getCenter( target.center );


                target.radius = this.getSize( _vector$b ).length() * 0.5;


            }


            return target;


        }


        intersect( box ) {


            this.min.max( box.min );

            this.max.min( box.max );


            // ensure that if there is no overlap, the result is fully empty, not slightly empty with non-inf/+inf values that will cause subsequence intersects to erroneously return valid values.

            if ( this.isEmpty() ) this.makeEmpty();


            return this;


        }


        union( box ) {


            this.min.min( box.min );

            this.max.max( box.max );


            return this;


        }


        applyMatrix4( matrix ) {


            // transform of empty box is an empty box.

            if ( this.isEmpty() ) return this;


            // NOTE: I am using a binary pattern to specify all 2^3 combinations below

            _points[ 0 ].set( this.min.x, this.min.y, this.min.z ).applyMatrix4( matrix ); // 000

            _points[ 1 ].set( this.min.x, this.min.y, this.max.z ).applyMatrix4( matrix ); // 001

            _points[ 2 ].set( this.min.x, this.max.y, this.min.z ).applyMatrix4( matrix ); // 010

            _points[ 3 ].set( this.min.x, this.max.y, this.max.z ).applyMatrix4( matrix ); // 011

            _points[ 4 ].set( this.max.x, this.min.y, this.min.z ).applyMatrix4( matrix ); // 100

            _points[ 5 ].set( this.max.x, this.min.y, this.max.z ).applyMatrix4( matrix ); // 101

            _points[ 6 ].set( this.max.x, this.max.y, this.min.z ).applyMatrix4( matrix ); // 110

            _points[ 7 ].set( this.max.x, this.max.y, this.max.z ).applyMatrix4( matrix ); // 111


            this.setFromPoints( _points );


            return this;


        }


        translate( offset ) {


            this.min.add( offset );

            this.max.add( offset );


            return this;


        }


        equals( box ) {


            return box.min.equals( this.min ) && box.max.equals( this.max );


        }


    }


    const _points = [

        /*@__PURE__*/ new Vector3(),

        /*@__PURE__*/ new Vector3(),

        /*@__PURE__*/ new Vector3(),

        /*@__PURE__*/ new Vector3(),

        /*@__PURE__*/ new Vector3(),

        /*@__PURE__*/ new Vector3(),

        /*@__PURE__*/ new Vector3(),

        /*@__PURE__*/ new Vector3()

    ];


    const _vector$b = /*@__PURE__*/ new Vector3();


    const _box$4 = /*@__PURE__*/ new Box3();


    // triangle centered vertices


    const _v0$2 = /*@__PURE__*/ new Vector3();

    const _v1$7 = /*@__PURE__*/ new Vector3();

    const _v2$4 = /*@__PURE__*/ new Vector3();


    // triangle edge vectors


    const _f0 = /*@__PURE__*/ new Vector3();

    const _f1 = /*@__PURE__*/ new Vector3();

    const _f2 = /*@__PURE__*/ new Vector3();


    const _center = /*@__PURE__*/ new Vector3();

    const _extents = /*@__PURE__*/ new Vector3();

    const _triangleNormal = /*@__PURE__*/ new Vector3();

    const _testAxis = /*@__PURE__*/ new Vector3();


    function satForAxes( axes, v0, v1, v2, extents ) {


        for ( let i = 0, j = axes.length - 3; i <= j; i += 3 ) {


            _testAxis.fromArray( axes, i );

            // project the aabb onto the separating axis

            const r = extents.x * Math.abs( _testAxis.x ) + extents.y * Math.abs( _testAxis.y ) + extents.z * Math.abs( _testAxis.z );

            // project all 3 vertices of the triangle onto the separating axis

            const p0 = v0.dot( _testAxis );

            const p1 = v1.dot( _testAxis );

            const p2 = v2.dot( _testAxis );

            // actual test, basically see if either of the most extreme of the triangle points intersects r

            if ( Math.max( - Math.max( p0, p1, p2 ), Math.min( p0, p1, p2 ) ) > r ) {


                // points of the projected triangle are outside the projected half-length of the aabb

                // the axis is separating and we can exit

                return false;


            }


        }


        return true;


    }


    const _box$3 = /*@__PURE__*/ new Box3();

    const _v1$6 = /*@__PURE__*/ new Vector3();

    const _v2$3 = /*@__PURE__*/ new Vector3();


    class Sphere {


        constructor( center = new Vector3(), radius = - 1 ) {


            this.isSphere = true;


            this.center = center;

            this.radius = radius;


        }


        set( center, radius ) {


            this.center.copy( center );

            this.radius = radius;


            return this;


        }


        setFromPoints( points, optionalCenter ) {


            const center = this.center;


            if ( optionalCenter !== undefined ) {


                center.copy( optionalCenter );


            } else {


                _box$3.setFromPoints( points ).getCenter( center );


            }


            let maxRadiusSq = 0;


            for ( let i = 0, il = points.length; i < il; i ++ ) {


                maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( points[ i ] ) );


            }


            this.radius = Math.sqrt( maxRadiusSq );


            return this;


        }


        copy( sphere ) {


            this.center.copy( sphere.center );

            this.radius = sphere.radius;


            return this;


        }


        isEmpty() {


            return ( this.radius < 0 );


        }


        makeEmpty() {


            this.center.set( 0, 0, 0 );

            this.radius = - 1;


            return this;


        }


        containsPoint( point ) {


            return ( point.distanceToSquared( this.center ) <= ( this.radius * this.radius ) );


        }


        distanceToPoint( point ) {


            return ( point.distanceTo( this.center ) - this.radius );


        }


        intersectsSphere( sphere ) {


            const radiusSum = this.radius + sphere.radius;


            return sphere.center.distanceToSquared( this.center ) <= ( radiusSum * radiusSum );


        }


        intersectsBox( box ) {


            return box.intersectsSphere( this );


        }


        intersectsPlane( plane ) {


            return Math.abs( plane.distanceToPoint( this.center ) ) <= this.radius;


        }


        clampPoint( point, target ) {


            const deltaLengthSq = this.center.distanceToSquared( point );


            target.copy( point );


            if ( deltaLengthSq > ( this.radius * this.radius ) ) {


                target.sub( this.center ).normalize();

                target.multiplyScalar( this.radius ).add( this.center );


            }


            return target;


        }


        getBoundingBox( target ) {


            if ( this.isEmpty() ) {


                // Empty sphere produces empty bounding box

                target.makeEmpty();

                return target;


            }


            target.set( this.center, this.center );

            target.expandByScalar( this.radius );


            return target;


        }


        applyMatrix4( matrix ) {


            this.center.applyMatrix4( matrix );

            this.radius = this.radius * matrix.getMaxScaleOnAxis();


            return this;


        }


        translate( offset ) {


            this.center.add( offset );


            return this;


        }


        expandByPoint( point ) {


            if ( this.isEmpty() ) {


                this.center.copy( point );


                this.radius = 0;


                return this;


            }


            _v1$6.subVectors( point, this.center );


            const lengthSq = _v1$6.lengthSq();


            if ( lengthSq > ( this.radius * this.radius ) ) {


                // calculate the minimal sphere


                const length = Math.sqrt( lengthSq );


                const delta = ( length - this.radius ) * 0.5;


                this.center.addScaledVector( _v1$6, delta / length );


                this.radius += delta;


            }


            return this;


        }


        union( sphere ) {


            if ( sphere.isEmpty() ) {


                return this;


            }


            if ( this.isEmpty() ) {


                this.copy( sphere );


                return this;


            }


            if ( this.center.equals( sphere.center ) === true ) {


                 this.radius = Math.max( this.radius, sphere.radius );


            } else {


                _v2$3.subVectors( sphere.center, this.center ).setLength( sphere.radius );


                this.expandByPoint( _v1$6.copy( sphere.center ).add( _v2$3 ) );


                this.expandByPoint( _v1$6.copy( sphere.center ).sub( _v2$3 ) );


            }


            return this;


        }


        equals( sphere ) {


            return sphere.center.equals( this.center ) && ( sphere.radius === this.radius );


        }


        clone() {


            return new this.constructor().copy( this );


        }


    }


    const _vector$a = /*@__PURE__*/ new Vector3();

    const _segCenter = /*@__PURE__*/ new Vector3();

    const _segDir = /*@__PURE__*/ new Vector3();

    const _diff = /*@__PURE__*/ new Vector3();


    const _edge1 = /*@__PURE__*/ new Vector3();

    const _edge2 = /*@__PURE__*/ new Vector3();

    const _normal$1 = /*@__PURE__*/ new Vector3();


    class Ray {


        constructor( origin = new Vector3(), direction = new Vector3( 0, 0, - 1 ) ) {


            this.origin = origin;

            this.direction = direction;


        }


        set( origin, direction ) {


            this.origin.copy( origin );

            this.direction.copy( direction );


            return this;


        }


        copy( ray ) {


            this.origin.copy( ray.origin );

            this.direction.copy( ray.direction );


            return this;


        }


        at( t, target ) {


            return target.copy( this.origin ).addScaledVector( this.direction, t );


        }


        lookAt( v ) {


            this.direction.copy( v ).sub( this.origin ).normalize();


            return this;


        }


        recast( t ) {


            this.origin.copy( this.at( t, _vector$a ) );


            return this;


        }


        closestPointToPoint( point, target ) {


            target.subVectors( point, this.origin );


            const directionDistance = target.dot( this.direction );


            if ( directionDistance < 0 ) {


                return target.copy( this.origin );


            }


            return target.copy( this.origin ).addScaledVector( this.direction, directionDistance );


        }


        distanceToPoint( point ) {


            return Math.sqrt( this.distanceSqToPoint( point ) );


        }


        distanceSqToPoint( point ) {


            const directionDistance = _vector$a.subVectors( point, this.origin ).dot( this.direction );


            // point behind the ray


            if ( directionDistance < 0 ) {


                return this.origin.distanceToSquared( point );


            }


            _vector$a.copy( this.origin ).addScaledVector( this.direction, directionDistance );


            return _vector$a.distanceToSquared( point );


        }


        distanceSqToSegment( v0, v1, optionalPointOnRay, optionalPointOnSegment ) {


            // from https://github.com/pmjoniak/GeometricTools/blob/master/GTEngine/Include/Mathematics/GteDistRaySegment.h

            // It returns the min distance between the ray and the segment

            // defined by v0 and v1

            // It can also set two optional targets :

            // - The closest point on the ray

            // - The closest point on the segment


            _segCenter.copy( v0 ).add( v1 ).multiplyScalar( 0.5 );

            _segDir.copy( v1 ).sub( v0 ).normalize();

            _diff.copy( this.origin ).sub( _segCenter );


            const segExtent = v0.distanceTo( v1 ) * 0.5;

            const a01 = - this.direction.dot( _segDir );

            const b0 = _diff.dot( this.direction );

            const b1 = - _diff.dot( _segDir );

            const c = _diff.lengthSq();

            const det = Math.abs( 1 - a01 * a01 );

            let s0, s1, sqrDist, extDet;


            if ( det > 0 ) {


                // The ray and segment are not parallel.


                s0 = a01 * b1 - b0;

                s1 = a01 * b0 - b1;

                extDet = segExtent * det;


                if ( s0 >= 0 ) {


                    if ( s1 >= - extDet ) {


                        if ( s1 <= extDet ) {


                            // region 0

                            // Minimum at interior points of ray and segment.


                            const invDet = 1 / det;

                            s0 *= invDet;

                            s1 *= invDet;

                            sqrDist = s0 * ( s0 + a01 * s1 + 2 * b0 ) + s1 * ( a01 * s0 + s1 + 2 * b1 ) + c;


                        } else {


                            // region 1


                            s1 = segExtent;

                            s0 = Math.max( 0, - ( a01 * s1 + b0 ) );

                            sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;


                        }


                    } else {


                        // region 5


                        s1 = - segExtent;

                        s0 = Math.max( 0, - ( a01 * s1 + b0 ) );

                        sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;


                    }


                } else {


                    if ( s1 <= - extDet ) {


                        // region 4


                        s0 = Math.max( 0, - ( - a01 * segExtent + b0 ) );

                        s1 = ( s0 > 0 ) ? - segExtent : Math.min( Math.max( - segExtent, - b1 ), segExtent );

                        sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;


                    } else if ( s1 <= extDet ) {


                        // region 3


                        s0 = 0;

                        s1 = Math.min( Math.max( - segExtent, - b1 ), segExtent );

                        sqrDist = s1 * ( s1 + 2 * b1 ) + c;


                    } else {


                        // region 2


                        s0 = Math.max( 0, - ( a01 * segExtent + b0 ) );

                        s1 = ( s0 > 0 ) ? segExtent : Math.min( Math.max( - segExtent, - b1 ), segExtent );

                        sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;


                    }


                }


            } else {


                // Ray and segment are parallel.


                s1 = ( a01 > 0 ) ? - segExtent : segExtent;

                s0 = Math.max( 0, - ( a01 * s1 + b0 ) );

                sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;


            }


            if ( optionalPointOnRay ) {


                optionalPointOnRay.copy( this.origin ).addScaledVector( this.direction, s0 );


            }


            if ( optionalPointOnSegment ) {


                optionalPointOnSegment.copy( _segCenter ).addScaledVector( _segDir, s1 );


            }


            return sqrDist;


        }


        intersectSphere( sphere, target ) {


            _vector$a.subVectors( sphere.center, this.origin );

            const tca = _vector$a.dot( this.direction );

            const d2 = _vector$a.dot( _vector$a ) - tca * tca;

            const radius2 = sphere.radius * sphere.radius;


            if ( d2 > radius2 ) return null;


            const thc = Math.sqrt( radius2 - d2 );


            // t0 = first intersect point - entrance on front of sphere

            const t0 = tca - thc;


            // t1 = second intersect point - exit point on back of sphere

            const t1 = tca + thc;


            // test to see if t1 is behind the ray - if so, return null

            if ( t1 < 0 ) return null;


            // test to see if t0 is behind the ray:

            // if it is, the ray is inside the sphere, so return the second exit point scaled by t1,

            // in order to always return an intersect point that is in front of the ray.

            if ( t0 < 0 ) return this.at( t1, target );


            // else t0 is in front of the ray, so return the first collision point scaled by t0

            return this.at( t0, target );


        }


        intersectsSphere( sphere ) {


            return this.distanceSqToPoint( sphere.center ) <= ( sphere.radius * sphere.radius );


        }


        distanceToPlane( plane ) {


            const denominator = plane.normal.dot( this.direction );


            if ( denominator === 0 ) {


                // line is coplanar, return origin

                if ( plane.distanceToPoint( this.origin ) === 0 ) {


                    return 0;


                }


                // Null is preferable to undefined since undefined means.... it is undefined


                return null;


            }


            const t = - ( this.origin.dot( plane.normal ) + plane.constant ) / denominator;


            // Return if the ray never intersects the plane


            return t >= 0 ? t : null;


        }


        intersectPlane( plane, target ) {


            const t = this.distanceToPlane( plane );


            if ( t === null ) {


                return null;


            }


            return this.at( t, target );


        }


        intersectsPlane( plane ) {


            // check if the ray lies on the plane first


            const distToPoint = plane.distanceToPoint( this.origin );


            if ( distToPoint === 0 ) {


                return true;


            }


            const denominator = plane.normal.dot( this.direction );


            if ( denominator * distToPoint < 0 ) {


                return true;


            }


            // ray origin is behind the plane (and is pointing behind it)


            return false;


        }


        intersectBox( box, target ) {


            let tmin, tmax, tymin, tymax, tzmin, tzmax;


            const invdirx = 1 / this.direction.x,

                invdiry = 1 / this.direction.y,

                invdirz = 1 / this.direction.z;


            const origin = this.origin;


            if ( invdirx >= 0 ) {


                tmin = ( box.min.x - origin.x ) * invdirx;

                tmax = ( box.max.x - origin.x ) * invdirx;


            } else {


                tmin = ( box.max.x - origin.x ) * invdirx;

                tmax = ( box.min.x - origin.x ) * invdirx;


            }


            if ( invdiry >= 0 ) {


                tymin = ( box.min.y - origin.y ) * invdiry;

                tymax = ( box.max.y - origin.y ) * invdiry;


            } else {


                tymin = ( box.max.y - origin.y ) * invdiry;

                tymax = ( box.min.y - origin.y ) * invdiry;


            }


            if ( ( tmin > tymax ) || ( tymin > tmax ) ) return null;


            if ( tymin > tmin || isNaN( tmin ) ) tmin = tymin;


            if ( tymax < tmax || isNaN( tmax ) ) tmax = tymax;


            if ( invdirz >= 0 ) {


                tzmin = ( box.min.z - origin.z ) * invdirz;

                tzmax = ( box.max.z - origin.z ) * invdirz;


            } else {


                tzmin = ( box.max.z - origin.z ) * invdirz;

                tzmax = ( box.min.z - origin.z ) * invdirz;


            }


            if ( ( tmin > tzmax ) || ( tzmin > tmax ) ) return null;


            if ( tzmin > tmin || tmin !== tmin ) tmin = tzmin;


            if ( tzmax < tmax || tmax !== tmax ) tmax = tzmax;


            //return point closest to the ray (positive side)


            if ( tmax < 0 ) return null;


            return this.at( tmin >= 0 ? tmin : tmax, target );


        }


        intersectsBox( box ) {


            return this.intersectBox( box, _vector$a ) !== null;


        }


        intersectTriangle( a, b, c, backfaceCulling, target ) {


            // Compute the offset origin, edges, and normal.


            // from https://github.com/pmjoniak/GeometricTools/blob/master/GTEngine/Include/Mathematics/GteIntrRay3Triangle3.h


            _edge1.subVectors( b, a );

            _edge2.subVectors( c, a );

            _normal$1.crossVectors( _edge1, _edge2 );


            // Solve Q + t*D = b1*E1 + b2*E2 (Q = kDiff, D = ray direction,

            // E1 = kEdge1, E2 = kEdge2, N = Cross(E1,E2)) by

            //   |Dot(D,N)|*b1 = sign(Dot(D,N))*Dot(D,Cross(Q,E2))

            //   |Dot(D,N)|*b2 = sign(Dot(D,N))*Dot(D,Cross(E1,Q))

            //   |Dot(D,N)|*t = -sign(Dot(D,N))*Dot(Q,N)

            let DdN = this.direction.dot( _normal$1 );

            let sign;


            if ( DdN > 0 ) {


                if ( backfaceCulling ) return null;

                sign = 1;


            } else if ( DdN < 0 ) {


                sign = - 1;

                DdN = - DdN;


            } else {


                return null;


            }


            _diff.subVectors( this.origin, a );

            const DdQxE2 = sign * this.direction.dot( _edge2.crossVectors( _diff, _edge2 ) );


            // b1 < 0, no intersection

            if ( DdQxE2 < 0 ) {


                return null;


            }


            const DdE1xQ = sign * this.direction.dot( _edge1.cross( _diff ) );


            // b2 < 0, no intersection

            if ( DdE1xQ < 0 ) {


                return null;


            }


            // b1+b2 > 1, no intersection

            if ( DdQxE2 + DdE1xQ > DdN ) {


                return null;


            }


            // Line intersects triangle, check if ray does.

            const QdN = - sign * _diff.dot( _normal$1 );


            // t < 0, no intersection

            if ( QdN < 0 ) {


                return null;


            }


            // Ray intersects triangle.

            return this.at( QdN / DdN, target );


        }


        applyMatrix4( matrix4 ) {


            this.origin.applyMatrix4( matrix4 );

            this.direction.transformDirection( matrix4 );


            return this;


        }


        equals( ray ) {


            return ray.origin.equals( this.origin ) && ray.direction.equals( this.direction );


        }


        clone() {


            return new this.constructor().copy( this );


        }


    }


    class Matrix4 {


        constructor( n11, n12, n13, n14, n21, n22, n23, n24, n31, n32, n33, n34, n41, n42, n43, n44 ) {


            Matrix4.prototype.isMatrix4 = true;


            this.elements = [


                1, 0, 0, 0,

                0, 1, 0, 0,

                0, 0, 1, 0,

                0, 0, 0, 1


            ];


            if ( n11 !== undefined ) {


                this.set( n11, n12, n13, n14, n21, n22, n23, n24, n31, n32, n33, n34, n41, n42, n43, n44 );


            }


        }


        set( n11, n12, n13, n14, n21, n22, n23, n24, n31, n32, n33, n34, n41, n42, n43, n44 ) {


            const te = this.elements;


            te[ 0 ] = n11; te[ 4 ] = n12; te[ 8 ] = n13; te[ 12 ] = n14;

            te[ 1 ] = n21; te[ 5 ] = n22; te[ 9 ] = n23; te[ 13 ] = n24;

            te[ 2 ] = n31; te[ 6 ] = n32; te[ 10 ] = n33; te[ 14 ] = n34;

            te[ 3 ] = n41; te[ 7 ] = n42; te[ 11 ] = n43; te[ 15 ] = n44;


            return this;


        }


        identity() {


            this.set(


                1, 0, 0, 0,

                0, 1, 0, 0,

                0, 0, 1, 0,

                0, 0, 0, 1


            );


            return this;


        }


        clone() {


            return new Matrix4().fromArray( this.elements );


        }


        copy( m ) {


            const te = this.elements;

            const me = m.elements;


            te[ 0 ] = me[ 0 ]; te[ 1 ] = me[ 1 ]; te[ 2 ] = me[ 2 ]; te[ 3 ] = me[ 3 ];

            te[ 4 ] = me[ 4 ]; te[ 5 ] = me[ 5 ]; te[ 6 ] = me[ 6 ]; te[ 7 ] = me[ 7 ];

            te[ 8 ] = me[ 8 ]; te[ 9 ] = me[ 9 ]; te[ 10 ] = me[ 10 ]; te[ 11 ] = me[ 11 ];

            te[ 12 ] = me[ 12 ]; te[ 13 ] = me[ 13 ]; te[ 14 ] = me[ 14 ]; te[ 15 ] = me[ 15 ];


            return this;


        }


        copyPosition( m ) {


            const te = this.elements, me = m.elements;


            te[ 12 ] = me[ 12 ];

            te[ 13 ] = me[ 13 ];

            te[ 14 ] = me[ 14 ];


            return this;


        }


        setFromMatrix3( m ) {


            const me = m.elements;


            this.set(


                me[ 0 ], me[ 3 ], me[ 6 ], 0,

                me[ 1 ], me[ 4 ], me[ 7 ], 0,

                me[ 2 ], me[ 5 ], me[ 8 ], 0,

                0, 0, 0, 1


            );


            return this;


        }


        extractBasis( xAxis, yAxis, zAxis ) {


            xAxis.setFromMatrixColumn( this, 0 );

            yAxis.setFromMatrixColumn( this, 1 );

            zAxis.setFromMatrixColumn( this, 2 );


            return this;


        }


        makeBasis( xAxis, yAxis, zAxis ) {


            this.set(

                xAxis.x, yAxis.x, zAxis.x, 0,

                xAxis.y, yAxis.y, zAxis.y, 0,

                xAxis.z, yAxis.z, zAxis.z, 0,

                0, 0, 0, 1

            );


            return this;


        }


        extractRotation( m ) {


            // this method does not support reflection matrices


            const te = this.elements;

            const me = m.elements;


            const scaleX = 1 / _v1$5.setFromMatrixColumn( m, 0 ).length();

            const scaleY = 1 / _v1$5.setFromMatrixColumn( m, 1 ).length();

            const scaleZ = 1 / _v1$5.setFromMatrixColumn( m, 2 ).length();


            te[ 0 ] = me[ 0 ] * scaleX;

            te[ 1 ] = me[ 1 ] * scaleX;

            te[ 2 ] = me[ 2 ] * scaleX;

            te[ 3 ] = 0;


            te[ 4 ] = me[ 4 ] * scaleY;

            te[ 5 ] = me[ 5 ] * scaleY;

            te[ 6 ] = me[ 6 ] * scaleY;

            te[ 7 ] = 0;


            te[ 8 ] = me[ 8 ] * scaleZ;

            te[ 9 ] = me[ 9 ] * scaleZ;

            te[ 10 ] = me[ 10 ] * scaleZ;

            te[ 11 ] = 0;


            te[ 12 ] = 0;

            te[ 13 ] = 0;

            te[ 14 ] = 0;

            te[ 15 ] = 1;


            return this;


        }


        makeRotationFromEuler( euler ) {


            const te = this.elements;


            const x = euler.x, y = euler.y, z = euler.z;

            const a = Math.cos( x ), b = Math.sin( x );

            const c = Math.cos( y ), d = Math.sin( y );

            const e = Math.cos( z ), f = Math.sin( z );


            if ( euler.order === 'XYZ' ) {


                const ae = a * e, af = a * f, be = b * e, bf = b * f;


                te[ 0 ] = c * e;

                te[ 4 ] = - c * f;

                te[ 8 ] = d;


                te[ 1 ] = af + be * d;

                te[ 5 ] = ae - bf * d;

                te[ 9 ] = - b * c;


                te[ 2 ] = bf - ae * d;

                te[ 6 ] = be + af * d;

                te[ 10 ] = a * c;


            } else if ( euler.order === 'YXZ' ) {


                const ce = c * e, cf = c * f, de = d * e, df = d * f;


                te[ 0 ] = ce + df * b;

                te[ 4 ] = de * b - cf;

                te[ 8 ] = a * d;


                te[ 1 ] = a * f;

                te[ 5 ] = a * e;

                te[ 9 ] = - b;


                te[ 2 ] = cf * b - de;

                te[ 6 ] = df + ce * b;

                te[ 10 ] = a * c;


            } else if ( euler.order === 'ZXY' ) {


                const ce = c * e, cf = c * f, de = d * e, df = d * f;


                te[ 0 ] = ce - df * b;

                te[ 4 ] = - a * f;

                te[ 8 ] = de + cf * b;


                te[ 1 ] = cf + de * b;

                te[ 5 ] = a * e;

                te[ 9 ] = df - ce * b;


                te[ 2 ] = - a * d;

                te[ 6 ] = b;

                te[ 10 ] = a * c;


            } else if ( euler.order === 'ZYX' ) {


                const ae = a * e, af = a * f, be = b * e, bf = b * f;


                te[ 0 ] = c * e;

                te[ 4 ] = be * d - af;

                te[ 8 ] = ae * d + bf;


                te[ 1 ] = c * f;

                te[ 5 ] = bf * d + ae;

                te[ 9 ] = af * d - be;


                te[ 2 ] = - d;

                te[ 6 ] = b * c;

                te[ 10 ] = a * c;


            } else if ( euler.order === 'YZX' ) {


                const ac = a * c, ad = a * d, bc = b * c, bd = b * d;


                te[ 0 ] = c * e;

                te[ 4 ] = bd - ac * f;

                te[ 8 ] = bc * f + ad;


                te[ 1 ] = f;

                te[ 5 ] = a * e;

                te[ 9 ] = - b * e;


                te[ 2 ] = - d * e;

                te[ 6 ] = ad * f + bc;

                te[ 10 ] = ac - bd * f;


            } else if ( euler.order === 'XZY' ) {


                const ac = a * c, ad = a * d, bc = b * c, bd = b * d;


                te[ 0 ] = c * e;

                te[ 4 ] = - f;

                te[ 8 ] = d * e;


                te[ 1 ] = ac * f + bd;

                te[ 5 ] = a * e;

                te[ 9 ] = ad * f - bc;


                te[ 2 ] = bc * f - ad;

                te[ 6 ] = b * e;

                te[ 10 ] = bd * f + ac;


            }


            // bottom row

            te[ 3 ] = 0;

            te[ 7 ] = 0;

            te[ 11 ] = 0;


            // last column

            te[ 12 ] = 0;

            te[ 13 ] = 0;

            te[ 14 ] = 0;

            te[ 15 ] = 1;


            return this;


        }


        makeRotationFromQuaternion( q ) {


            return this.compose( _zero, q, _one );


        }


        lookAt( eye, target, up ) {


            const te = this.elements;


            _z.subVectors( eye, target );


            if ( _z.lengthSq() === 0 ) {


                // eye and target are in the same position


                _z.z = 1;


            }


            _z.normalize();

            _x.crossVectors( up, _z );


            if ( _x.lengthSq() === 0 ) {


                // up and z are parallel


                if ( Math.abs( up.z ) === 1 ) {


                    _z.x += 0.0001;


                } else {


                    _z.z += 0.0001;


                }


                _z.normalize();

                _x.crossVectors( up, _z );


            }


            _x.normalize();

            _y.crossVectors( _z, _x );


            te[ 0 ] = _x.x; te[ 4 ] = _y.x; te[ 8 ] = _z.x;

            te[ 1 ] = _x.y; te[ 5 ] = _y.y; te[ 9 ] = _z.y;

            te[ 2 ] = _x.z; te[ 6 ] = _y.z; te[ 10 ] = _z.z;


            return this;


        }


        multiply( m ) {


            return this.multiplyMatrices( this, m );


        }


        premultiply( m ) {


            return this.multiplyMatrices( m, this );


        }


        multiplyMatrices( a, b ) {


            const ae = a.elements;

            const be = b.elements;

            const te = this.elements;


            const a11 = ae[ 0 ], a12 = ae[ 4 ], a13 = ae[ 8 ], a14 = ae[ 12 ];

            const a21 = ae[ 1 ], a22 = ae[ 5 ], a23 = ae[ 9 ], a24 = ae[ 13 ];

            const a31 = ae[ 2 ], a32 = ae[ 6 ], a33 = ae[ 10 ], a34 = ae[ 14 ];

            const a41 = ae[ 3 ], a42 = ae[ 7 ], a43 = ae[ 11 ], a44 = ae[ 15 ];


            const b11 = be[ 0 ], b12 = be[ 4 ], b13 = be[ 8 ], b14 = be[ 12 ];

            const b21 = be[ 1 ], b22 = be[ 5 ], b23 = be[ 9 ], b24 = be[ 13 ];

            const b31 = be[ 2 ], b32 = be[ 6 ], b33 = be[ 10 ], b34 = be[ 14 ];

            const b41 = be[ 3 ], b42 = be[ 7 ], b43 = be[ 11 ], b44 = be[ 15 ];


            te[ 0 ] = a11 * b11 + a12 * b21 + a13 * b31 + a14 * b41;

            te[ 4 ] = a11 * b12 + a12 * b22 + a13 * b32 + a14 * b42;

            te[ 8 ] = a11 * b13 + a12 * b23 + a13 * b33 + a14 * b43;

            te[ 12 ] = a11 * b14 + a12 * b24 + a13 * b34 + a14 * b44;


            te[ 1 ] = a21 * b11 + a22 * b21 + a23 * b31 + a24 * b41;

            te[ 5 ] = a21 * b12 + a22 * b22 + a23 * b32 + a24 * b42;

            te[ 9 ] = a21 * b13 + a22 * b23 + a23 * b33 + a24 * b43;

            te[ 13 ] = a21 * b14 + a22 * b24 + a23 * b34 + a24 * b44;


            te[ 2 ] = a31 * b11 + a32 * b21 + a33 * b31 + a34 * b41;

            te[ 6 ] = a31 * b12 + a32 * b22 + a33 * b32 + a34 * b42;

            te[ 10 ] = a31 * b13 + a32 * b23 + a33 * b33 + a34 * b43;

            te[ 14 ] = a31 * b14 + a32 * b24 + a33 * b34 + a34 * b44;


            te[ 3 ] = a41 * b11 + a42 * b21 + a43 * b31 + a44 * b41;

            te[ 7 ] = a41 * b12 + a42 * b22 + a43 * b32 + a44 * b42;

            te[ 11 ] = a41 * b13 + a42 * b23 + a43 * b33 + a44 * b43;

            te[ 15 ] = a41 * b14 + a42 * b24 + a43 * b34 + a44 * b44;


            return this;


        }


        multiplyScalar( s ) {


            const te = this.elements;


            te[ 0 ] *= s; te[ 4 ] *= s; te[ 8 ] *= s; te[ 12 ] *= s;

            te[ 1 ] *= s; te[ 5 ] *= s; te[ 9 ] *= s; te[ 13 ] *= s;

            te[ 2 ] *= s; te[ 6 ] *= s; te[ 10 ] *= s; te[ 14 ] *= s;

            te[ 3 ] *= s; te[ 7 ] *= s; te[ 11 ] *= s; te[ 15 ] *= s;


            return this;


        }


        determinant() {


            const te = this.elements;


            const n11 = te[ 0 ], n12 = te[ 4 ], n13 = te[ 8 ], n14 = te[ 12 ];

            const n21 = te[ 1 ], n22 = te[ 5 ], n23 = te[ 9 ], n24 = te[ 13 ];

            const n31 = te[ 2 ], n32 = te[ 6 ], n33 = te[ 10 ], n34 = te[ 14 ];

            const n41 = te[ 3 ], n42 = te[ 7 ], n43 = te[ 11 ], n44 = te[ 15 ];


            //TODO: make this more efficient

            //( based on http://www.euclideanspace.com/maths/algebra/matrix/functions/inverse/fourD/index.htm )


            return (

                n41 * (

                    + n14 * n23 * n32

                     - n13 * n24 * n32

                     - n14 * n22 * n33

                     + n12 * n24 * n33

                     + n13 * n22 * n34

                     - n12 * n23 * n34

                ) +

                n42 * (

                    + n11 * n23 * n34

                     - n11 * n24 * n33

                     + n14 * n21 * n33

                     - n13 * n21 * n34

                     + n13 * n24 * n31

                     - n14 * n23 * n31

                ) +

                n43 * (

                    + n11 * n24 * n32

                     - n11 * n22 * n34

                     - n14 * n21 * n32

                     + n12 * n21 * n34

                     + n14 * n22 * n31

                     - n12 * n24 * n31

                ) +

                n44 * (

                    - n13 * n22 * n31

                     - n11 * n23 * n32

                     + n11 * n22 * n33

                     + n13 * n21 * n32

                     - n12 * n21 * n33

                     + n12 * n23 * n31

                )


            );


        }


        transpose() {


            const te = this.elements;

            let tmp;


            tmp = te[ 1 ]; te[ 1 ] = te[ 4 ]; te[ 4 ] = tmp;

            tmp = te[ 2 ]; te[ 2 ] = te[ 8 ]; te[ 8 ] = tmp;

            tmp = te[ 6 ]; te[ 6 ] = te[ 9 ]; te[ 9 ] = tmp;


            tmp = te[ 3 ]; te[ 3 ] = te[ 12 ]; te[ 12 ] = tmp;

            tmp = te[ 7 ]; te[ 7 ] = te[ 13 ]; te[ 13 ] = tmp;

            tmp = te[ 11 ]; te[ 11 ] = te[ 14 ]; te[ 14 ] = tmp;


            return this;


        }


        setPosition( x, y, z ) {


            const te = this.elements;


            if ( x.isVector3 ) {


                te[ 12 ] = x.x;

                te[ 13 ] = x.y;

                te[ 14 ] = x.z;


            } else {


                te[ 12 ] = x;

                te[ 13 ] = y;

                te[ 14 ] = z;


            }


            return this;


        }


        invert() {


            // based on http://www.euclideanspace.com/maths/algebra/matrix/functions/inverse/fourD/index.htm

            const te = this.elements,


                n11 = te[ 0 ], n21 = te[ 1 ], n31 = te[ 2 ], n41 = te[ 3 ],

                n12 = te[ 4 ], n22 = te[ 5 ], n32 = te[ 6 ], n42 = te[ 7 ],

                n13 = te[ 8 ], n23 = te[ 9 ], n33 = te[ 10 ], n43 = te[ 11 ],

                n14 = te[ 12 ], n24 = te[ 13 ], n34 = te[ 14 ], n44 = te[ 15 ],


                t11 = n23 * n34 * n42 - n24 * n33 * n42 + n24 * n32 * n43 - n22 * n34 * n43 - n23 * n32 * n44 + n22 * n33 * n44,

                t12 = n14 * n33 * n42 - n13 * n34 * n42 - n14 * n32 * n43 + n12 * n34 * n43 + n13 * n32 * n44 - n12 * n33 * n44,

                t13 = n13 * n24 * n42 - n14 * n23 * n42 + n14 * n22 * n43 - n12 * n24 * n43 - n13 * n22 * n44 + n12 * n23 * n44,

                t14 = n14 * n23 * n32 - n13 * n24 * n32 - n14 * n22 * n33 + n12 * n24 * n33 + n13 * n22 * n34 - n12 * n23 * n34;


            const det = n11 * t11 + n21 * t12 + n31 * t13 + n41 * t14;


            if ( det === 0 ) return this.set( 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 );


            const detInv = 1 / det;


            te[ 0 ] = t11 * detInv;

            te[ 1 ] = ( n24 * n33 * n41 - n23 * n34 * n41 - n24 * n31 * n43 + n21 * n34 * n43 + n23 * n31 * n44 - n21 * n33 * n44 ) * detInv;

            te[ 2 ] = ( n22 * n34 * n41 - n24 * n32 * n41 + n24 * n31 * n42 - n21 * n34 * n42 - n22 * n31 * n44 + n21 * n32 * n44 ) * detInv;

            te[ 3 ] = ( n23 * n32 * n41 - n22 * n33 * n41 - n23 * n31 * n42 + n21 * n33 * n42 + n22 * n31 * n43 - n21 * n32 * n43 ) * detInv;


            te[ 4 ] = t12 * detInv;

            te[ 5 ] = ( n13 * n34 * n41 - n14 * n33 * n41 + n14 * n31 * n43 - n11 * n34 * n43 - n13 * n31 * n44 + n11 * n33 * n44 ) * detInv;

            te[ 6 ] = ( n14 * n32 * n41 - n12 * n34 * n41 - n14 * n31 * n42 + n11 * n34 * n42 + n12 * n31 * n44 - n11 * n32 * n44 ) * detInv;

            te[ 7 ] = ( n12 * n33 * n41 - n13 * n32 * n41 + n13 * n31 * n42 - n11 * n33 * n42 - n12 * n31 * n43 + n11 * n32 * n43 ) * detInv;


            te[ 8 ] = t13 * detInv;

            te[ 9 ] = ( n14 * n23 * n41 - n13 * n24 * n41 - n14 * n21 * n43 + n11 * n24 * n43 + n13 * n21 * n44 - n11 * n23 * n44 ) * detInv;

            te[ 10 ] = ( n12 * n24 * n41 - n14 * n22 * n41 + n14 * n21 * n42 - n11 * n24 * n42 - n12 * n21 * n44 + n11 * n22 * n44 ) * detInv;

            te[ 11 ] = ( n13 * n22 * n41 - n12 * n23 * n41 - n13 * n21 * n42 + n11 * n23 * n42 + n12 * n21 * n43 - n11 * n22 * n43 ) * detInv;


            te[ 12 ] = t14 * detInv;

            te[ 13 ] = ( n13 * n24 * n31 - n14 * n23 * n31 + n14 * n21 * n33 - n11 * n24 * n33 - n13 * n21 * n34 + n11 * n23 * n34 ) * detInv;

            te[ 14 ] = ( n14 * n22 * n31 - n12 * n24 * n31 - n14 * n21 * n32 + n11 * n24 * n32 + n12 * n21 * n34 - n11 * n22 * n34 ) * detInv;

            te[ 15 ] = ( n12 * n23 * n31 - n13 * n22 * n31 + n13 * n21 * n32 - n11 * n23 * n32 - n12 * n21 * n33 + n11 * n22 * n33 ) * detInv;


            return this;


        }


        scale( v ) {


            const te = this.elements;

            const x = v.x, y = v.y, z = v.z;


            te[ 0 ] *= x; te[ 4 ] *= y; te[ 8 ] *= z;

            te[ 1 ] *= x; te[ 5 ] *= y; te[ 9 ] *= z;

            te[ 2 ] *= x; te[ 6 ] *= y; te[ 10 ] *= z;

            te[ 3 ] *= x; te[ 7 ] *= y; te[ 11 ] *= z;


            return this;


        }


        getMaxScaleOnAxis() {


            const te = this.elements;


            const scaleXSq = te[ 0 ] * te[ 0 ] + te[ 1 ] * te[ 1 ] + te[ 2 ] * te[ 2 ];

            const scaleYSq = te[ 4 ] * te[ 4 ] + te[ 5 ] * te[ 5 ] + te[ 6 ] * te[ 6 ];

            const scaleZSq = te[ 8 ] * te[ 8 ] + te[ 9 ] * te[ 9 ] + te[ 10 ] * te[ 10 ];


            return Math.sqrt( Math.max( scaleXSq, scaleYSq, scaleZSq ) );


        }


        makeTranslation( x, y, z ) {


            if ( x.isVector3 ) {


                this.set(


                    1, 0, 0, x.x,

                    0, 1, 0, x.y,

                    0, 0, 1, x.z,

                    0, 0, 0, 1


                );


            } else {


                this.set(


                    1, 0, 0, x,

                    0, 1, 0, y,

                    0, 0, 1, z,

                    0, 0, 0, 1


                );


            }


            return this;


        }


        makeRotationX( theta ) {


            const c = Math.cos( theta ), s = Math.sin( theta );


            this.set(


                1, 0, 0, 0,

                0, c, - s, 0,

                0, s, c, 0,

                0, 0, 0, 1


            );


            return this;


        }


        makeRotationY( theta ) {


            const c = Math.cos( theta ), s = Math.sin( theta );


            this.set(


                 c, 0, s, 0,

                 0, 1, 0, 0,

                - s, 0, c, 0,

                 0, 0, 0, 1


            );


            return this;


        }


        makeRotationZ( theta ) {


            const c = Math.cos( theta ), s = Math.sin( theta );


            this.set(


                c, - s, 0, 0,

                s, c, 0, 0,

                0, 0, 1, 0,

                0, 0, 0, 1


            );


            return this;


        }


        makeRotationAxis( axis, angle ) {


            // Based on http://www.gamedev.net/reference/articles/article1199.asp


            const c = Math.cos( angle );

            const s = Math.sin( angle );

            const t = 1 - c;

            const x = axis.x, y = axis.y, z = axis.z;

            const tx = t * x, ty = t * y;


            this.set(


                tx * x + c, tx * y - s * z, tx * z + s * y, 0,

                tx * y + s * z, ty * y + c, ty * z - s * x, 0,

                tx * z - s * y, ty * z + s * x, t * z * z + c, 0,

                0, 0, 0, 1


            );


            return this;


        }


        makeScale( x, y, z ) {


            this.set(


                x, 0, 0, 0,

                0, y, 0, 0,

                0, 0, z, 0,

                0, 0, 0, 1


            );


            return this;


        }


        makeShear( xy, xz, yx, yz, zx, zy ) {


            this.set(


                1, yx, zx, 0,

                xy, 1, zy, 0,

                xz, yz, 1, 0,

                0, 0, 0, 1


            );


            return this;


        }


        compose( position, quaternion, scale ) {


            const te = this.elements;


            const x = quaternion._x, y = quaternion._y, z = quaternion._z, w = quaternion._w;

            const x2 = x + x,   y2 = y + y, z2 = z + z;

            const xx = x * x2, xy = x * y2, xz = x * z2;

            const yy = y * y2, yz = y * z2, zz = z * z2;

            const wx = w * x2, wy = w * y2, wz = w * z2;


            const sx = scale.x, sy = scale.y, sz = scale.z;


            te[ 0 ] = ( 1 - ( yy + zz ) ) * sx;

            te[ 1 ] = ( xy + wz ) * sx;

            te[ 2 ] = ( xz - wy ) * sx;

            te[ 3 ] = 0;


            te[ 4 ] = ( xy - wz ) * sy;

            te[ 5 ] = ( 1 - ( xx + zz ) ) * sy;

            te[ 6 ] = ( yz + wx ) * sy;

            te[ 7 ] = 0;


            te[ 8 ] = ( xz + wy ) * sz;

            te[ 9 ] = ( yz - wx ) * sz;

            te[ 10 ] = ( 1 - ( xx + yy ) ) * sz;

            te[ 11 ] = 0;


            te[ 12 ] = position.x;

            te[ 13 ] = position.y;

            te[ 14 ] = position.z;

            te[ 15 ] = 1;


            return this;


        }


        decompose( position, quaternion, scale ) {


            const te = this.elements;


            let sx = _v1$5.set( te[ 0 ], te[ 1 ], te[ 2 ] ).length();

            const sy = _v1$5.set( te[ 4 ], te[ 5 ], te[ 6 ] ).length();

            const sz = _v1$5.set( te[ 8 ], te[ 9 ], te[ 10 ] ).length();


            // if determine is negative, we need to invert one scale

            const det = this.determinant();

            if ( det < 0 ) sx = - sx;


            position.x = te[ 12 ];

            position.y = te[ 13 ];

            position.z = te[ 14 ];


            // scale the rotation part

            _m1$2.copy( this );


            const invSX = 1 / sx;

            const invSY = 1 / sy;

            const invSZ = 1 / sz;


            _m1$2.elements[ 0 ] *= invSX;

            _m1$2.elements[ 1 ] *= invSX;

            _m1$2.elements[ 2 ] *= invSX;


            _m1$2.elements[ 4 ] *= invSY;

            _m1$2.elements[ 5 ] *= invSY;

            _m1$2.elements[ 6 ] *= invSY;


            _m1$2.elements[ 8 ] *= invSZ;

            _m1$2.elements[ 9 ] *= invSZ;

            _m1$2.elements[ 10 ] *= invSZ;


            quaternion.setFromRotationMatrix( _m1$2 );


            scale.x = sx;

            scale.y = sy;

            scale.z = sz;


            return this;


        }


        makePerspective( left, right, top, bottom, near, far, coordinateSystem = WebGLCoordinateSystem ) {


            const te = this.elements;

            const x = 2 * near / ( right - left );

            const y = 2 * near / ( top - bottom );


            const a = ( right + left ) / ( right - left );

            const b = ( top + bottom ) / ( top - bottom );


            let c, d;


            if ( coordinateSystem === WebGLCoordinateSystem ) {


                c = - ( far + near ) / ( far - near );

                d = ( - 2 * far * near ) / ( far - near );


            } else if ( coordinateSystem === WebGPUCoordinateSystem ) {


                c = - far / ( far - near );

                d = ( - far * near ) / ( far - near );


            } else {


                throw new Error( 'THREE.Matrix4.makePerspective(): Invalid coordinate system: ' + coordinateSystem );


            }


            te[ 0 ] = x;    te[ 4 ] = 0;    te[ 8 ] = a;    te[ 12 ] = 0;

            te[ 1 ] = 0;    te[ 5 ] = y;    te[ 9 ] = b;    te[ 13 ] = 0;

            te[ 2 ] = 0;    te[ 6 ] = 0;    te[ 10 ] = c;   te[ 14 ] = d;

            te[ 3 ] = 0;    te[ 7 ] = 0;    te[ 11 ] = - 1; te[ 15 ] = 0;


            return this;


        }


        makeOrthographic( left, right, top, bottom, near, far, coordinateSystem = WebGLCoordinateSystem ) {


            const te = this.elements;

            const w = 1.0 / ( right - left );

            const h = 1.0 / ( top - bottom );

            const p = 1.0 / ( far - near );


            const x = ( right + left ) * w;

            const y = ( top + bottom ) * h;


            let z, zInv;


            if ( coordinateSystem === WebGLCoordinateSystem ) {


                z = ( far + near ) * p;

                zInv = - 2 * p;


            } else if ( coordinateSystem === WebGPUCoordinateSystem ) {


                z = near * p;

                zInv = - 1 * p;


            } else {


                throw new Error( 'THREE.Matrix4.makeOrthographic(): Invalid coordinate system: ' + coordinateSystem );


            }


            te[ 0 ] = 2 * w;    te[ 4 ] = 0;        te[ 8 ] = 0;        te[ 12 ] = - x;

            te[ 1 ] = 0;        te[ 5 ] = 2 * h;    te[ 9 ] = 0;        te[ 13 ] = - y;

            te[ 2 ] = 0;        te[ 6 ] = 0;        te[ 10 ] = zInv;    te[ 14 ] = - z;

            te[ 3 ] = 0;        te[ 7 ] = 0;        te[ 11 ] = 0;       te[ 15 ] = 1;


            return this;


        }


        equals( matrix ) {


            const te = this.elements;

            const me = matrix.elements;


            for ( let i = 0; i < 16; i ++ ) {


                if ( te[ i ] !== me[ i ] ) return false;


            }


            return true;


        }


        fromArray( array, offset = 0 ) {


            for ( let i = 0; i < 16; i ++ ) {


                this.elements[ i ] = array[ i + offset ];


            }


            return this;


        }


        toArray( array = [], offset = 0 ) {


            const te = this.elements;


            array[ offset ] = te[ 0 ];

            array[ offset + 1 ] = te[ 1 ];

            array[ offset + 2 ] = te[ 2 ];

            array[ offset + 3 ] = te[ 3 ];


            array[ offset + 4 ] = te[ 4 ];

            array[ offset + 5 ] = te[ 5 ];

            array[ offset + 6 ] = te[ 6 ];

            array[ offset + 7 ] = te[ 7 ];


            array[ offset + 8 ] = te[ 8 ];

            array[ offset + 9 ] = te[ 9 ];

            array[ offset + 10 ] = te[ 10 ];

            array[ offset + 11 ] = te[ 11 ];


            array[ offset + 12 ] = te[ 12 ];

            array[ offset + 13 ] = te[ 13 ];

            array[ offset + 14 ] = te[ 14 ];

            array[ offset + 15 ] = te[ 15 ];


            return array;


        }


    }


    const _v1$5 = /*@__PURE__*/ new Vector3();

    const _m1$2 = /*@__PURE__*/ new Matrix4();

    const _zero = /*@__PURE__*/ new Vector3( 0, 0, 0 );

    const _one = /*@__PURE__*/ new Vector3( 1, 1, 1 );

    const _x = /*@__PURE__*/ new Vector3();

    const _y = /*@__PURE__*/ new Vector3();

    const _z = /*@__PURE__*/ new Vector3();


    const _matrix$1 = /*@__PURE__*/ new Matrix4();

    const _quaternion$3 = /*@__PURE__*/ new Quaternion();


    class Euler {


        constructor( x = 0, y = 0, z = 0, order = Euler.DEFAULT_ORDER ) {


            this.isEuler = true;


            this._x = x;

            this._y = y;

            this._z = z;

            this._order = order;


        }


        get x() {


            return this._x;


        }


        set x( value ) {


            this._x = value;

            this._onChangeCallback();


        }


        get y() {


            return this._y;


        }


        set y( value ) {


            this._y = value;

            this._onChangeCallback();


        }


        get z() {


            return this._z;


        }


        set z( value ) {


            this._z = value;

            this._onChangeCallback();


        }


        get order() {


            return this._order;


        }


        set order( value ) {


            this._order = value;

            this._onChangeCallback();


        }


        set( x, y, z, order = this._order ) {


            this._x = x;

            this._y = y;

            this._z = z;

            this._order = order;


            this._onChangeCallback();


            return this;


        }


        clone() {


            return new this.constructor( this._x, this._y, this._z, this._order );


        }


        copy( euler ) {


            this._x = euler._x;

            this._y = euler._y;

            this._z = euler._z;

            this._order = euler._order;


            this._onChangeCallback();


            return this;


        }


        setFromRotationMatrix( m, order = this._order, update = true ) {


            // assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)


            const te = m.elements;

            const m11 = te[ 0 ], m12 = te[ 4 ], m13 = te[ 8 ];

            const m21 = te[ 1 ], m22 = te[ 5 ], m23 = te[ 9 ];

            const m31 = te[ 2 ], m32 = te[ 6 ], m33 = te[ 10 ];


            switch ( order ) {


                case 'XYZ':


                    this._y = Math.asin( clamp( m13, - 1, 1 ) );


                    if ( Math.abs( m13 ) < 0.9999999 ) {


                        this._x = Math.atan2( - m23, m33 );

                        this._z = Math.atan2( - m12, m11 );


                    } else {


                        this._x = Math.atan2( m32, m22 );

                        this._z = 0;


                    }


                    break;


                case 'YXZ':


                    this._x = Math.asin( - clamp( m23, - 1, 1 ) );


                    if ( Math.abs( m23 ) < 0.9999999 ) {


                        this._y = Math.atan2( m13, m33 );

                        this._z = Math.atan2( m21, m22 );


                    } else {


                        this._y = Math.atan2( - m31, m11 );

                        this._z = 0;


                    }


                    break;


                case 'ZXY':


                    this._x = Math.asin( clamp( m32, - 1, 1 ) );


                    if ( Math.abs( m32 ) < 0.9999999 ) {


                        this._y = Math.atan2( - m31, m33 );

                        this._z = Math.atan2( - m12, m22 );


                    } else {


                        this._y = 0;

                        this._z = Math.atan2( m21, m11 );


                    }


                    break;


                case 'ZYX':


                    this._y = Math.asin( - clamp( m31, - 1, 1 ) );


                    if ( Math.abs( m31 ) < 0.9999999 ) {


                        this._x = Math.atan2( m32, m33 );

                        this._z = Math.atan2( m21, m11 );


                    } else {


                        this._x = 0;

                        this._z = Math.atan2( - m12, m22 );


                    }


                    break;


                case 'YZX':


                    this._z = Math.asin( clamp( m21, - 1, 1 ) );


                    if ( Math.abs( m21 ) < 0.9999999 ) {


                        this._x = Math.atan2( - m23, m22 );

                        this._y = Math.atan2( - m31, m11 );


                    } else {


                        this._x = 0;

                        this._y = Math.atan2( m13, m33 );


                    }


                    break;


                case 'XZY':


                    this._z = Math.asin( - clamp( m12, - 1, 1 ) );


                    if ( Math.abs( m12 ) < 0.9999999 ) {


                        this._x = Math.atan2( m32, m22 );

                        this._y = Math.atan2( m13, m11 );


                    } else {


                        this._x = Math.atan2( - m23, m33 );

                        this._y = 0;


                    }


                    break;


                default:


                    console.warn( 'THREE.Euler: .setFromRotationMatrix() encountered an unknown order: ' + order );


            }


            this._order = order;


            if ( update === true ) this._onChangeCallback();


            return this;


        }


        setFromQuaternion( q, order, update ) {


            _matrix$1.makeRotationFromQuaternion( q );


            return this.setFromRotationMatrix( _matrix$1, order, update );


        }


        setFromVector3( v, order = this._order ) {


            return this.set( v.x, v.y, v.z, order );


        }


        reorder( newOrder ) {


            // WARNING: this discards revolution information -bhouston


            _quaternion$3.setFromEuler( this );


            return this.setFromQuaternion( _quaternion$3, newOrder );


        }


        equals( euler ) {


            return ( euler._x === this._x ) && ( euler._y === this._y ) && ( euler._z === this._z ) && ( euler._order === this._order );


        }


        fromArray( array ) {


            this._x = array[ 0 ];

            this._y = array[ 1 ];

            this._z = array[ 2 ];

            if ( array[ 3 ] !== undefined ) this._order = array[ 3 ];


            this._onChangeCallback();


            return this;


        }


        toArray( array = [], offset = 0 ) {


            array[ offset ] = this._x;

            array[ offset + 1 ] = this._y;

            array[ offset + 2 ] = this._z;

            array[ offset + 3 ] = this._order;


            return array;


        }


        _onChange( callback ) {


            this._onChangeCallback = callback;


            return this;


        }


        _onChangeCallback() {}


        *[ Symbol.iterator ]() {


            yield this._x;

            yield this._y;

            yield this._z;

            yield this._order;


        }


    }


    Euler.DEFAULT_ORDER = 'XYZ';


    class Layers {


        constructor() {


            this.mask = 1 | 0;


        }


        set( channel ) {


            this.mask = ( 1 << channel | 0 ) >>> 0;


        }


        enable( channel ) {


            this.mask |= 1 << channel | 0;


        }


        enableAll() {


            this.mask = 0xffffffff | 0;


        }


        toggle( channel ) {


            this.mask ^= 1 << channel | 0;


        }


        disable( channel ) {


            this.mask &= ~ ( 1 << channel | 0 );


        }


        disableAll() {


            this.mask = 0;


        }


        test( layers ) {


            return ( this.mask & layers.mask ) !== 0;


        }


        isEnabled( channel ) {


            return ( this.mask & ( 1 << channel | 0 ) ) !== 0;


        }


    }


    let _object3DId = 0;


    const _v1$4 = /*@__PURE__*/ new Vector3();

    const _q1 = /*@__PURE__*/ new Quaternion();

    const _m1$1 = /*@__PURE__*/ new Matrix4();

    const _target = /*@__PURE__*/ new Vector3();


    const _position$3 = /*@__PURE__*/ new Vector3();

    const _scale$2 = /*@__PURE__*/ new Vector3();

    const _quaternion$2 = /*@__PURE__*/ new Quaternion();


    const _xAxis = /*@__PURE__*/ new Vector3( 1, 0, 0 );

    const _yAxis = /*@__PURE__*/ new Vector3( 0, 1, 0 );

    const _zAxis = /*@__PURE__*/ new Vector3( 0, 0, 1 );


    const _addedEvent = { type: 'added' };

    const _removedEvent = { type: 'removed' };


    class Object3D extends EventDispatcher {


        constructor() {


            super();


            this.isObject3D = true;


            Object.defineProperty( this, 'id', { value: _object3DId ++ } );


            this.uuid = generateUUID();


            this.name = '';

            this.type = 'Object3D';


            this.parent = null;

            this.children = [];


            this.up = Object3D.DEFAULT_UP.clone();


            const position = new Vector3();

            const rotation = new Euler();

            const quaternion = new Quaternion();

            const scale = new Vector3( 1, 1, 1 );


            function onRotationChange() {


                quaternion.setFromEuler( rotation, false );


            }


            function onQuaternionChange() {


                rotation.setFromQuaternion( quaternion, undefined, false );


            }


            rotation._onChange( onRotationChange );

            quaternion._onChange( onQuaternionChange );


            Object.defineProperties( this, {

                position: {

                    configurable: true,

                    enumerable: true,

                    value: position

                },

                rotation: {

                    configurable: true,

                    enumerable: true,

                    value: rotation

                },

                quaternion: {

                    configurable: true,

                    enumerable: true,

                    value: quaternion

                },

                scale: {

                    configurable: true,

                    enumerable: true,

                    value: scale

                },

                modelViewMatrix: {

                    value: new Matrix4()

                },

                normalMatrix: {

                    value: new Matrix3()

                }

            } );


            this.matrix = new Matrix4();

            this.matrixWorld = new Matrix4();


            this.matrixAutoUpdate = Object3D.DEFAULT_MATRIX_AUTO_UPDATE;


            this.matrixWorldAutoUpdate = Object3D.DEFAULT_MATRIX_WORLD_AUTO_UPDATE; // checked by the renderer

            this.matrixWorldNeedsUpdate = false;


            this.layers = new Layers();

            this.visible = true;


            this.castShadow = false;

            this.receiveShadow = false;


            this.frustumCulled = true;

            this.renderOrder = 0;


            this.animations = [];


            this.userData = {};


        }


        onBeforeShadow( /* renderer, object, camera, shadowCamera, geometry, depthMaterial, group */ ) {}


        onAfterShadow( /* renderer, object, camera, shadowCamera, geometry, depthMaterial, group */ ) {}


        onBeforeRender( /* renderer, scene, camera, geometry, material, group */ ) {}


        onAfterRender( /* renderer, scene, camera, geometry, material, group */ ) {}


        applyMatrix4( matrix ) {


            if ( this.matrixAutoUpdate ) this.updateMatrix();


            this.matrix.premultiply( matrix );


            this.matrix.decompose( this.position, this.quaternion, this.scale );


        }


        applyQuaternion( q ) {


            this.quaternion.premultiply( q );


            return this;


        }


        setRotationFromAxisAngle( axis, angle ) {


            // assumes axis is normalized


            this.quaternion.setFromAxisAngle( axis, angle );


        }


        setRotationFromEuler( euler ) {


            this.quaternion.setFromEuler( euler, true );


        }


        setRotationFromMatrix( m ) {


            // assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)


            this.quaternion.setFromRotationMatrix( m );


        }


        setRotationFromQuaternion( q ) {


            // assumes q is normalized


            this.quaternion.copy( q );


        }


        rotateOnAxis( axis, angle ) {


            // rotate object on axis in object space

            // axis is assumed to be normalized


            _q1.setFromAxisAngle( axis, angle );


            this.quaternion.multiply( _q1 );


            return this;


        }


        rotateOnWorldAxis( axis, angle ) {


            // rotate object on axis in world space

            // axis is assumed to be normalized

            // method assumes no rotated parent


            _q1.setFromAxisAngle( axis, angle );


            this.quaternion.premultiply( _q1 );


            return this;


        }


        rotateX( angle ) {


            return this.rotateOnAxis( _xAxis, angle );


        }


        rotateY( angle ) {


            return this.rotateOnAxis( _yAxis, angle );


        }


        rotateZ( angle ) {


            return this.rotateOnAxis( _zAxis, angle );


        }


        translateOnAxis( axis, distance ) {


            // translate object by distance along axis in object space

            // axis is assumed to be normalized


            _v1$4.copy( axis ).applyQuaternion( this.quaternion );


            this.position.add( _v1$4.multiplyScalar( distance ) );


            return this;


        }


        translateX( distance ) {


            return this.translateOnAxis( _xAxis, distance );


        }


        translateY( distance ) {


            return this.translateOnAxis( _yAxis, distance );


        }


        translateZ( distance ) {


            return this.translateOnAxis( _zAxis, distance );


        }


        localToWorld( vector ) {


            this.updateWorldMatrix( true, false );


            return vector.applyMatrix4( this.matrixWorld );


        }


        worldToLocal( vector ) {


            this.updateWorldMatrix( true, false );


            return vector.applyMatrix4( _m1$1.copy( this.matrixWorld ).invert() );


        }


        lookAt( x, y, z ) {


            // This method does not support objects having non-uniformly-scaled parent(s)


            if ( x.isVector3 ) {


                _target.copy( x );


            } else {


                _target.set( x, y, z );


            }


            const parent = this.parent;


            this.updateWorldMatrix( true, false );


            _position$3.setFromMatrixPosition( this.matrixWorld );


            if ( this.isCamera || this.isLight ) {


                _m1$1.lookAt( _position$3, _target, this.up );


            } else {


                _m1$1.lookAt( _target, _position$3, this.up );


            }


            this.quaternion.setFromRotationMatrix( _m1$1 );


            if ( parent ) {


                _m1$1.extractRotation( parent.matrixWorld );

                _q1.setFromRotationMatrix( _m1$1 );

                this.quaternion.premultiply( _q1.invert() );


            }


        }


        add( object ) {


            if ( arguments.length > 1 ) {


                for ( let i = 0; i < arguments.length; i ++ ) {


                    this.add( arguments[ i ] );


                }


                return this;


            }


            if ( object === this ) {


                console.error( 'THREE.Object3D.add: object can\'t be added as a child of itself.', object );

                return this;


            }


            if ( object && object.isObject3D ) {


                if ( object.parent !== null ) {


                    object.parent.remove( object );


                }


                object.parent = this;

                this.children.push( object );


                object.dispatchEvent( _addedEvent );


            } else {


                console.error( 'THREE.Object3D.add: object not an instance of THREE.Object3D.', object );


            }


            return this;


        }


        remove( object ) {


            if ( arguments.length > 1 ) {


                for ( let i = 0; i < arguments.length; i ++ ) {


                    this.remove( arguments[ i ] );


                }


                return this;


            }


            const index = this.children.indexOf( object );


            if ( index !== - 1 ) {


                object.parent = null;

                this.children.splice( index, 1 );


                object.dispatchEvent( _removedEvent );


            }


            return this;


        }


        removeFromParent() {


            const parent = this.parent;


            if ( parent !== null ) {


                parent.remove( this );


            }


            return this;


        }


        clear() {


            return this.remove( ... this.children );


        }


        attach( object ) {


            // adds object as a child of this, while maintaining the object's world transform


            // Note: This method does not support scene graphs having non-uniformly-scaled nodes(s)


            this.updateWorldMatrix( true, false );


            _m1$1.copy( this.matrixWorld ).invert();


            if ( object.parent !== null ) {


                object.parent.updateWorldMatrix( true, false );


                _m1$1.multiply( object.parent.matrixWorld );


            }


            object.applyMatrix4( _m1$1 );


            this.add( object );


            object.updateWorldMatrix( false, true );


            return this;


        }


        getObjectById( id ) {


            return this.getObjectByProperty( 'id', id );


        }


        getObjectByName( name ) {


            return this.getObjectByProperty( 'name', name );


        }


        getObjectByProperty( name, value ) {


            if ( this[ name ] === value ) return this;


            for ( let i = 0, l = this.children.length; i < l; i ++ ) {


                const child = this.children[ i ];

                const object = child.getObjectByProperty( name, value );


                if ( object !== undefined ) {


                    return object;


                }


            }


            return undefined;


        }


        getObjectsByProperty( name, value, result = [] ) {


            if ( this[ name ] === value ) result.push( this );


            const children = this.children;


            for ( let i = 0, l = children.length; i < l; i ++ ) {


                children[ i ].getObjectsByProperty( name, value, result );


            }


            return result;


        }


        getWorldPosition( target ) {


            this.updateWorldMatrix( true, false );


            return target.setFromMatrixPosition( this.matrixWorld );


        }


        getWorldQuaternion( target ) {


            this.updateWorldMatrix( true, false );


            this.matrixWorld.decompose( _position$3, target, _scale$2 );


            return target;


        }


        getWorldScale( target ) {


            this.updateWorldMatrix( true, false );


            this.matrixWorld.decompose( _position$3, _quaternion$2, target );


            return target;


        }


        getWorldDirection( target ) {


            this.updateWorldMatrix( true, false );


            const e = this.matrixWorld.elements;


            return target.set( e[ 8 ], e[ 9 ], e[ 10 ] ).normalize();


        }


        raycast( /* raycaster, intersects */ ) {}


        traverse( callback ) {


            callback( this );


            const children = this.children;


            for ( let i = 0, l = children.length; i < l; i ++ ) {


                children[ i ].traverse( callback );


            }


        }


        traverseVisible( callback ) {


            if ( this.visible === false ) return;


            callback( this );


            const children = this.children;


            for ( let i = 0, l = children.length; i < l; i ++ ) {


                children[ i ].traverseVisible( callback );


            }


        }


        traverseAncestors( callback ) {


            const parent = this.parent;


            if ( parent !== null ) {


                callback( parent );


                parent.traverseAncestors( callback );


            }


        }


        updateMatrix() {


            this.matrix.compose( this.position, this.quaternion, this.scale );


            this.matrixWorldNeedsUpdate = true;


        }


        updateMatrixWorld( force ) {


            if ( this.matrixAutoUpdate ) this.updateMatrix();


            if ( this.matrixWorldNeedsUpdate || force ) {


                if ( this.parent === null ) {


                    this.matrixWorld.copy( this.matrix );


                } else {


                    this.matrixWorld.multiplyMatrices( this.parent.matrixWorld, this.matrix );


                }


                this.matrixWorldNeedsUpdate = false;


                force = true;


            }


            // update children


            const children = this.children;


            for ( let i = 0, l = children.length; i < l; i ++ ) {


                const child = children[ i ];


                if ( child.matrixWorldAutoUpdate === true || force === true ) {


                    child.updateMatrixWorld( force );


                }


            }


        }


        updateWorldMatrix( updateParents, updateChildren ) {


            const parent = this.parent;


            if ( updateParents === true && parent !== null && parent.matrixWorldAutoUpdate === true ) {


                parent.updateWorldMatrix( true, false );


            }


            if ( this.matrixAutoUpdate ) this.updateMatrix();


            if ( this.parent === null ) {


                this.matrixWorld.copy( this.matrix );


            } else {


                this.matrixWorld.multiplyMatrices( this.parent.matrixWorld, this.matrix );


            }


            // update children


            if ( updateChildren === true ) {


                const children = this.children;


                for ( let i = 0, l = children.length; i < l; i ++ ) {


                    const child = children[ i ];


                    if ( child.matrixWorldAutoUpdate === true ) {


                        child.updateWorldMatrix( false, true );


                    }


                }


            }


        }


        toJSON( meta ) {


            // meta is a string when called from JSON.stringify

            const isRootObject = ( meta === undefined || typeof meta === 'string' );


            const output = {};


            // meta is a hash used to collect geometries, materials.

            // not providing it implies that this is the root object

            // being serialized.

            if ( isRootObject ) {


                // initialize meta obj

                meta = {

                    geometries: {},

                    materials: {},

                    textures: {},

                    images: {},

                    shapes: {},

                    skeletons: {},

                    animations: {},

                    nodes: {}

                };


                output.metadata = {

                    version: 4.6,

                    type: 'Object',

                    generator: 'Object3D.toJSON'

                };


            }


            // standard Object3D serialization


            const object = {};


            object.uuid = this.uuid;

            object.type = this.type;


            if ( this.name !== '' ) object.name = this.name;

            if ( this.castShadow === true ) object.castShadow = true;

            if ( this.receiveShadow === true ) object.receiveShadow = true;

            if ( this.visible === false ) object.visible = false;

            if ( this.frustumCulled === false ) object.frustumCulled = false;

            if ( this.renderOrder !== 0 ) object.renderOrder = this.renderOrder;

            if ( Object.keys( this.userData ).length > 0 ) object.userData = this.userData;


            object.layers = this.layers.mask;

            object.matrix = this.matrix.toArray();

            object.up = this.up.toArray();


            if ( this.matrixAutoUpdate === false ) object.matrixAutoUpdate = false;


            // object specific properties


            if ( this.isInstancedMesh ) {


                object.type = 'InstancedMesh';

                object.count = this.count;

                object.instanceMatrix = this.instanceMatrix.toJSON();

                if ( this.instanceColor !== null ) object.instanceColor = this.instanceColor.toJSON();


            }


            if ( this.isBatchedMesh ) {


                object.type = 'BatchedMesh';

                object.perObjectFrustumCulled = this.perObjectFrustumCulled;

                object.sortObjects = this.sortObjects;


                object.drawRanges = this._drawRanges;

                object.reservedRanges = this._reservedRanges;


                object.visibility = this._visibility;

                object.active = this._active;

                object.bounds = this._bounds.map( bound => ( {

                    boxInitialized: bound.boxInitialized,

                    boxMin: bound.box.min.toArray(),

                    boxMax: bound.box.max.toArray(),


                    sphereInitialized: bound.sphereInitialized,

                    sphereRadius: bound.sphere.radius,

                    sphereCenter: bound.sphere.center.toArray()

                } ) );


                object.maxGeometryCount = this._maxGeometryCount;

                object.maxVertexCount = this._maxVertexCount;

                object.maxIndexCount = this._maxIndexCount;


                object.geometryInitialized = this._geometryInitialized;

                object.geometryCount = this._geometryCount;


                object.matricesTexture = this._matricesTexture.toJSON( meta );


                if ( this.boundingSphere !== null ) {


                    object.boundingSphere = {

                        center: object.boundingSphere.center.toArray(),

                        radius: object.boundingSphere.radius

                    };


                }


                if ( this.boundingBox !== null ) {


                    object.boundingBox = {

                        min: object.boundingBox.min.toArray(),

                        max: object.boundingBox.max.toArray()

                    };


                }


            }


            //


            function serialize( library, element ) {


                if ( library[ element.uuid ] === undefined ) {


                    library[ element.uuid ] = element.toJSON( meta );


                }


                return element.uuid;


            }


            if ( this.isScene ) {


                if ( this.background ) {


                    if ( this.background.isColor ) {


                        object.background = this.background.toJSON();


                    } else if ( this.background.isTexture ) {


                        object.background = this.background.toJSON( meta ).uuid;


                    }


                }


                if ( this.environment && this.environment.isTexture && this.environment.isRenderTargetTexture !== true ) {


                    object.environment = this.environment.toJSON( meta ).uuid;


                }


            } else if ( this.isMesh || this.isLine || this.isPoints ) {


                object.geometry = serialize( meta.geometries, this.geometry );


                const parameters = this.geometry.parameters;


                if ( parameters !== undefined && parameters.shapes !== undefined ) {


                    const shapes = parameters.shapes;


                    if ( Array.isArray( shapes ) ) {


                        for ( let i = 0, l = shapes.length; i < l; i ++ ) {


                            const shape = shapes[ i ];


                            serialize( meta.shapes, shape );


                        }


                    } else {


                        serialize( meta.shapes, shapes );


                    }


                }


            }


            if ( this.isSkinnedMesh ) {


                object.bindMode = this.bindMode;

                object.bindMatrix = this.bindMatrix.toArray();


                if ( this.skeleton !== undefined ) {


                    serialize( meta.skeletons, this.skeleton );


                    object.skeleton = this.skeleton.uuid;


                }


            }


            if ( this.material !== undefined ) {


                if ( Array.isArray( this.material ) ) {


                    const uuids = [];


                    for ( let i = 0, l = this.material.length; i < l; i ++ ) {


                        uuids.push( serialize( meta.materials, this.material[ i ] ) );


                    }


                    object.material = uuids;


                } else {


                    object.material = serialize( meta.materials, this.material );


                }


            }


            //


            if ( this.children.length > 0 ) {


                object.children = [];


                for ( let i = 0; i < this.children.length; i ++ ) {


                    object.children.push( this.children[ i ].toJSON( meta ).object );


                }


            }


            //


            if ( this.animations.length > 0 ) {


                object.animations = [];


                for ( let i = 0; i < this.animations.length; i ++ ) {


                    const animation = this.animations[ i ];


                    object.animations.push( serialize( meta.animations, animation ) );


                }


            }


            if ( isRootObject ) {


                const geometries = extractFromCache( meta.geometries );

                const materials = extractFromCache( meta.materials );

                const textures = extractFromCache( meta.textures );

                const images = extractFromCache( meta.images );

                const shapes = extractFromCache( meta.shapes );

                const skeletons = extractFromCache( meta.skeletons );

                const animations = extractFromCache( meta.animations );

                const nodes = extractFromCache( meta.nodes );


                if ( geometries.length > 0 ) output.geometries = geometries;

                if ( materials.length > 0 ) output.materials = materials;

                if ( textures.length > 0 ) output.textures = textures;

                if ( images.length > 0 ) output.images = images;

                if ( shapes.length > 0 ) output.shapes = shapes;

                if ( skeletons.length > 0 ) output.skeletons = skeletons;

                if ( animations.length > 0 ) output.animations = animations;

                if ( nodes.length > 0 ) output.nodes = nodes;


            }


            output.object = object;


            return output;


            // extract data from the cache hash

            // remove metadata on each item

            // and return as array

            function extractFromCache( cache ) {


                const values = [];

                for ( const key in cache ) {


                    const data = cache[ key ];

                    delete data.metadata;

                    values.push( data );


                }


                return values;


            }


        }


        clone( recursive ) {


            return new this.constructor().copy( this, recursive );


        }


        copy( source, recursive = true ) {


            this.name = source.name;


            this.up.copy( source.up );


            this.position.copy( source.position );

            this.rotation.order = source.rotation.order;

            this.quaternion.copy( source.quaternion );

            this.scale.copy( source.scale );


            this.matrix.copy( source.matrix );

            this.matrixWorld.copy( source.matrixWorld );


            this.matrixAutoUpdate = source.matrixAutoUpdate;


            this.matrixWorldAutoUpdate = source.matrixWorldAutoUpdate;

            this.matrixWorldNeedsUpdate = source.matrixWorldNeedsUpdate;


            this.layers.mask = source.layers.mask;

            this.visible = source.visible;


            this.castShadow = source.castShadow;

            this.receiveShadow = source.receiveShadow;


            this.frustumCulled = source.frustumCulled;

            this.renderOrder = source.renderOrder;


            this.animations = source.animations.slice();


            this.userData = JSON.parse( JSON.stringify( source.userData ) );


            if ( recursive === true ) {


                for ( let i = 0; i < source.children.length; i ++ ) {


                    const child = source.children[ i ];

                    this.add( child.clone() );


                }


            }


            return this;


        }


    }


    Object3D.DEFAULT_UP = /*@__PURE__*/ new Vector3( 0, 1, 0 );

    Object3D.DEFAULT_MATRIX_AUTO_UPDATE = true;

    Object3D.DEFAULT_MATRIX_WORLD_AUTO_UPDATE = true;


    const _v0$1 = /*@__PURE__*/ new Vector3();

    const _v1$3 = /*@__PURE__*/ new Vector3();

    const _v2$2 = /*@__PURE__*/ new Vector3();

    const _v3$1 = /*@__PURE__*/ new Vector3();


    const _vab = /*@__PURE__*/ new Vector3();

    const _vac = /*@__PURE__*/ new Vector3();

    const _vbc = /*@__PURE__*/ new Vector3();

    const _vap = /*@__PURE__*/ new Vector3();

    const _vbp = /*@__PURE__*/ new Vector3();

    const _vcp = /*@__PURE__*/ new Vector3();


    let warnedGetUV = false;


    class Triangle {


        constructor( a = new Vector3(), b = new Vector3(), c = new Vector3() ) {


            this.a = a;

            this.b = b;

            this.c = c;


        }


        static getNormal( a, b, c, target ) {


            target.subVectors( c, b );

            _v0$1.subVectors( a, b );

            target.cross( _v0$1 );


            const targetLengthSq = target.lengthSq();

            if ( targetLengthSq > 0 ) {


                return target.multiplyScalar( 1 / Math.sqrt( targetLengthSq ) );


            }


            return target.set( 0, 0, 0 );


        }


        // static/instance method to calculate barycentric coordinates

        // based on: http://www.blackpawn.com/texts/pointinpoly/default.html

        static getBarycoord( point, a, b, c, target ) {


            _v0$1.subVectors( c, a );

            _v1$3.subVectors( b, a );

            _v2$2.subVectors( point, a );


            const dot00 = _v0$1.dot( _v0$1 );

            const dot01 = _v0$1.dot( _v1$3 );

            const dot02 = _v0$1.dot( _v2$2 );

            const dot11 = _v1$3.dot( _v1$3 );

            const dot12 = _v1$3.dot( _v2$2 );


            const denom = ( dot00 * dot11 - dot01 * dot01 );


            // collinear or singular triangle

            if ( denom === 0 ) {


                target.set( 0, 0, 0 );

                return null;


            }


            const invDenom = 1 / denom;

            const u = ( dot11 * dot02 - dot01 * dot12 ) * invDenom;

            const v = ( dot00 * dot12 - dot01 * dot02 ) * invDenom;


            // barycentric coordinates must always sum to 1

            return target.set( 1 - u - v, v, u );


        }


        static containsPoint( point, a, b, c ) {


            // if the triangle is degenerate then we can't contain a point

            if ( this.getBarycoord( point, a, b, c, _v3$1 ) === null ) {


                return false;


            }


            return ( _v3$1.x >= 0 ) && ( _v3$1.y >= 0 ) && ( ( _v3$1.x + _v3$1.y ) <= 1 );


        }


        static getUV( point, p1, p2, p3, uv1, uv2, uv3, target ) { // @deprecated, r151


            if ( warnedGetUV === false ) {


                console.warn( 'THREE.Triangle.getUV() has been renamed to THREE.Triangle.getInterpolation().' );


                warnedGetUV = true;


            }


            return this.getInterpolation( point, p1, p2, p3, uv1, uv2, uv3, target );


        }


        static getInterpolation( point, p1, p2, p3, v1, v2, v3, target ) {


            if ( this.getBarycoord( point, p1, p2, p3, _v3$1 ) === null ) {


                target.x = 0;

                target.y = 0;

                if ( 'z' in target ) target.z = 0;

                if ( 'w' in target ) target.w = 0;

                return null;


            }


            target.setScalar( 0 );

            target.addScaledVector( v1, _v3$1.x );

            target.addScaledVector( v2, _v3$1.y );

            target.addScaledVector( v3, _v3$1.z );


            return target;


        }


        static isFrontFacing( a, b, c, direction ) {


            _v0$1.subVectors( c, b );

            _v1$3.subVectors( a, b );


            // strictly front facing

            return ( _v0$1.cross( _v1$3 ).dot( direction ) < 0 ) ? true : false;


        }


        set( a, b, c ) {


            this.a.copy( a );

            this.b.copy( b );

            this.c.copy( c );


            return this;


        }


        setFromPointsAndIndices( points, i0, i1, i2 ) {


            this.a.copy( points[ i0 ] );

            this.b.copy( points[ i1 ] );

            this.c.copy( points[ i2 ] );


            return this;


        }


        setFromAttributeAndIndices( attribute, i0, i1, i2 ) {


            this.a.fromBufferAttribute( attribute, i0 );

            this.b.fromBufferAttribute( attribute, i1 );

            this.c.fromBufferAttribute( attribute, i2 );


            return this;


        }


        clone() {


            return new this.constructor().copy( this );


        }


        copy( triangle ) {


            this.a.copy( triangle.a );

            this.b.copy( triangle.b );

            this.c.copy( triangle.c );


            return this;


        }


        getArea() {


            _v0$1.subVectors( this.c, this.b );

            _v1$3.subVectors( this.a, this.b );


            return _v0$1.cross( _v1$3 ).length() * 0.5;


        }


        getMidpoint( target ) {


            return target.addVectors( this.a, this.b ).add( this.c ).multiplyScalar( 1 / 3 );


        }


        getNormal( target ) {


            return Triangle.getNormal( this.a, this.b, this.c, target );


        }


        getPlane( target ) {


            return target.setFromCoplanarPoints( this.a, this.b, this.c );


        }


        getBarycoord( point, target ) {


            return Triangle.getBarycoord( point, this.a, this.b, this.c, target );


        }


        getUV( point, uv1, uv2, uv3, target ) { // @deprecated, r151


            if ( warnedGetUV === false ) {


                console.warn( 'THREE.Triangle.getUV() has been renamed to THREE.Triangle.getInterpolation().' );


                warnedGetUV = true;


            }


            return Triangle.getInterpolation( point, this.a, this.b, this.c, uv1, uv2, uv3, target );


        }


        getInterpolation( point, v1, v2, v3, target ) {


            return Triangle.getInterpolation( point, this.a, this.b, this.c, v1, v2, v3, target );


        }


        containsPoint( point ) {


            return Triangle.containsPoint( point, this.a, this.b, this.c );


        }


        isFrontFacing( direction ) {


            return Triangle.isFrontFacing( this.a, this.b, this.c, direction );


        }


        intersectsBox( box ) {


            return box.intersectsTriangle( this );


        }


        closestPointToPoint( p, target ) {


            const a = this.a, b = this.b, c = this.c;

            let v, w;


            // algorithm thanks to Real-Time Collision Detection by Christer Ericson,

            // published by Morgan Kaufmann Publishers, (c) 2005 Elsevier Inc.,

            // under the accompanying license; see chapter 5.1.5 for detailed explanation.

            // basically, we're distinguishing which of the voronoi regions of the triangle

            // the point lies in with the minimum amount of redundant computation.


            _vab.subVectors( b, a );

            _vac.subVectors( c, a );

            _vap.subVectors( p, a );

            const d1 = _vab.dot( _vap );

            const d2 = _vac.dot( _vap );

            if ( d1 <= 0 && d2 <= 0 ) {


                // vertex region of A; barycentric coords (1, 0, 0)

                return target.copy( a );


            }


            _vbp.subVectors( p, b );

            const d3 = _vab.dot( _vbp );

            const d4 = _vac.dot( _vbp );

            if ( d3 >= 0 && d4 <= d3 ) {


                // vertex region of B; barycentric coords (0, 1, 0)

                return target.copy( b );


            }


            const vc = d1 * d4 - d3 * d2;

            if ( vc <= 0 && d1 >= 0 && d3 <= 0 ) {


                v = d1 / ( d1 - d3 );

                // edge region of AB; barycentric coords (1-v, v, 0)

                return target.copy( a ).addScaledVector( _vab, v );


            }


            _vcp.subVectors( p, c );

            const d5 = _vab.dot( _vcp );

            const d6 = _vac.dot( _vcp );

            if ( d6 >= 0 && d5 <= d6 ) {


                // vertex region of C; barycentric coords (0, 0, 1)

                return target.copy( c );


            }


            const vb = d5 * d2 - d1 * d6;

            if ( vb <= 0 && d2 >= 0 && d6 <= 0 ) {


                w = d2 / ( d2 - d6 );

                // edge region of AC; barycentric coords (1-w, 0, w)

                return target.copy( a ).addScaledVector( _vac, w );


            }


            const va = d3 * d6 - d5 * d4;

            if ( va <= 0 && ( d4 - d3 ) >= 0 && ( d5 - d6 ) >= 0 ) {


                _vbc.subVectors( c, b );

                w = ( d4 - d3 ) / ( ( d4 - d3 ) + ( d5 - d6 ) );

                // edge region of BC; barycentric coords (0, 1-w, w)

                return target.copy( b ).addScaledVector( _vbc, w ); // edge region of BC


            }


            // face region

            const denom = 1 / ( va + vb + vc );

            // u = va * denom

            v = vb * denom;

            w = vc * denom;


            return target.copy( a ).addScaledVector( _vab, v ).addScaledVector( _vac, w );


        }


        equals( triangle ) {


            return triangle.a.equals( this.a ) && triangle.b.equals( this.b ) && triangle.c.equals( this.c );


        }


    }


    const _colorKeywords = { 'aliceblue': 0xF0F8FF, 'antiquewhite': 0xFAEBD7, 'aqua': 0x00FFFF, 'aquamarine': 0x7FFFD4, 'azure': 0xF0FFFF,

        'beige': 0xF5F5DC, 'bisque': 0xFFE4C4, 'black': 0x000000, 'blanchedalmond': 0xFFEBCD, 'blue': 0x0000FF, 'blueviolet': 0x8A2BE2,

        'brown': 0xA52A2A, 'burlywood': 0xDEB887, 'cadetblue': 0x5F9EA0, 'chartreuse': 0x7FFF00, 'chocolate': 0xD2691E, 'coral': 0xFF7F50,

        'cornflowerblue': 0x6495ED, 'cornsilk': 0xFFF8DC, 'crimson': 0xDC143C, 'cyan': 0x00FFFF, 'darkblue': 0x00008B, 'darkcyan': 0x008B8B,

        'darkgoldenrod': 0xB8860B, 'darkgray': 0xA9A9A9, 'darkgreen': 0x006400, 'darkgrey': 0xA9A9A9, 'darkkhaki': 0xBDB76B, 'darkmagenta': 0x8B008B,

        'darkolivegreen': 0x556B2F, 'darkorange': 0xFF8C00, 'darkorchid': 0x9932CC, 'darkred': 0x8B0000, 'darksalmon': 0xE9967A, 'darkseagreen': 0x8FBC8F,

        'darkslateblue': 0x483D8B, 'darkslategray': 0x2F4F4F, 'darkslategrey': 0x2F4F4F, 'darkturquoise': 0x00CED1, 'darkviolet': 0x9400D3,

        'deeppink': 0xFF1493, 'deepskyblue': 0x00BFFF, 'dimgray': 0x696969, 'dimgrey': 0x696969, 'dodgerblue': 0x1E90FF, 'firebrick': 0xB22222,

        'floralwhite': 0xFFFAF0, 'forestgreen': 0x228B22, 'fuchsia': 0xFF00FF, 'gainsboro': 0xDCDCDC, 'ghostwhite': 0xF8F8FF, 'gold': 0xFFD700,

        'goldenrod': 0xDAA520, 'gray': 0x808080, 'green': 0x008000, 'greenyellow': 0xADFF2F, 'grey': 0x808080, 'honeydew': 0xF0FFF0, 'hotpink': 0xFF69B4,

        'indianred': 0xCD5C5C, 'indigo': 0x4B0082, 'ivory': 0xFFFFF0, 'khaki': 0xF0E68C, 'lavender': 0xE6E6FA, 'lavenderblush': 0xFFF0F5, 'lawngreen': 0x7CFC00,

        'lemonchiffon': 0xFFFACD, 'lightblue': 0xADD8E6, 'lightcoral': 0xF08080, 'lightcyan': 0xE0FFFF, 'lightgoldenrodyellow': 0xFAFAD2, 'lightgray': 0xD3D3D3,

        'lightgreen': 0x90EE90, 'lightgrey': 0xD3D3D3, 'lightpink': 0xFFB6C1, 'lightsalmon': 0xFFA07A, 'lightseagreen': 0x20B2AA, 'lightskyblue': 0x87CEFA,

        'lightslategray': 0x778899, 'lightslategrey': 0x778899, 'lightsteelblue': 0xB0C4DE, 'lightyellow': 0xFFFFE0, 'lime': 0x00FF00, 'limegreen': 0x32CD32,

        'linen': 0xFAF0E6, 'magenta': 0xFF00FF, 'maroon': 0x800000, 'mediumaquamarine': 0x66CDAA, 'mediumblue': 0x0000CD, 'mediumorchid': 0xBA55D3,

        'mediumpurple': 0x9370DB, 'mediumseagreen': 0x3CB371, 'mediumslateblue': 0x7B68EE, 'mediumspringgreen': 0x00FA9A, 'mediumturquoise': 0x48D1CC,

        'mediumvioletred': 0xC71585, 'midnightblue': 0x191970, 'mintcream': 0xF5FFFA, 'mistyrose': 0xFFE4E1, 'moccasin': 0xFFE4B5, 'navajowhite': 0xFFDEAD,

        'navy': 0x000080, 'oldlace': 0xFDF5E6, 'olive': 0x808000, 'olivedrab': 0x6B8E23, 'orange': 0xFFA500, 'orangered': 0xFF4500, 'orchid': 0xDA70D6,

        'palegoldenrod': 0xEEE8AA, 'palegreen': 0x98FB98, 'paleturquoise': 0xAFEEEE, 'palevioletred': 0xDB7093, 'papayawhip': 0xFFEFD5, 'peachpuff': 0xFFDAB9,

        'peru': 0xCD853F, 'pink': 0xFFC0CB, 'plum': 0xDDA0DD, 'powderblue': 0xB0E0E6, 'purple': 0x800080, 'rebeccapurple': 0x663399, 'red': 0xFF0000, 'rosybrown': 0xBC8F8F,

        'royalblue': 0x4169E1, 'saddlebrown': 0x8B4513, 'salmon': 0xFA8072, 'sandybrown': 0xF4A460, 'seagreen': 0x2E8B57, 'seashell': 0xFFF5EE,

        'sienna': 0xA0522D, 'silver': 0xC0C0C0, 'skyblue': 0x87CEEB, 'slateblue': 0x6A5ACD, 'slategray': 0x708090, 'slategrey': 0x708090, 'snow': 0xFFFAFA,

        'springgreen': 0x00FF7F, 'steelblue': 0x4682B4, 'tan': 0xD2B48C, 'teal': 0x008080, 'thistle': 0xD8BFD8, 'tomato': 0xFF6347, 'turquoise': 0x40E0D0,

        'violet': 0xEE82EE, 'wheat': 0xF5DEB3, 'white': 0xFFFFFF, 'whitesmoke': 0xF5F5F5, 'yellow': 0xFFFF00, 'yellowgreen': 0x9ACD32 };


    const _hslA = { h: 0, s: 0, l: 0 };

    const _hslB = { h: 0, s: 0, l: 0 };


    function hue2rgb( p, q, t ) {


        if ( t < 0 ) t += 1;

        if ( t > 1 ) t -= 1;

        if ( t < 1 / 6 ) return p + ( q - p ) * 6 * t;

        if ( t < 1 / 2 ) return q;

        if ( t < 2 / 3 ) return p + ( q - p ) * 6 * ( 2 / 3 - t );

        return p;


    }


    class Color {


        constructor( r, g, b ) {


            this.isColor = true;


            this.r = 1;

            this.g = 1;

            this.b = 1;


            return this.set( r, g, b );


        }


        set( r, g, b ) {


            if ( g === undefined && b === undefined ) {


                // r is THREE.Color, hex or string


                const value = r;


                if ( value && value.isColor ) {


                    this.copy( value );


                } else if ( typeof value === 'number' ) {


                    this.setHex( value );


                } else if ( typeof value === 'string' ) {


                    this.setStyle( value );


                }


            } else {


                this.setRGB( r, g, b );


            }


            return this;


        }


        setScalar( scalar ) {


            this.r = scalar;

            this.g = scalar;

            this.b = scalar;


            return this;


        }


        setHex( hex, colorSpace = SRGBColorSpace ) {


            hex = Math.floor( hex );


            this.r = ( hex >> 16 & 255 ) / 255;

            this.g = ( hex >> 8 & 255 ) / 255;

            this.b = ( hex & 255 ) / 255;


            ColorManagement.toWorkingColorSpace( this, colorSpace );


            return this;


        }


        setRGB( r, g, b, colorSpace = ColorManagement.workingColorSpace ) {


            this.r = r;

            this.g = g;

            this.b = b;


            ColorManagement.toWorkingColorSpace( this, colorSpace );


            return this;


        }


        setHSL( h, s, l, colorSpace = ColorManagement.workingColorSpace ) {


            // h,s,l ranges are in 0.0 - 1.0

            h = euclideanModulo( h, 1 );

            s = clamp( s, 0, 1 );

            l = clamp( l, 0, 1 );


            if ( s === 0 ) {


                this.r = this.g = this.b = l;


            } else {


                const p = l <= 0.5 ? l * ( 1 + s ) : l + s - ( l * s );

                const q = ( 2 * l ) - p;


                this.r = hue2rgb( q, p, h + 1 / 3 );

                this.g = hue2rgb( q, p, h );

                this.b = hue2rgb( q, p, h - 1 / 3 );


            }


            ColorManagement.toWorkingColorSpace( this, colorSpace );


            return this;


        }


        setStyle( style, colorSpace = SRGBColorSpace ) {


            function handleAlpha( string ) {


                if ( string === undefined ) return;


                if ( parseFloat( string ) < 1 ) {


                    console.warn( 'THREE.Color: Alpha component of ' + style + ' will be ignored.' );


                }


            }


            let m;


            if ( m = /^(\w+)\(([^\)]*)\)/.exec( style ) ) {


                // rgb / hsl


                let color;

                const name = m[ 1 ];

                const components = m[ 2 ];


                switch ( name ) {


                    case 'rgb':

                    case 'rgba':


                        if ( color = /^\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(?:,\s*(\d*\.?\d+)\s*)?$/.exec( components ) ) {


                            // rgb(255,0,0) rgba(255,0,0,0.5)


                            handleAlpha( color[ 4 ] );


                            return this.setRGB(

                                Math.min( 255, parseInt( color[ 1 ], 10 ) ) / 255,

                                Math.min( 255, parseInt( color[ 2 ], 10 ) ) / 255,

                                Math.min( 255, parseInt( color[ 3 ], 10 ) ) / 255,

                                colorSpace

                            );


                        }


                        if ( color = /^\s*(\d+)\%\s*,\s*(\d+)\%\s*,\s*(\d+)\%\s*(?:,\s*(\d*\.?\d+)\s*)?$/.exec( components ) ) {


                            // rgb(100%,0%,0%) rgba(100%,0%,0%,0.5)


                            handleAlpha( color[ 4 ] );


                            return this.setRGB(

                                Math.min( 100, parseInt( color[ 1 ], 10 ) ) / 100,

                                Math.min( 100, parseInt( color[ 2 ], 10 ) ) / 100,

                                Math.min( 100, parseInt( color[ 3 ], 10 ) ) / 100,

                                colorSpace

                            );


                        }


                        break;


                    case 'hsl':

                    case 'hsla':


                        if ( color = /^\s*(\d*\.?\d+)\s*,\s*(\d*\.?\d+)\%\s*,\s*(\d*\.?\d+)\%\s*(?:,\s*(\d*\.?\d+)\s*)?$/.exec( components ) ) {


                            // hsl(120,50%,50%) hsla(120,50%,50%,0.5)


                            handleAlpha( color[ 4 ] );


                            return this.setHSL(

                                parseFloat( color[ 1 ] ) / 360,

                                parseFloat( color[ 2 ] ) / 100,

                                parseFloat( color[ 3 ] ) / 100,

                                colorSpace

                            );


                        }


                        break;


                    default:


                        console.warn( 'THREE.Color: Unknown color model ' + style );


                }


            } else if ( m = /^\#([A-Fa-f\d]+)$/.exec( style ) ) {


                // hex color


                const hex = m[ 1 ];

                const size = hex.length;


                if ( size === 3 ) {


                    // #ff0

                    return this.setRGB(

                        parseInt( hex.charAt( 0 ), 16 ) / 15,

                        parseInt( hex.charAt( 1 ), 16 ) / 15,

                        parseInt( hex.charAt( 2 ), 16 ) / 15,

                        colorSpace

                    );


                } else if ( size === 6 ) {


                    // #ff0000

                    return this.setHex( parseInt( hex, 16 ), colorSpace );


                } else {


                    console.warn( 'THREE.Color: Invalid hex color ' + style );


                }


            } else if ( style && style.length > 0 ) {


                return this.setColorName( style, colorSpace );


            }


            return this;


        }


        setColorName( style, colorSpace = SRGBColorSpace ) {


            // color keywords

            const hex = _colorKeywords[ style.toLowerCase() ];


            if ( hex !== undefined ) {


                // red

                this.setHex( hex, colorSpace );


            } else {


                // unknown color

                console.warn( 'THREE.Color: Unknown color ' + style );


            }


            return this;


        }


        clone() {


            return new this.constructor( this.r, this.g, this.b );


        }


        copy( color ) {


            this.r = color.r;

            this.g = color.g;

            this.b = color.b;


            return this;


        }


        copySRGBToLinear( color ) {


            this.r = SRGBToLinear( color.r );

            this.g = SRGBToLinear( color.g );

            this.b = SRGBToLinear( color.b );


            return this;


        }


        copyLinearToSRGB( color ) {


            this.r = LinearToSRGB( color.r );

            this.g = LinearToSRGB( color.g );

            this.b = LinearToSRGB( color.b );


            return this;


        }


        convertSRGBToLinear() {


            this.copySRGBToLinear( this );


            return this;


        }


        convertLinearToSRGB() {


            this.copyLinearToSRGB( this );


            return this;


        }


        getHex( colorSpace = SRGBColorSpace ) {


            ColorManagement.fromWorkingColorSpace( _color.copy( this ), colorSpace );


            return Math.round( clamp( _color.r * 255, 0, 255 ) ) * 65536 + Math.round( clamp( _color.g * 255, 0, 255 ) ) * 256 + Math.round( clamp( _color.b * 255, 0, 255 ) );


        }


        getHexString( colorSpace = SRGBColorSpace ) {


            return ( '000000' + this.getHex( colorSpace ).toString( 16 ) ).slice( - 6 );


        }


        getHSL( target, colorSpace = ColorManagement.workingColorSpace ) {


            // h,s,l ranges are in 0.0 - 1.0


            ColorManagement.fromWorkingColorSpace( _color.copy( this ), colorSpace );


            const r = _color.r, g = _color.g, b = _color.b;


            const max = Math.max( r, g, b );

            const min = Math.min( r, g, b );


            let hue, saturation;

            const lightness = ( min + max ) / 2.0;


            if ( min === max ) {


                hue = 0;

                saturation = 0;


            } else {


                const delta = max - min;


                saturation = lightness <= 0.5 ? delta / ( max + min ) : delta / ( 2 - max - min );


                switch ( max ) {


                    case r: hue = ( g - b ) / delta + ( g < b ? 6 : 0 ); break;

                    case g: hue = ( b - r ) / delta + 2; break;

                    case b: hue = ( r - g ) / delta + 4; break;


                }


                hue /= 6;


            }


            target.h = hue;

            target.s = saturation;

            target.l = lightness;


            return target;


        }


        getRGB( target, colorSpace = ColorManagement.workingColorSpace ) {


            ColorManagement.fromWorkingColorSpace( _color.copy( this ), colorSpace );


            target.r = _color.r;

            target.g = _color.g;

            target.b = _color.b;


            return target;


        }


        getStyle( colorSpace = SRGBColorSpace ) {


            ColorManagement.fromWorkingColorSpace( _color.copy( this ), colorSpace );


            const r = _color.r, g = _color.g, b = _color.b;


            if ( colorSpace !== SRGBColorSpace ) {


                // Requires CSS Color Module Level 4 (https://www.w3.org/TR/css-color-4/).

                return `color(${ colorSpace } ${ r.toFixed( 3 ) } ${ g.toFixed( 3 ) } ${ b.toFixed( 3 ) })`;


            }


            return `rgb(${ Math.round( r * 255 ) },${ Math.round( g * 255 ) },${ Math.round( b * 255 ) })`;


        }


        offsetHSL( h, s, l ) {


            this.getHSL( _hslA );


            return this.setHSL( _hslA.h + h, _hslA.s + s, _hslA.l + l );


        }


        add( color ) {


            this.r += color.r;

            this.g += color.g;

            this.b += color.b;


            return this;


        }


        addColors( color1, color2 ) {


            this.r = color1.r + color2.r;

            this.g = color1.g + color2.g;

            this.b = color1.b + color2.b;


            return this;


        }


        addScalar( s ) {


            this.r += s;

            this.g += s;

            this.b += s;


            return this;


        }


        sub( color ) {


            this.r = Math.max( 0, this.r - color.r );

            this.g = Math.max( 0, this.g - color.g );

            this.b = Math.max( 0, this.b - color.b );


            return this;


        }


        multiply( color ) {


            this.r *= color.r;

            this.g *= color.g;

            this.b *= color.b;


            return this;


        }


        multiplyScalar( s ) {


            this.r *= s;

            this.g *= s;

            this.b *= s;


            return this;


        }


        lerp( color, alpha ) {


            this.r += ( color.r - this.r ) * alpha;

            this.g += ( color.g - this.g ) * alpha;

            this.b += ( color.b - this.b ) * alpha;


            return this;


        }


        lerpColors( color1, color2, alpha ) {


            this.r = color1.r + ( color2.r - color1.r ) * alpha;

            this.g = color1.g + ( color2.g - color1.g ) * alpha;

            this.b = color1.b + ( color2.b - color1.b ) * alpha;


            return this;


        }


        lerpHSL( color, alpha ) {


            this.getHSL( _hslA );

            color.getHSL( _hslB );


            const h = lerp( _hslA.h, _hslB.h, alpha );

            const s = lerp( _hslA.s, _hslB.s, alpha );

            const l = lerp( _hslA.l, _hslB.l, alpha );


            this.setHSL( h, s, l );


            return this;


        }


        setFromVector3( v ) {


            this.r = v.x;

            this.g = v.y;

            this.b = v.z;


            return this;


        }


        applyMatrix3( m ) {


            const r = this.r, g = this.g, b = this.b;

            const e = m.elements;


            this.r = e[ 0 ] * r + e[ 3 ] * g + e[ 6 ] * b;

            this.g = e[ 1 ] * r + e[ 4 ] * g + e[ 7 ] * b;

            this.b = e[ 2 ] * r + e[ 5 ] * g + e[ 8 ] * b;


            return this;


        }


        equals( c ) {


            return ( c.r === this.r ) && ( c.g === this.g ) && ( c.b === this.b );


        }


        fromArray( array, offset = 0 ) {


            this.r = array[ offset ];

            this.g = array[ offset + 1 ];

            this.b = array[ offset + 2 ];


            return this;


        }


        toArray( array = [], offset = 0 ) {


            array[ offset ] = this.r;

            array[ offset + 1 ] = this.g;

            array[ offset + 2 ] = this.b;


            return array;


        }


        fromBufferAttribute( attribute, index ) {


            this.r = attribute.getX( index );

            this.g = attribute.getY( index );

            this.b = attribute.getZ( index );


            return this;


        }


        toJSON() {


            return this.getHex();


        }


        *[ Symbol.iterator ]() {


            yield this.r;

            yield this.g;

            yield this.b;


        }


    }


    const _color = /*@__PURE__*/ new Color();


    Color.NAMES = _colorKeywords;


    let _materialId = 0;


    class Material extends EventDispatcher {


        constructor() {


            super();


            this.isMaterial = true;


            Object.defineProperty( this, 'id', { value: _materialId ++ } );


            this.uuid = generateUUID();


            this.name = '';

            this.type = 'Material';


            this.blending = NormalBlending;

            this.side = FrontSide;

            this.vertexColors = false;


            this.opacity = 1;

            this.transparent = false;

            this.alphaHash = false;


            this.blendSrc = SrcAlphaFactor;

            this.blendDst = OneMinusSrcAlphaFactor;

            this.blendEquation = AddEquation;

            this.blendSrcAlpha = null;

            this.blendDstAlpha = null;

            this.blendEquationAlpha = null;

            this.blendColor = new Color( 0, 0, 0 );

            this.blendAlpha = 0;


            this.depthFunc = LessEqualDepth;

            this.depthTest = true;

            this.depthWrite = true;


            this.stencilWriteMask = 0xff;

            this.stencilFunc = AlwaysStencilFunc;

            this.stencilRef = 0;

            this.stencilFuncMask = 0xff;

            this.stencilFail = KeepStencilOp;

            this.stencilZFail = KeepStencilOp;

            this.stencilZPass = KeepStencilOp;

            this.stencilWrite = false;


            this.clippingPlanes = null;

            this.clipIntersection = false;

            this.clipShadows = false;


            this.shadowSide = null;


            this.colorWrite = true;


            this.precision = null; // override the renderer's default precision for this material


            this.polygonOffset = false;

            this.polygonOffsetFactor = 0;

            this.polygonOffsetUnits = 0;


            this.dithering = false;


            this.alphaToCoverage = false;

            this.premultipliedAlpha = false;

            this.forceSinglePass = false;


            this.visible = true;


            this.toneMapped = true;


            this.userData = {};


            this.version = 0;


            this._alphaTest = 0;


        }


        get alphaTest() {


            return this._alphaTest;


        }


        set alphaTest( value ) {


            if ( this._alphaTest > 0 !== value > 0 ) {


                this.version ++;


            }


            this._alphaTest = value;


        }


        onBuild( /* shaderobject, renderer */ ) {}


        onBeforeRender( /* renderer, scene, camera, geometry, object, group */ ) {}


        onBeforeCompile( /* shaderobject, renderer */ ) {}


        customProgramCacheKey() {


            return this.onBeforeCompile.toString();


        }


        setValues( values ) {


            if ( values === undefined ) return;


            for ( const key in values ) {


                const newValue = values[ key ];


                if ( newValue === undefined ) {


                    console.warn( `THREE.Material: parameter '${ key }' has value of undefined.` );

                    continue;


                }


                const currentValue = this[ key ];


                if ( currentValue === undefined ) {


                    console.warn( `THREE.Material: '${ key }' is not a property of THREE.${ this.type }.` );

                    continue;


                }


                if ( currentValue && currentValue.isColor ) {


                    currentValue.set( newValue );


                } else if ( ( currentValue && currentValue.isVector3 ) && ( newValue && newValue.isVector3 ) ) {


                    currentValue.copy( newValue );


                } else {


                    this[ key ] = newValue;


                }


            }


        }


        toJSON( meta ) {


            const isRootObject = ( meta === undefined || typeof meta === 'string' );


            if ( isRootObject ) {


                meta = {

                    textures: {},

                    images: {}

                };


            }


            const data = {

                metadata: {

                    version: 4.6,

                    type: 'Material',

                    generator: 'Material.toJSON'

                }

            };


            // standard Material serialization

            data.uuid = this.uuid;

            data.type = this.type;


            if ( this.name !== '' ) data.name = this.name;


            if ( this.color && this.color.isColor ) data.color = this.color.getHex();


            if ( this.roughness !== undefined ) data.roughness = this.roughness;

            if ( this.metalness !== undefined ) data.metalness = this.metalness;


            if ( this.sheen !== undefined ) data.sheen = this.sheen;

            if ( this.sheenColor && this.sheenColor.isColor ) data.sheenColor = this.sheenColor.getHex();

            if ( this.sheenRoughness !== undefined ) data.sheenRoughness = this.sheenRoughness;

            if ( this.emissive && this.emissive.isColor ) data.emissive = this.emissive.getHex();

            if ( this.emissiveIntensity && this.emissiveIntensity !== 1 ) data.emissiveIntensity = this.emissiveIntensity;


            if ( this.specular && this.specular.isColor ) data.specular = this.specular.getHex();

            if ( this.specularIntensity !== undefined ) data.specularIntensity = this.specularIntensity;

            if ( this.specularColor && this.specularColor.isColor ) data.specularColor = this.specularColor.getHex();

            if ( this.shininess !== undefined ) data.shininess = this.shininess;

            if ( this.clearcoat !== undefined ) data.clearcoat = this.clearcoat;

            if ( this.clearcoatRoughness !== undefined ) data.clearcoatRoughness = this.clearcoatRoughness;


            if ( this.clearcoatMap && this.clearcoatMap.isTexture ) {


                data.clearcoatMap = this.clearcoatMap.toJSON( meta ).uuid;


            }


            if ( this.clearcoatRoughnessMap && this.clearcoatRoughnessMap.isTexture ) {


                data.clearcoatRoughnessMap = this.clearcoatRoughnessMap.toJSON( meta ).uuid;


            }


            if ( this.clearcoatNormalMap && this.clearcoatNormalMap.isTexture ) {


                data.clearcoatNormalMap = this.clearcoatNormalMap.toJSON( meta ).uuid;

                data.clearcoatNormalScale = this.clearcoatNormalScale.toArray();


            }


            if ( this.iridescence !== undefined ) data.iridescence = this.iridescence;

            if ( this.iridescenceIOR !== undefined ) data.iridescenceIOR = this.iridescenceIOR;

            if ( this.iridescenceThicknessRange !== undefined ) data.iridescenceThicknessRange = this.iridescenceThicknessRange;


            if ( this.iridescenceMap && this.iridescenceMap.isTexture ) {


                data.iridescenceMap = this.iridescenceMap.toJSON( meta ).uuid;


            }


            if ( this.iridescenceThicknessMap && this.iridescenceThicknessMap.isTexture ) {


                data.iridescenceThicknessMap = this.iridescenceThicknessMap.toJSON( meta ).uuid;


            }


            if ( this.anisotropy !== undefined ) data.anisotropy = this.anisotropy;

            if ( this.anisotropyRotation !== undefined ) data.anisotropyRotation = this.anisotropyRotation;


            if ( this.anisotropyMap && this.anisotropyMap.isTexture ) {


                data.anisotropyMap = this.anisotropyMap.toJSON( meta ).uuid;


            }


            if ( this.map && this.map.isTexture ) data.map = this.map.toJSON( meta ).uuid;

            if ( this.matcap && this.matcap.isTexture ) data.matcap = this.matcap.toJSON( meta ).uuid;

            if ( this.alphaMap && this.alphaMap.isTexture ) data.alphaMap = this.alphaMap.toJSON( meta ).uuid;


            if ( this.lightMap && this.lightMap.isTexture ) {


                data.lightMap = this.lightMap.toJSON( meta ).uuid;

                data.lightMapIntensity = this.lightMapIntensity;


            }


            if ( this.aoMap && this.aoMap.isTexture ) {


                data.aoMap = this.aoMap.toJSON( meta ).uuid;

                data.aoMapIntensity = this.aoMapIntensity;


            }


            if ( this.bumpMap && this.bumpMap.isTexture ) {


                data.bumpMap = this.bumpMap.toJSON( meta ).uuid;

                data.bumpScale = this.bumpScale;


            }


            if ( this.normalMap && this.normalMap.isTexture ) {


                data.normalMap = this.normalMap.toJSON( meta ).uuid;

                data.normalMapType = this.normalMapType;

                data.normalScale = this.normalScale.toArray();


            }


            if ( this.displacementMap && this.displacementMap.isTexture ) {


                data.displacementMap = this.displacementMap.toJSON( meta ).uuid;

                data.displacementScale = this.displacementScale;

                data.displacementBias = this.displacementBias;


            }


            if ( this.roughnessMap && this.roughnessMap.isTexture ) data.roughnessMap = this.roughnessMap.toJSON( meta ).uuid;

            if ( this.metalnessMap && this.metalnessMap.isTexture ) data.metalnessMap = this.metalnessMap.toJSON( meta ).uuid;


            if ( this.emissiveMap && this.emissiveMap.isTexture ) data.emissiveMap = this.emissiveMap.toJSON( meta ).uuid;

            if ( this.specularMap && this.specularMap.isTexture ) data.specularMap = this.specularMap.toJSON( meta ).uuid;

            if ( this.specularIntensityMap && this.specularIntensityMap.isTexture ) data.specularIntensityMap = this.specularIntensityMap.toJSON( meta ).uuid;

            if ( this.specularColorMap && this.specularColorMap.isTexture ) data.specularColorMap = this.specularColorMap.toJSON( meta ).uuid;


            if ( this.envMap && this.envMap.isTexture ) {


                data.envMap = this.envMap.toJSON( meta ).uuid;


                if ( this.combine !== undefined ) data.combine = this.combine;


            }


            if ( this.envMapIntensity !== undefined ) data.envMapIntensity = this.envMapIntensity;

            if ( this.reflectivity !== undefined ) data.reflectivity = this.reflectivity;

            if ( this.refractionRatio !== undefined ) data.refractionRatio = this.refractionRatio;


            if ( this.gradientMap && this.gradientMap.isTexture ) {


                data.gradientMap = this.gradientMap.toJSON( meta ).uuid;


            }


            if ( this.transmission !== undefined ) data.transmission = this.transmission;

            if ( this.transmissionMap && this.transmissionMap.isTexture ) data.transmissionMap = this.transmissionMap.toJSON( meta ).uuid;

            if ( this.thickness !== undefined ) data.thickness = this.thickness;

            if ( this.thicknessMap && this.thicknessMap.isTexture ) data.thicknessMap = this.thicknessMap.toJSON( meta ).uuid;

            if ( this.attenuationDistance !== undefined && this.attenuationDistance !== Infinity ) data.attenuationDistance = this.attenuationDistance;

            if ( this.attenuationColor !== undefined ) data.attenuationColor = this.attenuationColor.getHex();


            if ( this.size !== undefined ) data.size = this.size;

            if ( this.shadowSide !== null ) data.shadowSide = this.shadowSide;

            if ( this.sizeAttenuation !== undefined ) data.sizeAttenuation = this.sizeAttenuation;


            if ( this.blending !== NormalBlending ) data.blending = this.blending;

            if ( this.side !== FrontSide ) data.side = this.side;

            if ( this.vertexColors === true ) data.vertexColors = true;


            if ( this.opacity < 1 ) data.opacity = this.opacity;

            if ( this.transparent === true ) data.transparent = true;


            if ( this.blendSrc !== SrcAlphaFactor ) data.blendSrc = this.blendSrc;

            if ( this.blendDst !== OneMinusSrcAlphaFactor ) data.blendDst = this.blendDst;

            if ( this.blendEquation !== AddEquation ) data.blendEquation = this.blendEquation;

            if ( this.blendSrcAlpha !== null ) data.blendSrcAlpha = this.blendSrcAlpha;

            if ( this.blendDstAlpha !== null ) data.blendDstAlpha = this.blendDstAlpha;

            if ( this.blendEquationAlpha !== null ) data.blendEquationAlpha = this.blendEquationAlpha;

            if ( this.blendColor && this.blendColor.isColor ) data.blendColor = this.blendColor.getHex();

            if ( this.blendAlpha !== 0 ) data.blendAlpha = this.blendAlpha;


            if ( this.depthFunc !== LessEqualDepth ) data.depthFunc = this.depthFunc;

            if ( this.depthTest === false ) data.depthTest = this.depthTest;

            if ( this.depthWrite === false ) data.depthWrite = this.depthWrite;

            if ( this.colorWrite === false ) data.colorWrite = this.colorWrite;


            if ( this.stencilWriteMask !== 0xff ) data.stencilWriteMask = this.stencilWriteMask;

            if ( this.stencilFunc !== AlwaysStencilFunc ) data.stencilFunc = this.stencilFunc;

            if ( this.stencilRef !== 0 ) data.stencilRef = this.stencilRef;

            if ( this.stencilFuncMask !== 0xff ) data.stencilFuncMask = this.stencilFuncMask;

            if ( this.stencilFail !== KeepStencilOp ) data.stencilFail = this.stencilFail;

            if ( this.stencilZFail !== KeepStencilOp ) data.stencilZFail = this.stencilZFail;

            if ( this.stencilZPass !== KeepStencilOp ) data.stencilZPass = this.stencilZPass;

            if ( this.stencilWrite === true ) data.stencilWrite = this.stencilWrite;


            // rotation (SpriteMaterial)

            if ( this.rotation !== undefined && this.rotation !== 0 ) data.rotation = this.rotation;


            if ( this.polygonOffset === true ) data.polygonOffset = true;

            if ( this.polygonOffsetFactor !== 0 ) data.polygonOffsetFactor = this.polygonOffsetFactor;

            if ( this.polygonOffsetUnits !== 0 ) data.polygonOffsetUnits = this.polygonOffsetUnits;


            if ( this.linewidth !== undefined && this.linewidth !== 1 ) data.linewidth = this.linewidth;

            if ( this.dashSize !== undefined ) data.dashSize = this.dashSize;

            if ( this.gapSize !== undefined ) data.gapSize = this.gapSize;

            if ( this.scale !== undefined ) data.scale = this.scale;


            if ( this.dithering === true ) data.dithering = true;


            if ( this.alphaTest > 0 ) data.alphaTest = this.alphaTest;

            if ( this.alphaHash === true ) data.alphaHash = true;

            if ( this.alphaToCoverage === true ) data.alphaToCoverage = true;

            if ( this.premultipliedAlpha === true ) data.premultipliedAlpha = true;

            if ( this.forceSinglePass === true ) data.forceSinglePass = true;


            if ( this.wireframe === true ) data.wireframe = true;

            if ( this.wireframeLinewidth > 1 ) data.wireframeLinewidth = this.wireframeLinewidth;

            if ( this.wireframeLinecap !== 'round' ) data.wireframeLinecap = this.wireframeLinecap;

            if ( this.wireframeLinejoin !== 'round' ) data.wireframeLinejoin = this.wireframeLinejoin;


            if ( this.flatShading === true ) data.flatShading = true;


            if ( this.visible === false ) data.visible = false;


            if ( this.toneMapped === false ) data.toneMapped = false;


            if ( this.fog === false ) data.fog = false;


            if ( Object.keys( this.userData ).length > 0 ) data.userData = this.userData;


            // TODO: Copied from Object3D.toJSON


            function extractFromCache( cache ) {


                const values = [];


                for ( const key in cache ) {


                    const data = cache[ key ];

                    delete data.metadata;

                    values.push( data );


                }


                return values;


            }


            if ( isRootObject ) {


                const textures = extractFromCache( meta.textures );

                const images = extractFromCache( meta.images );


                if ( textures.length > 0 ) data.textures = textures;

                if ( images.length > 0 ) data.images = images;


            }


            return data;


        }


        clone() {


            return new this.constructor().copy( this );


        }


        copy( source ) {


            this.name = source.name;


            this.blending = source.blending;

            this.side = source.side;

            this.vertexColors = source.vertexColors;


            this.opacity = source.opacity;

            this.transparent = source.transparent;


            this.blendSrc = source.blendSrc;

            this.blendDst = source.blendDst;

            this.blendEquation = source.blendEquation;

            this.blendSrcAlpha = source.blendSrcAlpha;

            this.blendDstAlpha = source.blendDstAlpha;

            this.blendEquationAlpha = source.blendEquationAlpha;

            this.blendColor.copy( source.blendColor );

            this.blendAlpha = source.blendAlpha;


            this.depthFunc = source.depthFunc;

            this.depthTest = source.depthTest;

            this.depthWrite = source.depthWrite;


            this.stencilWriteMask = source.stencilWriteMask;

            this.stencilFunc = source.stencilFunc;

            this.stencilRef = source.stencilRef;

            this.stencilFuncMask = source.stencilFuncMask;

            this.stencilFail = source.stencilFail;

            this.stencilZFail = source.stencilZFail;

            this.stencilZPass = source.stencilZPass;

            this.stencilWrite = source.stencilWrite;


            const srcPlanes = source.clippingPlanes;

            let dstPlanes = null;


            if ( srcPlanes !== null ) {


                const n = srcPlanes.length;

                dstPlanes = new Array( n );


                for ( let i = 0; i !== n; ++ i ) {


                    dstPlanes[ i ] = srcPlanes[ i ].clone();


                }


            }


            this.clippingPlanes = dstPlanes;

            this.clipIntersection = source.clipIntersection;

            this.clipShadows = source.clipShadows;


            this.shadowSide = source.shadowSide;


            this.colorWrite = source.colorWrite;


            this.precision = source.precision;


            this.polygonOffset = source.polygonOffset;

            this.polygonOffsetFactor = source.polygonOffsetFactor;

            this.polygonOffsetUnits = source.polygonOffsetUnits;


            this.dithering = source.dithering;


            this.alphaTest = source.alphaTest;

            this.alphaHash = source.alphaHash;

            this.alphaToCoverage = source.alphaToCoverage;

            this.premultipliedAlpha = source.premultipliedAlpha;

            this.forceSinglePass = source.forceSinglePass;


            this.visible = source.visible;


            this.toneMapped = source.toneMapped;


            this.userData = JSON.parse( JSON.stringify( source.userData ) );


            return this;


        }


        dispose() {


            this.dispatchEvent( { type: 'dispose' } );


        }


        set needsUpdate( value ) {


            if ( value === true ) this.version ++;


        }


    }


    class MeshBasicMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isMeshBasicMaterial = true;


            this.type = 'MeshBasicMaterial';


            this.color = new Color( 0xffffff ); // emissive


            this.map = null;


            this.lightMap = null;

            this.lightMapIntensity = 1.0;


            this.aoMap = null;

            this.aoMapIntensity = 1.0;


            this.specularMap = null;


            this.alphaMap = null;


            this.envMap = null;

            this.combine = MultiplyOperation;

            this.reflectivity = 1;

            this.refractionRatio = 0.98;


            this.wireframe = false;

            this.wireframeLinewidth = 1;

            this.wireframeLinecap = 'round';

            this.wireframeLinejoin = 'round';


            this.fog = true;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.color.copy( source.color );


            this.map = source.map;


            this.lightMap = source.lightMap;

            this.lightMapIntensity = source.lightMapIntensity;


            this.aoMap = source.aoMap;

            this.aoMapIntensity = source.aoMapIntensity;


            this.specularMap = source.specularMap;


            this.alphaMap = source.alphaMap;


            this.envMap = source.envMap;

            this.combine = source.combine;

            this.reflectivity = source.reflectivity;

            this.refractionRatio = source.refractionRatio;


            this.wireframe = source.wireframe;

            this.wireframeLinewidth = source.wireframeLinewidth;

            this.wireframeLinecap = source.wireframeLinecap;

            this.wireframeLinejoin = source.wireframeLinejoin;


            this.fog = source.fog;


            return this;


        }


    }


    // Fast Half Float Conversions, http://www.fox-toolkit.org/ftp/fasthalffloatconversion.pdf


    const _tables = /*@__PURE__*/ _generateTables();


    function _generateTables() {


        // float32 to float16 helpers


        const buffer = new ArrayBuffer( 4 );

        const floatView = new Float32Array( buffer );

        const uint32View = new Uint32Array( buffer );


        const baseTable = new Uint32Array( 512 );

        const shiftTable = new Uint32Array( 512 );


        for ( let i = 0; i < 256; ++ i ) {


            const e = i - 127;


            // very small number (0, -0)


            if ( e < - 27 ) {


                baseTable[ i ] = 0x0000;

                baseTable[ i | 0x100 ] = 0x8000;

                shiftTable[ i ] = 24;

                shiftTable[ i | 0x100 ] = 24;


                // small number (denorm)


            } else if ( e < - 14 ) {


                baseTable[ i ] = 0x0400 >> ( - e - 14 );

                baseTable[ i | 0x100 ] = ( 0x0400 >> ( - e - 14 ) ) | 0x8000;

                shiftTable[ i ] = - e - 1;

                shiftTable[ i | 0x100 ] = - e - 1;


                // normal number


            } else if ( e <= 15 ) {


                baseTable[ i ] = ( e + 15 ) << 10;

                baseTable[ i | 0x100 ] = ( ( e + 15 ) << 10 ) | 0x8000;

                shiftTable[ i ] = 13;

                shiftTable[ i | 0x100 ] = 13;


                // large number (Infinity, -Infinity)


            } else if ( e < 128 ) {


                baseTable[ i ] = 0x7c00;

                baseTable[ i | 0x100 ] = 0xfc00;

                shiftTable[ i ] = 24;

                shiftTable[ i | 0x100 ] = 24;


                // stay (NaN, Infinity, -Infinity)


            } else {


                baseTable[ i ] = 0x7c00;

                baseTable[ i | 0x100 ] = 0xfc00;

                shiftTable[ i ] = 13;

                shiftTable[ i | 0x100 ] = 13;


            }


        }


        // float16 to float32 helpers


        const mantissaTable = new Uint32Array( 2048 );

        const exponentTable = new Uint32Array( 64 );

        const offsetTable = new Uint32Array( 64 );


        for ( let i = 1; i < 1024; ++ i ) {


            let m = i << 13; // zero pad mantissa bits

            let e = 0; // zero exponent


            // normalized

            while ( ( m & 0x00800000 ) === 0 ) {


                m <<= 1;

                e -= 0x00800000; // decrement exponent


            }


            m &= ~ 0x00800000; // clear leading 1 bit

            e += 0x38800000; // adjust bias


            mantissaTable[ i ] = m | e;


        }


        for ( let i = 1024; i < 2048; ++ i ) {


            mantissaTable[ i ] = 0x38000000 + ( ( i - 1024 ) << 13 );


        }


        for ( let i = 1; i < 31; ++ i ) {


            exponentTable[ i ] = i << 23;


        }


        exponentTable[ 31 ] = 0x47800000;

        exponentTable[ 32 ] = 0x80000000;


        for ( let i = 33; i < 63; ++ i ) {


            exponentTable[ i ] = 0x80000000 + ( ( i - 32 ) << 23 );


        }


        exponentTable[ 63 ] = 0xc7800000;


        for ( let i = 1; i < 64; ++ i ) {


            if ( i !== 32 ) {


                offsetTable[ i ] = 1024;


            }


        }


        return {

            floatView: floatView,

            uint32View: uint32View,

            baseTable: baseTable,

            shiftTable: shiftTable,

            mantissaTable: mantissaTable,

            exponentTable: exponentTable,

            offsetTable: offsetTable

        };


    }


    // float32 to float16


    function toHalfFloat( val ) {


        if ( Math.abs( val ) > 65504 ) console.warn( 'THREE.DataUtils.toHalfFloat(): Value out of range.' );


        val = clamp( val, - 65504, 65504 );


        _tables.floatView[ 0 ] = val;

        const f = _tables.uint32View[ 0 ];

        const e = ( f >> 23 ) & 0x1ff;

        return _tables.baseTable[ e ] + ( ( f & 0x007fffff ) >> _tables.shiftTable[ e ] );


    }


    // float16 to float32


    function fromHalfFloat( val ) {


        const m = val >> 10;

        _tables.uint32View[ 0 ] = _tables.mantissaTable[ _tables.offsetTable[ m ] + ( val & 0x3ff ) ] + _tables.exponentTable[ m ];

        return _tables.floatView[ 0 ];


    }


    const DataUtils = {

        toHalfFloat: toHalfFloat,

        fromHalfFloat: fromHalfFloat,

    };


    const _vector$9 = /*@__PURE__*/ new Vector3();

    const _vector2$1 = /*@__PURE__*/ new Vector2();


    class BufferAttribute {


        constructor( array, itemSize, normalized = false ) {


            if ( Array.isArray( array ) ) {


                throw new TypeError( 'THREE.BufferAttribute: array should be a Typed Array.' );


            }


            this.isBufferAttribute = true;


            this.name = '';


            this.array = array;

            this.itemSize = itemSize;

            this.count = array !== undefined ? array.length / itemSize : 0;

            this.normalized = normalized;


            this.usage = StaticDrawUsage;

            this._updateRange = { offset: 0, count: - 1 };

            this.updateRanges = [];

            this.gpuType = FloatType;


            this.version = 0;


        }


        onUploadCallback() {}


        set needsUpdate( value ) {


            if ( value === true ) this.version ++;


        }


        get updateRange() {


            console.warn( 'THREE.BufferAttribute: updateRange() is deprecated and will be removed in r169. Use addUpdateRange() instead.' ); // @deprecated, r159

            return this._updateRange;


        }


        setUsage( value ) {


            this.usage = value;


            return this;


        }


        addUpdateRange( start, count ) {


            this.updateRanges.push( { start, count } );


        }


        clearUpdateRanges() {


            this.updateRanges.length = 0;


        }


        copy( source ) {


            this.name = source.name;

            this.array = new source.array.constructor( source.array );

            this.itemSize = source.itemSize;

            this.count = source.count;

            this.normalized = source.normalized;


            this.usage = source.usage;

            this.gpuType = source.gpuType;


            return this;


        }


        copyAt( index1, attribute, index2 ) {


            index1 *= this.itemSize;

            index2 *= attribute.itemSize;


            for ( let i = 0, l = this.itemSize; i < l; i ++ ) {


                this.array[ index1 + i ] = attribute.array[ index2 + i ];


            }


            return this;


        }


        copyArray( array ) {


            this.array.set( array );


            return this;


        }


        applyMatrix3( m ) {


            if ( this.itemSize === 2 ) {


                for ( let i = 0, l = this.count; i < l; i ++ ) {


                    _vector2$1.fromBufferAttribute( this, i );

                    _vector2$1.applyMatrix3( m );


                    this.setXY( i, _vector2$1.x, _vector2$1.y );


                }


            } else if ( this.itemSize === 3 ) {


                for ( let i = 0, l = this.count; i < l; i ++ ) {


                    _vector$9.fromBufferAttribute( this, i );

                    _vector$9.applyMatrix3( m );


                    this.setXYZ( i, _vector$9.x, _vector$9.y, _vector$9.z );


                }


            }


            return this;


        }


        applyMatrix4( m ) {


            for ( let i = 0, l = this.count; i < l; i ++ ) {


                _vector$9.fromBufferAttribute( this, i );


                _vector$9.applyMatrix4( m );


                this.setXYZ( i, _vector$9.x, _vector$9.y, _vector$9.z );


            }


            return this;


        }


        applyNormalMatrix( m ) {


            for ( let i = 0, l = this.count; i < l; i ++ ) {


                _vector$9.fromBufferAttribute( this, i );


                _vector$9.applyNormalMatrix( m );


                this.setXYZ( i, _vector$9.x, _vector$9.y, _vector$9.z );


            }


            return this;


        }


        transformDirection( m ) {


            for ( let i = 0, l = this.count; i < l; i ++ ) {


                _vector$9.fromBufferAttribute( this, i );


                _vector$9.transformDirection( m );


                this.setXYZ( i, _vector$9.x, _vector$9.y, _vector$9.z );


            }


            return this;


        }


        set( value, offset = 0 ) {


            // Matching BufferAttribute constructor, do not normalize the array.

            this.array.set( value, offset );


            return this;


        }


        getComponent( index, component ) {


            let value = this.array[ index * this.itemSize + component ];


            if ( this.normalized ) value = denormalize( value, this.array );


            return value;


        }


        setComponent( index, component, value ) {


            if ( this.normalized ) value = normalize( value, this.array );


            this.array[ index * this.itemSize + component ] = value;


            return this;


        }


        getX( index ) {


            let x = this.array[ index * this.itemSize ];


            if ( this.normalized ) x = denormalize( x, this.array );


            return x;


        }


        setX( index, x ) {


            if ( this.normalized ) x = normalize( x, this.array );


            this.array[ index * this.itemSize ] = x;


            return this;


        }


        getY( index ) {


            let y = this.array[ index * this.itemSize + 1 ];


            if ( this.normalized ) y = denormalize( y, this.array );


            return y;


        }


        setY( index, y ) {


            if ( this.normalized ) y = normalize( y, this.array );


            this.array[ index * this.itemSize + 1 ] = y;


            return this;


        }


        getZ( index ) {


            let z = this.array[ index * this.itemSize + 2 ];


            if ( this.normalized ) z = denormalize( z, this.array );


            return z;


        }


        setZ( index, z ) {


            if ( this.normalized ) z = normalize( z, this.array );


            this.array[ index * this.itemSize + 2 ] = z;


            return this;


        }


        getW( index ) {


            let w = this.array[ index * this.itemSize + 3 ];


            if ( this.normalized ) w = denormalize( w, this.array );


            return w;


        }


        setW( index, w ) {


            if ( this.normalized ) w = normalize( w, this.array );


            this.array[ index * this.itemSize + 3 ] = w;


            return this;


        }


        setXY( index, x, y ) {


            index *= this.itemSize;


            if ( this.normalized ) {


                x = normalize( x, this.array );

                y = normalize( y, this.array );


            }


            this.array[ index + 0 ] = x;

            this.array[ index + 1 ] = y;


            return this;


        }


        setXYZ( index, x, y, z ) {


            index *= this.itemSize;


            if ( this.normalized ) {


                x = normalize( x, this.array );

                y = normalize( y, this.array );

                z = normalize( z, this.array );


            }


            this.array[ index + 0 ] = x;

            this.array[ index + 1 ] = y;

            this.array[ index + 2 ] = z;


            return this;


        }


        setXYZW( index, x, y, z, w ) {


            index *= this.itemSize;


            if ( this.normalized ) {


                x = normalize( x, this.array );

                y = normalize( y, this.array );

                z = normalize( z, this.array );

                w = normalize( w, this.array );


            }


            this.array[ index + 0 ] = x;

            this.array[ index + 1 ] = y;

            this.array[ index + 2 ] = z;

            this.array[ index + 3 ] = w;


            return this;


        }


        onUpload( callback ) {


            this.onUploadCallback = callback;


            return this;


        }


        clone() {


            return new this.constructor( this.array, this.itemSize ).copy( this );


        }


        toJSON() {


            const data = {

                itemSize: this.itemSize,

                type: this.array.constructor.name,

                array: Array.from( this.array ),

                normalized: this.normalized

            };


            if ( this.name !== '' ) data.name = this.name;

            if ( this.usage !== StaticDrawUsage ) data.usage = this.usage;


            return data;


        }


    }


    //


    class Int8BufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized ) {


            super( new Int8Array( array ), itemSize, normalized );


        }


    }


    class Uint8BufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized ) {


            super( new Uint8Array( array ), itemSize, normalized );


        }


    }


    class Uint8ClampedBufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized ) {


            super( new Uint8ClampedArray( array ), itemSize, normalized );


        }


    }


    class Int16BufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized ) {


            super( new Int16Array( array ), itemSize, normalized );


        }


    }


    class Uint16BufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized ) {


            super( new Uint16Array( array ), itemSize, normalized );


        }


    }


    class Int32BufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized ) {


            super( new Int32Array( array ), itemSize, normalized );


        }


    }


    class Uint32BufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized ) {


            super( new Uint32Array( array ), itemSize, normalized );


        }


    }


    class Float16BufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized ) {


            super( new Uint16Array( array ), itemSize, normalized );


            this.isFloat16BufferAttribute = true;


        }


        getX( index ) {


            let x = fromHalfFloat( this.array[ index * this.itemSize ] );


            if ( this.normalized ) x = denormalize( x, this.array );


            return x;


        }


        setX( index, x ) {


            if ( this.normalized ) x = normalize( x, this.array );


            this.array[ index * this.itemSize ] = toHalfFloat( x );


            return this;


        }


        getY( index ) {


            let y = fromHalfFloat( this.array[ index * this.itemSize + 1 ] );


            if ( this.normalized ) y = denormalize( y, this.array );


            return y;


        }


        setY( index, y ) {


            if ( this.normalized ) y = normalize( y, this.array );


            this.array[ index * this.itemSize + 1 ] = toHalfFloat( y );


            return this;


        }


        getZ( index ) {


            let z = fromHalfFloat( this.array[ index * this.itemSize + 2 ] );


            if ( this.normalized ) z = denormalize( z, this.array );


            return z;


        }


        setZ( index, z ) {


            if ( this.normalized ) z = normalize( z, this.array );


            this.array[ index * this.itemSize + 2 ] = toHalfFloat( z );


            return this;


        }


        getW( index ) {


            let w = fromHalfFloat( this.array[ index * this.itemSize + 3 ] );


            if ( this.normalized ) w = denormalize( w, this.array );


            return w;


        }


        setW( index, w ) {


            if ( this.normalized ) w = normalize( w, this.array );


            this.array[ index * this.itemSize + 3 ] = toHalfFloat( w );


            return this;


        }


        setXY( index, x, y ) {


            index *= this.itemSize;


            if ( this.normalized ) {


                x = normalize( x, this.array );

                y = normalize( y, this.array );


            }


            this.array[ index + 0 ] = toHalfFloat( x );

            this.array[ index + 1 ] = toHalfFloat( y );


            return this;


        }


        setXYZ( index, x, y, z ) {


            index *= this.itemSize;


            if ( this.normalized ) {


                x = normalize( x, this.array );

                y = normalize( y, this.array );

                z = normalize( z, this.array );


            }


            this.array[ index + 0 ] = toHalfFloat( x );

            this.array[ index + 1 ] = toHalfFloat( y );

            this.array[ index + 2 ] = toHalfFloat( z );


            return this;


        }


        setXYZW( index, x, y, z, w ) {


            index *= this.itemSize;


            if ( this.normalized ) {


                x = normalize( x, this.array );

                y = normalize( y, this.array );

                z = normalize( z, this.array );

                w = normalize( w, this.array );


            }


            this.array[ index + 0 ] = toHalfFloat( x );

            this.array[ index + 1 ] = toHalfFloat( y );

            this.array[ index + 2 ] = toHalfFloat( z );

            this.array[ index + 3 ] = toHalfFloat( w );


            return this;


        }


    }


    class Float32BufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized ) {


            super( new Float32Array( array ), itemSize, normalized );


        }


    }


    class Float64BufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized ) {


            super( new Float64Array( array ), itemSize, normalized );


        }


    }


    let _id$2 = 0;


    const _m1 = /*@__PURE__*/ new Matrix4();

    const _obj = /*@__PURE__*/ new Object3D();

    const _offset = /*@__PURE__*/ new Vector3();

    const _box$2 = /*@__PURE__*/ new Box3();

    const _boxMorphTargets = /*@__PURE__*/ new Box3();

    const _vector$8 = /*@__PURE__*/ new Vector3();


    class BufferGeometry extends EventDispatcher {


        constructor() {


            super();


            this.isBufferGeometry = true;


            Object.defineProperty( this, 'id', { value: _id$2 ++ } );


            this.uuid = generateUUID();


            this.name = '';

            this.type = 'BufferGeometry';


            this.index = null;

            this.attributes = {};


            this.morphAttributes = {};

            this.morphTargetsRelative = false;


            this.groups = [];


            this.boundingBox = null;

            this.boundingSphere = null;


            this.drawRange = { start: 0, count: Infinity };


            this.userData = {};


        }


        getIndex() {


            return this.index;


        }


        setIndex( index ) {


            if ( Array.isArray( index ) ) {


                this.index = new ( arrayNeedsUint32( index ) ? Uint32BufferAttribute : Uint16BufferAttribute )( index, 1 );


            } else {


                this.index = index;


            }


            return this;


        }


        getAttribute( name ) {


            return this.attributes[ name ];


        }


        setAttribute( name, attribute ) {


            this.attributes[ name ] = attribute;


            return this;


        }


        deleteAttribute( name ) {


            delete this.attributes[ name ];


            return this;


        }


        hasAttribute( name ) {


            return this.attributes[ name ] !== undefined;


        }


        addGroup( start, count, materialIndex = 0 ) {


            this.groups.push( {


                start: start,

                count: count,

                materialIndex: materialIndex


            } );


        }


        clearGroups() {


            this.groups = [];


        }


        setDrawRange( start, count ) {


            this.drawRange.start = start;

            this.drawRange.count = count;


        }


        applyMatrix4( matrix ) {


            const position = this.attributes.position;


            if ( position !== undefined ) {


                position.applyMatrix4( matrix );


                position.needsUpdate = true;


            }


            const normal = this.attributes.normal;


            if ( normal !== undefined ) {


                const normalMatrix = new Matrix3().getNormalMatrix( matrix );


                normal.applyNormalMatrix( normalMatrix );


                normal.needsUpdate = true;


            }


            const tangent = this.attributes.tangent;


            if ( tangent !== undefined ) {


                tangent.transformDirection( matrix );


                tangent.needsUpdate = true;


            }


            if ( this.boundingBox !== null ) {


                this.computeBoundingBox();


            }


            if ( this.boundingSphere !== null ) {


                this.computeBoundingSphere();


            }


            return this;


        }


        applyQuaternion( q ) {


            _m1.makeRotationFromQuaternion( q );


            this.applyMatrix4( _m1 );


            return this;


        }


        rotateX( angle ) {


            // rotate geometry around world x-axis


            _m1.makeRotationX( angle );


            this.applyMatrix4( _m1 );


            return this;


        }


        rotateY( angle ) {


            // rotate geometry around world y-axis


            _m1.makeRotationY( angle );


            this.applyMatrix4( _m1 );


            return this;


        }


        rotateZ( angle ) {


            // rotate geometry around world z-axis


            _m1.makeRotationZ( angle );


            this.applyMatrix4( _m1 );


            return this;


        }


        translate( x, y, z ) {


            // translate geometry


            _m1.makeTranslation( x, y, z );


            this.applyMatrix4( _m1 );


            return this;


        }


        scale( x, y, z ) {


            // scale geometry


            _m1.makeScale( x, y, z );


            this.applyMatrix4( _m1 );


            return this;


        }


        lookAt( vector ) {


            _obj.lookAt( vector );


            _obj.updateMatrix();


            this.applyMatrix4( _obj.matrix );


            return this;


        }


        center() {


            this.computeBoundingBox();


            this.boundingBox.getCenter( _offset ).negate();


            this.translate( _offset.x, _offset.y, _offset.z );


            return this;


        }


        setFromPoints( points ) {


            const position = [];


            for ( let i = 0, l = points.length; i < l; i ++ ) {


                const point = points[ i ];

                position.push( point.x, point.y, point.z || 0 );


            }


            this.setAttribute( 'position', new Float32BufferAttribute( position, 3 ) );


            return this;


        }


        computeBoundingBox() {


            if ( this.boundingBox === null ) {


                this.boundingBox = new Box3();


            }


            const position = this.attributes.position;

            const morphAttributesPosition = this.morphAttributes.position;


            if ( position && position.isGLBufferAttribute ) {


                console.error( 'THREE.BufferGeometry.computeBoundingBox(): GLBufferAttribute requires a manual bounding box. Alternatively set "mesh.frustumCulled" to "false".', this );


                this.boundingBox.set(

                    new Vector3( - Infinity, - Infinity, - Infinity ),

                    new Vector3( + Infinity, + Infinity, + Infinity )

                );


                return;


            }


            if ( position !== undefined ) {


                this.boundingBox.setFromBufferAttribute( position );


                // process morph attributes if present


                if ( morphAttributesPosition ) {


                    for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {


                        const morphAttribute = morphAttributesPosition[ i ];

                        _box$2.setFromBufferAttribute( morphAttribute );


                        if ( this.morphTargetsRelative ) {


                            _vector$8.addVectors( this.boundingBox.min, _box$2.min );

                            this.boundingBox.expandByPoint( _vector$8 );


                            _vector$8.addVectors( this.boundingBox.max, _box$2.max );

                            this.boundingBox.expandByPoint( _vector$8 );


                        } else {


                            this.boundingBox.expandByPoint( _box$2.min );

                            this.boundingBox.expandByPoint( _box$2.max );


                        }


                    }


                }


            } else {


                this.boundingBox.makeEmpty();


            }


            if ( isNaN( this.boundingBox.min.x ) || isNaN( this.boundingBox.min.y ) || isNaN( this.boundingBox.min.z ) ) {


                console.error( 'THREE.BufferGeometry.computeBoundingBox(): Computed min/max have NaN values. The "position" attribute is likely to have NaN values.', this );


            }


        }


        computeBoundingSphere() {


            if ( this.boundingSphere === null ) {


                this.boundingSphere = new Sphere();


            }


            const position = this.attributes.position;

            const morphAttributesPosition = this.morphAttributes.position;


            if ( position && position.isGLBufferAttribute ) {


                console.error( 'THREE.BufferGeometry.computeBoundingSphere(): GLBufferAttribute requires a manual bounding sphere. Alternatively set "mesh.frustumCulled" to "false".', this );


                this.boundingSphere.set( new Vector3(), Infinity );


                return;


            }


            if ( position ) {


                // first, find the center of the bounding sphere


                const center = this.boundingSphere.center;


                _box$2.setFromBufferAttribute( position );


                // process morph attributes if present


                if ( morphAttributesPosition ) {


                    for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {


                        const morphAttribute = morphAttributesPosition[ i ];

                        _boxMorphTargets.setFromBufferAttribute( morphAttribute );


                        if ( this.morphTargetsRelative ) {


                            _vector$8.addVectors( _box$2.min, _boxMorphTargets.min );

                            _box$2.expandByPoint( _vector$8 );


                            _vector$8.addVectors( _box$2.max, _boxMorphTargets.max );

                            _box$2.expandByPoint( _vector$8 );


                        } else {


                            _box$2.expandByPoint( _boxMorphTargets.min );

                            _box$2.expandByPoint( _boxMorphTargets.max );


                        }


                    }


                }


                _box$2.getCenter( center );


                // second, try to find a boundingSphere with a radius smaller than the

                // boundingSphere of the boundingBox: sqrt(3) smaller in the best case


                let maxRadiusSq = 0;


                for ( let i = 0, il = position.count; i < il; i ++ ) {


                    _vector$8.fromBufferAttribute( position, i );


                    maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector$8 ) );


                }


                // process morph attributes if present


                if ( morphAttributesPosition ) {


                    for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {


                        const morphAttribute = morphAttributesPosition[ i ];

                        const morphTargetsRelative = this.morphTargetsRelative;


                        for ( let j = 0, jl = morphAttribute.count; j < jl; j ++ ) {


                            _vector$8.fromBufferAttribute( morphAttribute, j );


                            if ( morphTargetsRelative ) {


                                _offset.fromBufferAttribute( position, j );

                                _vector$8.add( _offset );


                            }


                            maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector$8 ) );


                        }


                    }


                }


                this.boundingSphere.radius = Math.sqrt( maxRadiusSq );


                if ( isNaN( this.boundingSphere.radius ) ) {


                    console.error( 'THREE.BufferGeometry.computeBoundingSphere(): Computed radius is NaN. The "position" attribute is likely to have NaN values.', this );


                }


            }


        }


        computeTangents() {


            const index = this.index;

            const attributes = this.attributes;


            // based on http://www.terathon.com/code/tangent.html

            // (per vertex tangents)


            if ( index === null ||

                 attributes.position === undefined ||

                 attributes.normal === undefined ||

                 attributes.uv === undefined ) {


                console.error( 'THREE.BufferGeometry: .computeTangents() failed. Missing required attributes (index, position, normal or uv)' );

                return;


            }


            const indices = index.array;

            const positions = attributes.position.array;

            const normals = attributes.normal.array;

            const uvs = attributes.uv.array;


            const nVertices = positions.length / 3;


            if ( this.hasAttribute( 'tangent' ) === false ) {


                this.setAttribute( 'tangent', new BufferAttribute( new Float32Array( 4 * nVertices ), 4 ) );


            }


            const tangents = this.getAttribute( 'tangent' ).array;


            const tan1 = [], tan2 = [];


            for ( let i = 0; i < nVertices; i ++ ) {


                tan1[ i ] = new Vector3();

                tan2[ i ] = new Vector3();


            }


            const vA = new Vector3(),

                vB = new Vector3(),

                vC = new Vector3(),


                uvA = new Vector2(),

                uvB = new Vector2(),

                uvC = new Vector2(),


                sdir = new Vector3(),

                tdir = new Vector3();


            function handleTriangle( a, b, c ) {


                vA.fromArray( positions, a * 3 );

                vB.fromArray( positions, b * 3 );

                vC.fromArray( positions, c * 3 );


                uvA.fromArray( uvs, a * 2 );

                uvB.fromArray( uvs, b * 2 );

                uvC.fromArray( uvs, c * 2 );


                vB.sub( vA );

                vC.sub( vA );


                uvB.sub( uvA );

                uvC.sub( uvA );


                const r = 1.0 / ( uvB.x * uvC.y - uvC.x * uvB.y );


                // silently ignore degenerate uv triangles having coincident or colinear vertices


                if ( ! isFinite( r ) ) return;


                sdir.copy( vB ).multiplyScalar( uvC.y ).addScaledVector( vC, - uvB.y ).multiplyScalar( r );

                tdir.copy( vC ).multiplyScalar( uvB.x ).addScaledVector( vB, - uvC.x ).multiplyScalar( r );


                tan1[ a ].add( sdir );

                tan1[ b ].add( sdir );

                tan1[ c ].add( sdir );


                tan2[ a ].add( tdir );

                tan2[ b ].add( tdir );

                tan2[ c ].add( tdir );


            }


            let groups = this.groups;


            if ( groups.length === 0 ) {


                groups = [ {

                    start: 0,

                    count: indices.length

                } ];


            }


            for ( let i = 0, il = groups.length; i < il; ++ i ) {


                const group = groups[ i ];


                const start = group.start;

                const count = group.count;


                for ( let j = start, jl = start + count; j < jl; j += 3 ) {


                    handleTriangle(

                        indices[ j + 0 ],

                        indices[ j + 1 ],

                        indices[ j + 2 ]

                    );


                }


            }


            const tmp = new Vector3(), tmp2 = new Vector3();

            const n = new Vector3(), n2 = new Vector3();


            function handleVertex( v ) {


                n.fromArray( normals, v * 3 );

                n2.copy( n );


                const t = tan1[ v ];


                // Gram-Schmidt orthogonalize


                tmp.copy( t );

                tmp.sub( n.multiplyScalar( n.dot( t ) ) ).normalize();


                // Calculate handedness


                tmp2.crossVectors( n2, t );

                const test = tmp2.dot( tan2[ v ] );

                const w = ( test < 0.0 ) ? - 1.0 : 1.0;


                tangents[ v * 4 ] = tmp.x;

                tangents[ v * 4 + 1 ] = tmp.y;

                tangents[ v * 4 + 2 ] = tmp.z;

                tangents[ v * 4 + 3 ] = w;


            }


            for ( let i = 0, il = groups.length; i < il; ++ i ) {


                const group = groups[ i ];


                const start = group.start;

                const count = group.count;


                for ( let j = start, jl = start + count; j < jl; j += 3 ) {


                    handleVertex( indices[ j + 0 ] );

                    handleVertex( indices[ j + 1 ] );

                    handleVertex( indices[ j + 2 ] );


                }


            }


        }


        computeVertexNormals() {


            const index = this.index;

            const positionAttribute = this.getAttribute( 'position' );


            if ( positionAttribute !== undefined ) {


                let normalAttribute = this.getAttribute( 'normal' );


                if ( normalAttribute === undefined ) {


                    normalAttribute = new BufferAttribute( new Float32Array( positionAttribute.count * 3 ), 3 );

                    this.setAttribute( 'normal', normalAttribute );


                } else {


                    // reset existing normals to zero


                    for ( let i = 0, il = normalAttribute.count; i < il; i ++ ) {


                        normalAttribute.setXYZ( i, 0, 0, 0 );


                    }


                }


                const pA = new Vector3(), pB = new Vector3(), pC = new Vector3();

                const nA = new Vector3(), nB = new Vector3(), nC = new Vector3();

                const cb = new Vector3(), ab = new Vector3();


                // indexed elements


                if ( index ) {


                    for ( let i = 0, il = index.count; i < il; i += 3 ) {


                        const vA = index.getX( i + 0 );

                        const vB = index.getX( i + 1 );

                        const vC = index.getX( i + 2 );


                        pA.fromBufferAttribute( positionAttribute, vA );

                        pB.fromBufferAttribute( positionAttribute, vB );

                        pC.fromBufferAttribute( positionAttribute, vC );


                        cb.subVectors( pC, pB );

                        ab.subVectors( pA, pB );

                        cb.cross( ab );


                        nA.fromBufferAttribute( normalAttribute, vA );

                        nB.fromBufferAttribute( normalAttribute, vB );

                        nC.fromBufferAttribute( normalAttribute, vC );


                        nA.add( cb );

                        nB.add( cb );

                        nC.add( cb );


                        normalAttribute.setXYZ( vA, nA.x, nA.y, nA.z );

                        normalAttribute.setXYZ( vB, nB.x, nB.y, nB.z );

                        normalAttribute.setXYZ( vC, nC.x, nC.y, nC.z );


                    }


                } else {


                    // non-indexed elements (unconnected triangle soup)


                    for ( let i = 0, il = positionAttribute.count; i < il; i += 3 ) {


                        pA.fromBufferAttribute( positionAttribute, i + 0 );

                        pB.fromBufferAttribute( positionAttribute, i + 1 );

                        pC.fromBufferAttribute( positionAttribute, i + 2 );


                        cb.subVectors( pC, pB );

                        ab.subVectors( pA, pB );

                        cb.cross( ab );


                        normalAttribute.setXYZ( i + 0, cb.x, cb.y, cb.z );

                        normalAttribute.setXYZ( i + 1, cb.x, cb.y, cb.z );

                        normalAttribute.setXYZ( i + 2, cb.x, cb.y, cb.z );


                    }


                }


                this.normalizeNormals();


                normalAttribute.needsUpdate = true;


            }


        }


        normalizeNormals() {


            const normals = this.attributes.normal;


            for ( let i = 0, il = normals.count; i < il; i ++ ) {


                _vector$8.fromBufferAttribute( normals, i );


                _vector$8.normalize();


                normals.setXYZ( i, _vector$8.x, _vector$8.y, _vector$8.z );


            }


        }


        toNonIndexed() {


            function convertBufferAttribute( attribute, indices ) {


                const array = attribute.array;

                const itemSize = attribute.itemSize;

                const normalized = attribute.normalized;


                const array2 = new array.constructor( indices.length * itemSize );


                let index = 0, index2 = 0;


                for ( let i = 0, l = indices.length; i < l; i ++ ) {


                    if ( attribute.isInterleavedBufferAttribute ) {


                        index = indices[ i ] * attribute.data.stride + attribute.offset;


                    } else {


                        index = indices[ i ] * itemSize;


                    }


                    for ( let j = 0; j < itemSize; j ++ ) {


                        array2[ index2 ++ ] = array[ index ++ ];


                    }


                }


                return new BufferAttribute( array2, itemSize, normalized );


            }


            //


            if ( this.index === null ) {


                console.warn( 'THREE.BufferGeometry.toNonIndexed(): BufferGeometry is already non-indexed.' );

                return this;


            }


            const geometry2 = new BufferGeometry();


            const indices = this.index.array;

            const attributes = this.attributes;


            // attributes


            for ( const name in attributes ) {


                const attribute = attributes[ name ];


                const newAttribute = convertBufferAttribute( attribute, indices );


                geometry2.setAttribute( name, newAttribute );


            }


            // morph attributes


            const morphAttributes = this.morphAttributes;


            for ( const name in morphAttributes ) {


                const morphArray = [];

                const morphAttribute = morphAttributes[ name ]; // morphAttribute: array of Float32BufferAttributes


                for ( let i = 0, il = morphAttribute.length; i < il; i ++ ) {


                    const attribute = morphAttribute[ i ];


                    const newAttribute = convertBufferAttribute( attribute, indices );


                    morphArray.push( newAttribute );


                }


                geometry2.morphAttributes[ name ] = morphArray;


            }


            geometry2.morphTargetsRelative = this.morphTargetsRelative;


            // groups


            const groups = this.groups;


            for ( let i = 0, l = groups.length; i < l; i ++ ) {


                const group = groups[ i ];

                geometry2.addGroup( group.start, group.count, group.materialIndex );


            }


            return geometry2;


        }


        toJSON() {


            const data = {

                metadata: {

                    version: 4.6,

                    type: 'BufferGeometry',

                    generator: 'BufferGeometry.toJSON'

                }

            };


            // standard BufferGeometry serialization


            data.uuid = this.uuid;

            data.type = this.type;

            if ( this.name !== '' ) data.name = this.name;

            if ( Object.keys( this.userData ).length > 0 ) data.userData = this.userData;


            if ( this.parameters !== undefined ) {


                const parameters = this.parameters;


                for ( const key in parameters ) {


                    if ( parameters[ key ] !== undefined ) data[ key ] = parameters[ key ];


                }


                return data;


            }


            // for simplicity the code assumes attributes are not shared across geometries, see #15811


            data.data = { attributes: {} };


            const index = this.index;


            if ( index !== null ) {


                data.data.index = {

                    type: index.array.constructor.name,

                    array: Array.prototype.slice.call( index.array )

                };


            }


            const attributes = this.attributes;


            for ( const key in attributes ) {


                const attribute = attributes[ key ];


                data.data.attributes[ key ] = attribute.toJSON( data.data );


            }


            const morphAttributes = {};

            let hasMorphAttributes = false;


            for ( const key in this.morphAttributes ) {


                const attributeArray = this.morphAttributes[ key ];


                const array = [];


                for ( let i = 0, il = attributeArray.length; i < il; i ++ ) {


                    const attribute = attributeArray[ i ];


                    array.push( attribute.toJSON( data.data ) );


                }


                if ( array.length > 0 ) {


                    morphAttributes[ key ] = array;


                    hasMorphAttributes = true;


                }


            }


            if ( hasMorphAttributes ) {


                data.data.morphAttributes = morphAttributes;

                data.data.morphTargetsRelative = this.morphTargetsRelative;


            }


            const groups = this.groups;


            if ( groups.length > 0 ) {


                data.data.groups = JSON.parse( JSON.stringify( groups ) );


            }


            const boundingSphere = this.boundingSphere;


            if ( boundingSphere !== null ) {


                data.data.boundingSphere = {

                    center: boundingSphere.center.toArray(),

                    radius: boundingSphere.radius

                };


            }


            return data;


        }


        clone() {


            return new this.constructor().copy( this );


        }


        copy( source ) {


            // reset


            this.index = null;

            this.attributes = {};

            this.morphAttributes = {};

            this.groups = [];

            this.boundingBox = null;

            this.boundingSphere = null;


            // used for storing cloned, shared data


            const data = {};


            // name


            this.name = source.name;


            // index


            const index = source.index;


            if ( index !== null ) {


                this.setIndex( index.clone( data ) );


            }


            // attributes


            const attributes = source.attributes;


            for ( const name in attributes ) {


                const attribute = attributes[ name ];

                this.setAttribute( name, attribute.clone( data ) );


            }


            // morph attributes


            const morphAttributes = source.morphAttributes;


            for ( const name in morphAttributes ) {


                const array = [];

                const morphAttribute = morphAttributes[ name ]; // morphAttribute: array of Float32BufferAttributes


                for ( let i = 0, l = morphAttribute.length; i < l; i ++ ) {


                    array.push( morphAttribute[ i ].clone( data ) );


                }


                this.morphAttributes[ name ] = array;


            }


            this.morphTargetsRelative = source.morphTargetsRelative;


            // groups


            const groups = source.groups;


            for ( let i = 0, l = groups.length; i < l; i ++ ) {


                const group = groups[ i ];

                this.addGroup( group.start, group.count, group.materialIndex );


            }


            // bounding box


            const boundingBox = source.boundingBox;


            if ( boundingBox !== null ) {


                this.boundingBox = boundingBox.clone();


            }


            // bounding sphere


            const boundingSphere = source.boundingSphere;


            if ( boundingSphere !== null ) {


                this.boundingSphere = boundingSphere.clone();


            }


            // draw range


            this.drawRange.start = source.drawRange.start;

            this.drawRange.count = source.drawRange.count;


            // user data


            this.userData = source.userData;


            return this;


        }


        dispose() {


            this.dispatchEvent( { type: 'dispose' } );


        }


    }


    const _inverseMatrix$3 = /*@__PURE__*/ new Matrix4();

    const _ray$3 = /*@__PURE__*/ new Ray();

    const _sphere$6 = /*@__PURE__*/ new Sphere();

    const _sphereHitAt = /*@__PURE__*/ new Vector3();


    const _vA$1 = /*@__PURE__*/ new Vector3();

    const _vB$1 = /*@__PURE__*/ new Vector3();

    const _vC$1 = /*@__PURE__*/ new Vector3();


    const _tempA = /*@__PURE__*/ new Vector3();

    const _morphA = /*@__PURE__*/ new Vector3();


    const _uvA$1 = /*@__PURE__*/ new Vector2();

    const _uvB$1 = /*@__PURE__*/ new Vector2();

    const _uvC$1 = /*@__PURE__*/ new Vector2();


    const _normalA = /*@__PURE__*/ new Vector3();

    const _normalB = /*@__PURE__*/ new Vector3();

    const _normalC = /*@__PURE__*/ new Vector3();


    const _intersectionPoint = /*@__PURE__*/ new Vector3();

    const _intersectionPointWorld = /*@__PURE__*/ new Vector3();


    class Mesh extends Object3D {


        constructor( geometry = new BufferGeometry(), material = new MeshBasicMaterial() ) {


            super();


            this.isMesh = true;


            this.type = 'Mesh';


            this.geometry = geometry;

            this.material = material;


            this.updateMorphTargets();


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            if ( source.morphTargetInfluences !== undefined ) {


                this.morphTargetInfluences = source.morphTargetInfluences.slice();


            }


            if ( source.morphTargetDictionary !== undefined ) {


                this.morphTargetDictionary = Object.assign( {}, source.morphTargetDictionary );


            }


            this.material = Array.isArray( source.material ) ? source.material.slice() : source.material;

            this.geometry = source.geometry;


            return this;


        }


        updateMorphTargets() {


            const geometry = this.geometry;


            const morphAttributes = geometry.morphAttributes;

            const keys = Object.keys( morphAttributes );


            if ( keys.length > 0 ) {


                const morphAttribute = morphAttributes[ keys[ 0 ] ];


                if ( morphAttribute !== undefined ) {


                    this.morphTargetInfluences = [];

                    this.morphTargetDictionary = {};


                    for ( let m = 0, ml = morphAttribute.length; m < ml; m ++ ) {


                        const name = morphAttribute[ m ].name || String( m );


                        this.morphTargetInfluences.push( 0 );

                        this.morphTargetDictionary[ name ] = m;


                    }


                }


            }


        }


        getVertexPosition( index, target ) {


            const geometry = this.geometry;

            const position = geometry.attributes.position;

            const morphPosition = geometry.morphAttributes.position;

            const morphTargetsRelative = geometry.morphTargetsRelative;


            target.fromBufferAttribute( position, index );


            const morphInfluences = this.morphTargetInfluences;


            if ( morphPosition && morphInfluences ) {


                _morphA.set( 0, 0, 0 );


                for ( let i = 0, il = morphPosition.length; i < il; i ++ ) {


                    const influence = morphInfluences[ i ];

                    const morphAttribute = morphPosition[ i ];


                    if ( influence === 0 ) continue;


                    _tempA.fromBufferAttribute( morphAttribute, index );


                    if ( morphTargetsRelative ) {


                        _morphA.addScaledVector( _tempA, influence );


                    } else {


                        _morphA.addScaledVector( _tempA.sub( target ), influence );


                    }


                }


                target.add( _morphA );


            }


            return target;


        }


        raycast( raycaster, intersects ) {


            const geometry = this.geometry;

            const material = this.material;

            const matrixWorld = this.matrixWorld;


            if ( material === undefined ) return;


            // test with bounding sphere in world space


            if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();


            _sphere$6.copy( geometry.boundingSphere );

            _sphere$6.applyMatrix4( matrixWorld );


            // check distance from ray origin to bounding sphere


            _ray$3.copy( raycaster.ray ).recast( raycaster.near );


            if ( _sphere$6.containsPoint( _ray$3.origin ) === false ) {


                if ( _ray$3.intersectSphere( _sphere$6, _sphereHitAt ) === null ) return;


                if ( _ray$3.origin.distanceToSquared( _sphereHitAt ) > ( raycaster.far - raycaster.near ) ** 2 ) return;


            }


            // convert ray to local space of mesh


            _inverseMatrix$3.copy( matrixWorld ).invert();

            _ray$3.copy( raycaster.ray ).applyMatrix4( _inverseMatrix$3 );


            // test with bounding box in local space


            if ( geometry.boundingBox !== null ) {


                if ( _ray$3.intersectsBox( geometry.boundingBox ) === false ) return;


            }


            // test for intersections with geometry


            this._computeIntersections( raycaster, intersects, _ray$3 );


        }


        _computeIntersections( raycaster, intersects, rayLocalSpace ) {


            let intersection;


            const geometry = this.geometry;

            const material = this.material;


            const index = geometry.index;

            const position = geometry.attributes.position;

            const uv = geometry.attributes.uv;

            const uv1 = geometry.attributes.uv1;

            const normal = geometry.attributes.normal;

            const groups = geometry.groups;

            const drawRange = geometry.drawRange;


            if ( index !== null ) {


                // indexed buffer geometry


                if ( Array.isArray( material ) ) {


                    for ( let i = 0, il = groups.length; i < il; i ++ ) {


                        const group = groups[ i ];

                        const groupMaterial = material[ group.materialIndex ];


                        const start = Math.max( group.start, drawRange.start );

                        const end = Math.min( index.count, Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) ) );


                        for ( let j = start, jl = end; j < jl; j += 3 ) {


                            const a = index.getX( j );

                            const b = index.getX( j + 1 );

                            const c = index.getX( j + 2 );


                            intersection = checkGeometryIntersection( this, groupMaterial, raycaster, rayLocalSpace, uv, uv1, normal, a, b, c );


                            if ( intersection ) {


                                intersection.faceIndex = Math.floor( j / 3 ); // triangle number in indexed buffer semantics

                                intersection.face.materialIndex = group.materialIndex;

                                intersects.push( intersection );


                            }


                        }


                    }


                } else {


                    const start = Math.max( 0, drawRange.start );

                    const end = Math.min( index.count, ( drawRange.start + drawRange.count ) );


                    for ( let i = start, il = end; i < il; i += 3 ) {


                        const a = index.getX( i );

                        const b = index.getX( i + 1 );

                        const c = index.getX( i + 2 );


                        intersection = checkGeometryIntersection( this, material, raycaster, rayLocalSpace, uv, uv1, normal, a, b, c );


                        if ( intersection ) {


                            intersection.faceIndex = Math.floor( i / 3 ); // triangle number in indexed buffer semantics

                            intersects.push( intersection );


                        }


                    }


                }


            } else if ( position !== undefined ) {


                // non-indexed buffer geometry


                if ( Array.isArray( material ) ) {


                    for ( let i = 0, il = groups.length; i < il; i ++ ) {


                        const group = groups[ i ];

                        const groupMaterial = material[ group.materialIndex ];


                        const start = Math.max( group.start, drawRange.start );

                        const end = Math.min( position.count, Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) ) );


                        for ( let j = start, jl = end; j < jl; j += 3 ) {


                            const a = j;

                            const b = j + 1;

                            const c = j + 2;


                            intersection = checkGeometryIntersection( this, groupMaterial, raycaster, rayLocalSpace, uv, uv1, normal, a, b, c );


                            if ( intersection ) {


                                intersection.faceIndex = Math.floor( j / 3 ); // triangle number in non-indexed buffer semantics

                                intersection.face.materialIndex = group.materialIndex;

                                intersects.push( intersection );


                            }


                        }


                    }


                } else {


                    const start = Math.max( 0, drawRange.start );

                    const end = Math.min( position.count, ( drawRange.start + drawRange.count ) );


                    for ( let i = start, il = end; i < il; i += 3 ) {


                        const a = i;

                        const b = i + 1;

                        const c = i + 2;


                        intersection = checkGeometryIntersection( this, material, raycaster, rayLocalSpace, uv, uv1, normal, a, b, c );


                        if ( intersection ) {


                            intersection.faceIndex = Math.floor( i / 3 ); // triangle number in non-indexed buffer semantics

                            intersects.push( intersection );


                        }


                    }


                }


            }


        }


    }


    function checkIntersection( object, material, raycaster, ray, pA, pB, pC, point ) {


        let intersect;


        if ( material.side === BackSide ) {


            intersect = ray.intersectTriangle( pC, pB, pA, true, point );


        } else {


            intersect = ray.intersectTriangle( pA, pB, pC, ( material.side === FrontSide ), point );


        }


        if ( intersect === null ) return null;


        _intersectionPointWorld.copy( point );

        _intersectionPointWorld.applyMatrix4( object.matrixWorld );


        const distance = raycaster.ray.origin.distanceTo( _intersectionPointWorld );


        if ( distance < raycaster.near || distance > raycaster.far ) return null;


        return {

            distance: distance,

            point: _intersectionPointWorld.clone(),

            object: object

        };


    }


    function checkGeometryIntersection( object, material, raycaster, ray, uv, uv1, normal, a, b, c ) {


        object.getVertexPosition( a, _vA$1 );

        object.getVertexPosition( b, _vB$1 );

        object.getVertexPosition( c, _vC$1 );


        const intersection = checkIntersection( object, material, raycaster, ray, _vA$1, _vB$1, _vC$1, _intersectionPoint );


        if ( intersection ) {


            if ( uv ) {


                _uvA$1.fromBufferAttribute( uv, a );

                _uvB$1.fromBufferAttribute( uv, b );

                _uvC$1.fromBufferAttribute( uv, c );


                intersection.uv = Triangle.getInterpolation( _intersectionPoint, _vA$1, _vB$1, _vC$1, _uvA$1, _uvB$1, _uvC$1, new Vector2() );


            }


            if ( uv1 ) {


                _uvA$1.fromBufferAttribute( uv1, a );

                _uvB$1.fromBufferAttribute( uv1, b );

                _uvC$1.fromBufferAttribute( uv1, c );


                intersection.uv1 = Triangle.getInterpolation( _intersectionPoint, _vA$1, _vB$1, _vC$1, _uvA$1, _uvB$1, _uvC$1, new Vector2() );

                intersection.uv2 = intersection.uv1; // @deprecated, r152


            }


            if ( normal ) {


                _normalA.fromBufferAttribute( normal, a );

                _normalB.fromBufferAttribute( normal, b );

                _normalC.fromBufferAttribute( normal, c );


                intersection.normal = Triangle.getInterpolation( _intersectionPoint, _vA$1, _vB$1, _vC$1, _normalA, _normalB, _normalC, new Vector3() );


                if ( intersection.normal.dot( ray.direction ) > 0 ) {


                    intersection.normal.multiplyScalar( - 1 );


                }


            }


            const face = {

                a: a,

                b: b,

                c: c,

                normal: new Vector3(),

                materialIndex: 0

            };


            Triangle.getNormal( _vA$1, _vB$1, _vC$1, face.normal );


            intersection.face = face;


        }


        return intersection;


    }


    class BoxGeometry extends BufferGeometry {


        constructor( width = 1, height = 1, depth = 1, widthSegments = 1, heightSegments = 1, depthSegments = 1 ) {


            super();


            this.type = 'BoxGeometry';


            this.parameters = {

                width: width,

                height: height,

                depth: depth,

                widthSegments: widthSegments,

                heightSegments: heightSegments,

                depthSegments: depthSegments

            };


            const scope = this;


            // segments


            widthSegments = Math.floor( widthSegments );

            heightSegments = Math.floor( heightSegments );

            depthSegments = Math.floor( depthSegments );


            // buffers


            const indices = [];

            const vertices = [];

            const normals = [];

            const uvs = [];


            // helper variables


            let numberOfVertices = 0;

            let groupStart = 0;


            // build each side of the box geometry


            buildPlane( 'z', 'y', 'x', - 1, - 1, depth, height, width, depthSegments, heightSegments, 0 ); // px

            buildPlane( 'z', 'y', 'x', 1, - 1, depth, height, - width, depthSegments, heightSegments, 1 ); // nx

            buildPlane( 'x', 'z', 'y', 1, 1, width, depth, height, widthSegments, depthSegments, 2 ); // py

            buildPlane( 'x', 'z', 'y', 1, - 1, width, depth, - height, widthSegments, depthSegments, 3 ); // ny

            buildPlane( 'x', 'y', 'z', 1, - 1, width, height, depth, widthSegments, heightSegments, 4 ); // pz

            buildPlane( 'x', 'y', 'z', - 1, - 1, width, height, - depth, widthSegments, heightSegments, 5 ); // nz


            // build geometry


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


            function buildPlane( u, v, w, udir, vdir, width, height, depth, gridX, gridY, materialIndex ) {


                const segmentWidth = width / gridX;

                const segmentHeight = height / gridY;


                const widthHalf = width / 2;

                const heightHalf = height / 2;

                const depthHalf = depth / 2;


                const gridX1 = gridX + 1;

                const gridY1 = gridY + 1;


                let vertexCounter = 0;

                let groupCount = 0;


                const vector = new Vector3();


                // generate vertices, normals and uvs


                for ( let iy = 0; iy < gridY1; iy ++ ) {


                    const y = iy * segmentHeight - heightHalf;


                    for ( let ix = 0; ix < gridX1; ix ++ ) {


                        const x = ix * segmentWidth - widthHalf;


                        // set values to correct vector component


                        vector[ u ] = x * udir;

                        vector[ v ] = y * vdir;

                        vector[ w ] = depthHalf;


                        // now apply vector to vertex buffer


                        vertices.push( vector.x, vector.y, vector.z );


                        // set values to correct vector component


                        vector[ u ] = 0;

                        vector[ v ] = 0;

                        vector[ w ] = depth > 0 ? 1 : - 1;


                        // now apply vector to normal buffer


                        normals.push( vector.x, vector.y, vector.z );


                        // uvs


                        uvs.push( ix / gridX );

                        uvs.push( 1 - ( iy / gridY ) );


                        // counters


                        vertexCounter += 1;


                    }


                }


                // indices


                // 1. you need three indices to draw a single face

                // 2. a single segment consists of two faces

                // 3. so we need to generate six (2*3) indices per segment


                for ( let iy = 0; iy < gridY; iy ++ ) {


                    for ( let ix = 0; ix < gridX; ix ++ ) {


                        const a = numberOfVertices + ix + gridX1 * iy;

                        const b = numberOfVertices + ix + gridX1 * ( iy + 1 );

                        const c = numberOfVertices + ( ix + 1 ) + gridX1 * ( iy + 1 );

                        const d = numberOfVertices + ( ix + 1 ) + gridX1 * iy;


                        // faces


                        indices.push( a, b, d );

                        indices.push( b, c, d );


                        // increase counter


                        groupCount += 6;


                    }


                }


                // add a group to the geometry. this will ensure multi material support


                scope.addGroup( groupStart, groupCount, materialIndex );


                // calculate new start value for groups


                groupStart += groupCount;


                // update total number of vertices


                numberOfVertices += vertexCounter;


            }


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        static fromJSON( data ) {


            return new BoxGeometry( data.width, data.height, data.depth, data.widthSegments, data.heightSegments, data.depthSegments );


        }


    }


    function cloneUniforms( src ) {


        const dst = {};


        for ( const u in src ) {


            dst[ u ] = {};


            for ( const p in src[ u ] ) {


                const property = src[ u ][ p ];


                if ( property && ( property.isColor ||

                    property.isMatrix3 || property.isMatrix4 ||

                    property.isVector2 || property.isVector3 || property.isVector4 ||

                    property.isTexture || property.isQuaternion ) ) {


                    if ( property.isRenderTargetTexture ) {


                        console.warn( 'UniformsUtils: Textures of render targets cannot be cloned via cloneUniforms() or mergeUniforms().' );

                        dst[ u ][ p ] = null;


                    } else {


                        dst[ u ][ p ] = property.clone();


                    }


                } else if ( Array.isArray( property ) ) {


                    dst[ u ][ p ] = property.slice();


                } else {


                    dst[ u ][ p ] = property;


                }


            }


        }


        return dst;


    }


    function mergeUniforms( uniforms ) {


        const merged = {};


        for ( let u = 0; u < uniforms.length; u ++ ) {


            const tmp = cloneUniforms( uniforms[ u ] );


            for ( const p in tmp ) {


                merged[ p ] = tmp[ p ];


            }


        }


        return merged;


    }


    function cloneUniformsGroups( src ) {


        const dst = [];


        for ( let u = 0; u < src.length; u ++ ) {


            dst.push( src[ u ].clone() );


        }


        return dst;


    }


    function getUnlitUniformColorSpace( renderer ) {


        if ( renderer.getRenderTarget() === null ) {


            // https://github.com/mrdoob/three.js/pull/23937#issuecomment-1111067398

            return renderer.outputColorSpace;


        }


        return ColorManagement.workingColorSpace;


    }


    // Legacy


    const UniformsUtils = { clone: cloneUniforms, merge: mergeUniforms };


    var default_vertex = "void main() {\n\tgl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n}";


    var default_fragment = "void main() {\n\tgl_FragColor = vec4( 1.0, 0.0, 0.0, 1.0 );\n}";


    class ShaderMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isShaderMaterial = true;


            this.type = 'ShaderMaterial';


            this.defines = {};

            this.uniforms = {};

            this.uniformsGroups = [];


            this.vertexShader = default_vertex;

            this.fragmentShader = default_fragment;


            this.linewidth = 1;


            this.wireframe = false;

            this.wireframeLinewidth = 1;


            this.fog = false; // set to use scene fog

            this.lights = false; // set to use scene lights

            this.clipping = false; // set to use user-defined clipping planes


            this.forceSinglePass = true;


            this.extensions = {

                derivatives: false, // set to use derivatives

                fragDepth: false, // set to use fragment depth values

                drawBuffers: false, // set to use draw buffers

                shaderTextureLOD: false, // set to use shader texture LOD

                clipCullDistance: false // set to use vertex shader clipping

            };


            // When rendered geometry doesn't include these attributes but the material does,

            // use these default values in WebGL. This avoids errors when buffer data is missing.

            this.defaultAttributeValues = {

                'color': [ 1, 1, 1 ],

                'uv': [ 0, 0 ],

                'uv1': [ 0, 0 ]

            };


            this.index0AttributeName = undefined;

            this.uniformsNeedUpdate = false;


            this.glslVersion = null;


            if ( parameters !== undefined ) {


                this.setValues( parameters );


            }


        }


        copy( source ) {


            super.copy( source );


            this.fragmentShader = source.fragmentShader;

            this.vertexShader = source.vertexShader;


            this.uniforms = cloneUniforms( source.uniforms );

            this.uniformsGroups = cloneUniformsGroups( source.uniformsGroups );


            this.defines = Object.assign( {}, source.defines );


            this.wireframe = source.wireframe;

            this.wireframeLinewidth = source.wireframeLinewidth;


            this.fog = source.fog;

            this.lights = source.lights;

            this.clipping = source.clipping;


            this.extensions = Object.assign( {}, source.extensions );


            this.glslVersion = source.glslVersion;


            return this;


        }


        toJSON( meta ) {


            const data = super.toJSON( meta );


            data.glslVersion = this.glslVersion;

            data.uniforms = {};


            for ( const name in this.uniforms ) {


                const uniform = this.uniforms[ name ];

                const value = uniform.value;


                if ( value && value.isTexture ) {


                    data.uniforms[ name ] = {

                        type: 't',

                        value: value.toJSON( meta ).uuid

                    };


                } else if ( value && value.isColor ) {


                    data.uniforms[ name ] = {

                        type: 'c',

                        value: value.getHex()

                    };


                } else if ( value && value.isVector2 ) {


                    data.uniforms[ name ] = {

                        type: 'v2',

                        value: value.toArray()

                    };


                } else if ( value && value.isVector3 ) {


                    data.uniforms[ name ] = {

                        type: 'v3',

                        value: value.toArray()

                    };


                } else if ( value && value.isVector4 ) {


                    data.uniforms[ name ] = {

                        type: 'v4',

                        value: value.toArray()

                    };


                } else if ( value && value.isMatrix3 ) {


                    data.uniforms[ name ] = {

                        type: 'm3',

                        value: value.toArray()

                    };


                } else if ( value && value.isMatrix4 ) {


                    data.uniforms[ name ] = {

                        type: 'm4',

                        value: value.toArray()

                    };


                } else {


                    data.uniforms[ name ] = {

                        value: value

                    };


                    // note: the array variants v2v, v3v, v4v, m4v and tv are not supported so far


                }


            }


            if ( Object.keys( this.defines ).length > 0 ) data.defines = this.defines;


            data.vertexShader = this.vertexShader;

            data.fragmentShader = this.fragmentShader;


            data.lights = this.lights;

            data.clipping = this.clipping;


            const extensions = {};


            for ( const key in this.extensions ) {


                if ( this.extensions[ key ] === true ) extensions[ key ] = true;


            }


            if ( Object.keys( extensions ).length > 0 ) data.extensions = extensions;


            return data;


        }


    }


    class Camera extends Object3D {


        constructor() {


            super();


            this.isCamera = true;


            this.type = 'Camera';


            this.matrixWorldInverse = new Matrix4();


            this.projectionMatrix = new Matrix4();

            this.projectionMatrixInverse = new Matrix4();


            this.coordinateSystem = WebGLCoordinateSystem;


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.matrixWorldInverse.copy( source.matrixWorldInverse );


            this.projectionMatrix.copy( source.projectionMatrix );

            this.projectionMatrixInverse.copy( source.projectionMatrixInverse );


            this.coordinateSystem = source.coordinateSystem;


            return this;


        }


        getWorldDirection( target ) {


            return super.getWorldDirection( target ).negate();


        }


        updateMatrixWorld( force ) {


            super.updateMatrixWorld( force );


            this.matrixWorldInverse.copy( this.matrixWorld ).invert();


        }


        updateWorldMatrix( updateParents, updateChildren ) {


            super.updateWorldMatrix( updateParents, updateChildren );


            this.matrixWorldInverse.copy( this.matrixWorld ).invert();


        }


        clone() {


            return new this.constructor().copy( this );


        }


    }


    class PerspectiveCamera extends Camera {


        constructor( fov = 50, aspect = 1, near = 0.1, far = 2000 ) {


            super();


            this.isPerspectiveCamera = true;


            this.type = 'PerspectiveCamera';


            this.fov = fov;

            this.zoom = 1;


            this.near = near;

            this.far = far;

            this.focus = 10;


            this.aspect = aspect;

            this.view = null;


            this.filmGauge = 35;    // width of the film (default in millimeters)

            this.filmOffset = 0;    // horizontal film offset (same unit as gauge)


            this.updateProjectionMatrix();


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.fov = source.fov;

            this.zoom = source.zoom;


            this.near = source.near;

            this.far = source.far;

            this.focus = source.focus;


            this.aspect = source.aspect;

            this.view = source.view === null ? null : Object.assign( {}, source.view );


            this.filmGauge = source.filmGauge;

            this.filmOffset = source.filmOffset;


            return this;


        }


        setFocalLength( focalLength ) {


            const vExtentSlope = 0.5 * this.getFilmHeight() / focalLength;


            this.fov = RAD2DEG * 2 * Math.atan( vExtentSlope );

            this.updateProjectionMatrix();


        }


        getFocalLength() {


            const vExtentSlope = Math.tan( DEG2RAD * 0.5 * this.fov );


            return 0.5 * this.getFilmHeight() / vExtentSlope;


        }


        getEffectiveFOV() {


            return RAD2DEG * 2 * Math.atan(

                Math.tan( DEG2RAD * 0.5 * this.fov ) / this.zoom );


        }


        getFilmWidth() {


            // film not completely covered in portrait format (aspect < 1)

            return this.filmGauge * Math.min( this.aspect, 1 );


        }


        getFilmHeight() {


            // film not completely covered in landscape format (aspect > 1)

            return this.filmGauge / Math.max( this.aspect, 1 );


        }


        setViewOffset( fullWidth, fullHeight, x, y, width, height ) {


            this.aspect = fullWidth / fullHeight;


            if ( this.view === null ) {


                this.view = {

                    enabled: true,

                    fullWidth: 1,

                    fullHeight: 1,

                    offsetX: 0,

                    offsetY: 0,

                    width: 1,

                    height: 1

                };


            }


            this.view.enabled = true;

            this.view.fullWidth = fullWidth;

            this.view.fullHeight = fullHeight;

            this.view.offsetX = x;

            this.view.offsetY = y;

            this.view.width = width;

            this.view.height = height;


            this.updateProjectionMatrix();


        }


        clearViewOffset() {


            if ( this.view !== null ) {


                this.view.enabled = false;


            }


            this.updateProjectionMatrix();


        }


        updateProjectionMatrix() {


            const near = this.near;

            let top = near * Math.tan( DEG2RAD * 0.5 * this.fov ) / this.zoom;

            let height = 2 * top;

            let width = this.aspect * height;

            let left = - 0.5 * width;

            const view = this.view;


            if ( this.view !== null && this.view.enabled ) {


                const fullWidth = view.fullWidth,

                    fullHeight = view.fullHeight;


                left += view.offsetX * width / fullWidth;

                top -= view.offsetY * height / fullHeight;

                width *= view.width / fullWidth;

                height *= view.height / fullHeight;


            }


            const skew = this.filmOffset;

            if ( skew !== 0 ) left += near * skew / this.getFilmWidth();


            this.projectionMatrix.makePerspective( left, left + width, top, top - height, near, this.far, this.coordinateSystem );


            this.projectionMatrixInverse.copy( this.projectionMatrix ).invert();


        }


        toJSON( meta ) {


            const data = super.toJSON( meta );


            data.object.fov = this.fov;

            data.object.zoom = this.zoom;


            data.object.near = this.near;

            data.object.far = this.far;

            data.object.focus = this.focus;


            data.object.aspect = this.aspect;


            if ( this.view !== null ) data.object.view = Object.assign( {}, this.view );


            data.object.filmGauge = this.filmGauge;

            data.object.filmOffset = this.filmOffset;


            return data;


        }


    }


    const fov = - 90; // negative fov is not an error

    const aspect = 1;


    class CubeCamera extends Object3D {


        constructor( near, far, renderTarget ) {


            super();


            this.type = 'CubeCamera';


            this.renderTarget = renderTarget;

            this.coordinateSystem = null;

            this.activeMipmapLevel = 0;


            const cameraPX = new PerspectiveCamera( fov, aspect, near, far );

            cameraPX.layers = this.layers;

            this.add( cameraPX );


            const cameraNX = new PerspectiveCamera( fov, aspect, near, far );

            cameraNX.layers = this.layers;

            this.add( cameraNX );


            const cameraPY = new PerspectiveCamera( fov, aspect, near, far );

            cameraPY.layers = this.layers;

            this.add( cameraPY );


            const cameraNY = new PerspectiveCamera( fov, aspect, near, far );

            cameraNY.layers = this.layers;

            this.add( cameraNY );


            const cameraPZ = new PerspectiveCamera( fov, aspect, near, far );

            cameraPZ.layers = this.layers;

            this.add( cameraPZ );


            const cameraNZ = new PerspectiveCamera( fov, aspect, near, far );

            cameraNZ.layers = this.layers;

            this.add( cameraNZ );


        }


        updateCoordinateSystem() {


            const coordinateSystem = this.coordinateSystem;


            const cameras = this.children.concat();


            const [ cameraPX, cameraNX, cameraPY, cameraNY, cameraPZ, cameraNZ ] = cameras;


            for ( const camera of cameras ) this.remove( camera );


            if ( coordinateSystem === WebGLCoordinateSystem ) {


                cameraPX.up.set( 0, 1, 0 );

                cameraPX.lookAt( 1, 0, 0 );


                cameraNX.up.set( 0, 1, 0 );

                cameraNX.lookAt( - 1, 0, 0 );


                cameraPY.up.set( 0, 0, - 1 );

                cameraPY.lookAt( 0, 1, 0 );


                cameraNY.up.set( 0, 0, 1 );

                cameraNY.lookAt( 0, - 1, 0 );


                cameraPZ.up.set( 0, 1, 0 );

                cameraPZ.lookAt( 0, 0, 1 );


                cameraNZ.up.set( 0, 1, 0 );

                cameraNZ.lookAt( 0, 0, - 1 );


            } else if ( coordinateSystem === WebGPUCoordinateSystem ) {


                cameraPX.up.set( 0, - 1, 0 );

                cameraPX.lookAt( - 1, 0, 0 );


                cameraNX.up.set( 0, - 1, 0 );

                cameraNX.lookAt( 1, 0, 0 );


                cameraPY.up.set( 0, 0, 1 );

                cameraPY.lookAt( 0, 1, 0 );


                cameraNY.up.set( 0, 0, - 1 );

                cameraNY.lookAt( 0, - 1, 0 );


                cameraPZ.up.set( 0, - 1, 0 );

                cameraPZ.lookAt( 0, 0, 1 );


                cameraNZ.up.set( 0, - 1, 0 );

                cameraNZ.lookAt( 0, 0, - 1 );


            } else {


                throw new Error( 'THREE.CubeCamera.updateCoordinateSystem(): Invalid coordinate system: ' + coordinateSystem );


            }


            for ( const camera of cameras ) {


                this.add( camera );


                camera.updateMatrixWorld();


            }


        }


        update( renderer, scene ) {


            if ( this.parent === null ) this.updateMatrixWorld();


            const { renderTarget, activeMipmapLevel } = this;


            if ( this.coordinateSystem !== renderer.coordinateSystem ) {


                this.coordinateSystem = renderer.coordinateSystem;


                this.updateCoordinateSystem();


            }


            const [ cameraPX, cameraNX, cameraPY, cameraNY, cameraPZ, cameraNZ ] = this.children;


            const currentRenderTarget = renderer.getRenderTarget();

            const currentActiveCubeFace = renderer.getActiveCubeFace();

            const currentActiveMipmapLevel = renderer.getActiveMipmapLevel();


            const currentXrEnabled = renderer.xr.enabled;


            renderer.xr.enabled = false;


            const generateMipmaps = renderTarget.texture.generateMipmaps;


            renderTarget.texture.generateMipmaps = false;


            renderer.setRenderTarget( renderTarget, 0, activeMipmapLevel );

            renderer.render( scene, cameraPX );


            renderer.setRenderTarget( renderTarget, 1, activeMipmapLevel );

            renderer.render( scene, cameraNX );


            renderer.setRenderTarget( renderTarget, 2, activeMipmapLevel );

            renderer.render( scene, cameraPY );


            renderer.setRenderTarget( renderTarget, 3, activeMipmapLevel );

            renderer.render( scene, cameraNY );


            renderer.setRenderTarget( renderTarget, 4, activeMipmapLevel );

            renderer.render( scene, cameraPZ );


            // mipmaps are generated during the last call of render()

            // at this point, all sides of the cube render target are defined


            renderTarget.texture.generateMipmaps = generateMipmaps;


            renderer.setRenderTarget( renderTarget, 5, activeMipmapLevel );

            renderer.render( scene, cameraNZ );


            renderer.setRenderTarget( currentRenderTarget, currentActiveCubeFace, currentActiveMipmapLevel );


            renderer.xr.enabled = currentXrEnabled;


            renderTarget.texture.needsPMREMUpdate = true;


        }


    }


    class CubeTexture extends Texture {


        constructor( images, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, colorSpace ) {


            images = images !== undefined ? images : [];

            mapping = mapping !== undefined ? mapping : CubeReflectionMapping;


            super( images, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, colorSpace );


            this.isCubeTexture = true;


            this.flipY = false;


        }


        get images() {


            return this.image;


        }


        set images( value ) {


            this.image = value;


        }


    }


    class WebGLCubeRenderTarget extends WebGLRenderTarget {


        constructor( size = 1, options = {} ) {


            super( size, size, options );


            this.isWebGLCubeRenderTarget = true;


            const image = { width: size, height: size, depth: 1 };

            const images = [ image, image, image, image, image, image ];


            if ( options.encoding !== undefined ) {


                // @deprecated, r152

                warnOnce( 'THREE.WebGLCubeRenderTarget: option.encoding has been replaced by option.colorSpace.' );

                options.colorSpace = options.encoding === sRGBEncoding ? SRGBColorSpace : NoColorSpace;


            }


            this.texture = new CubeTexture( images, options.mapping, options.wrapS, options.wrapT, options.magFilter, options.minFilter, options.format, options.type, options.anisotropy, options.colorSpace );


            // By convention -- likely based on the RenderMan spec from the 1990's -- cube maps are specified by WebGL (and three.js)

            // in a coordinate system in which positive-x is to the right when looking up the positive-z axis -- in other words,

            // in a left-handed coordinate system. By continuing this convention, preexisting cube maps continued to render correctly.


            // three.js uses a right-handed coordinate system. So environment maps used in three.js appear to have px and nx swapped

            // and the flag isRenderTargetTexture controls this conversion. The flip is not required when using WebGLCubeRenderTarget.texture

            // as a cube texture (this is detected when isRenderTargetTexture is set to true for cube textures).


            this.texture.isRenderTargetTexture = true;


            this.texture.generateMipmaps = options.generateMipmaps !== undefined ? options.generateMipmaps : false;

            this.texture.minFilter = options.minFilter !== undefined ? options.minFilter : LinearFilter;


        }


        fromEquirectangularTexture( renderer, texture ) {


            this.texture.type = texture.type;

            this.texture.colorSpace = texture.colorSpace;


            this.texture.generateMipmaps = texture.generateMipmaps;

            this.texture.minFilter = texture.minFilter;

            this.texture.magFilter = texture.magFilter;


            const shader = {


                uniforms: {

                    tEquirect: { value: null },

                },


                vertexShader: /* glsl */`


                varying vec3 vWorldDirection;


                vec3 transformDirection( in vec3 dir, in mat4 matrix ) {


                    return normalize( ( matrix * vec4( dir, 0.0 ) ).xyz );


                }


                void main() {


                    vWorldDirection = transformDirection( position, modelMatrix );


                    #include <begin_vertex>

                    #include <project_vertex>


                }

            `,


                fragmentShader: /* glsl */`


                uniform sampler2D tEquirect;


                varying vec3 vWorldDirection;


                #include <common>


                void main() {


                    vec3 direction = normalize( vWorldDirection );


                    vec2 sampleUV = equirectUv( direction );


                    gl_FragColor = texture2D( tEquirect, sampleUV );


                }

            `

            };


            const geometry = new BoxGeometry( 5, 5, 5 );


            const material = new ShaderMaterial( {


                name: 'CubemapFromEquirect',


                uniforms: cloneUniforms( shader.uniforms ),

                vertexShader: shader.vertexShader,

                fragmentShader: shader.fragmentShader,

                side: BackSide,

                blending: NoBlending


            } );


            material.uniforms.tEquirect.value = texture;


            const mesh = new Mesh( geometry, material );


            const currentMinFilter = texture.minFilter;


            // Avoid blurred poles

            if ( texture.minFilter === LinearMipmapLinearFilter ) texture.minFilter = LinearFilter;


            const camera = new CubeCamera( 1, 10, this );

            camera.update( renderer, mesh );


            texture.minFilter = currentMinFilter;


            mesh.geometry.dispose();

            mesh.material.dispose();


            return this;


        }


        clear( renderer, color, depth, stencil ) {


            const currentRenderTarget = renderer.getRenderTarget();


            for ( let i = 0; i < 6; i ++ ) {


                renderer.setRenderTarget( this, i );


                renderer.clear( color, depth, stencil );


            }


            renderer.setRenderTarget( currentRenderTarget );


        }


    }


    const _vector1 = /*@__PURE__*/ new Vector3();

    const _vector2 = /*@__PURE__*/ new Vector3();

    const _normalMatrix = /*@__PURE__*/ new Matrix3();


    class Plane {


        constructor( normal = new Vector3( 1, 0, 0 ), constant = 0 ) {


            this.isPlane = true;


            // normal is assumed to be normalized


            this.normal = normal;

            this.constant = constant;


        }


        set( normal, constant ) {


            this.normal.copy( normal );

            this.constant = constant;


            return this;


        }


        setComponents( x, y, z, w ) {


            this.normal.set( x, y, z );

            this.constant = w;


            return this;


        }


        setFromNormalAndCoplanarPoint( normal, point ) {


            this.normal.copy( normal );

            this.constant = - point.dot( this.normal );


            return this;


        }


        setFromCoplanarPoints( a, b, c ) {


            const normal = _vector1.subVectors( c, b ).cross( _vector2.subVectors( a, b ) ).normalize();


            // Q: should an error be thrown if normal is zero (e.g. degenerate plane)?


            this.setFromNormalAndCoplanarPoint( normal, a );


            return this;


        }


        copy( plane ) {


            this.normal.copy( plane.normal );

            this.constant = plane.constant;


            return this;


        }


        normalize() {


            // Note: will lead to a divide by zero if the plane is invalid.


            const inverseNormalLength = 1.0 / this.normal.length();

            this.normal.multiplyScalar( inverseNormalLength );

            this.constant *= inverseNormalLength;


            return this;


        }


        negate() {


            this.constant *= - 1;

            this.normal.negate();


            return this;


        }


        distanceToPoint( point ) {


            return this.normal.dot( point ) + this.constant;


        }


        distanceToSphere( sphere ) {


            return this.distanceToPoint( sphere.center ) - sphere.radius;


        }


        projectPoint( point, target ) {


            return target.copy( point ).addScaledVector( this.normal, - this.distanceToPoint( point ) );


        }


        intersectLine( line, target ) {


            const direction = line.delta( _vector1 );


            const denominator = this.normal.dot( direction );


            if ( denominator === 0 ) {


                // line is coplanar, return origin

                if ( this.distanceToPoint( line.start ) === 0 ) {


                    return target.copy( line.start );


                }


                // Unsure if this is the correct method to handle this case.

                return null;


            }


            const t = - ( line.start.dot( this.normal ) + this.constant ) / denominator;


            if ( t < 0 || t > 1 ) {


                return null;


            }


            return target.copy( line.start ).addScaledVector( direction, t );


        }


        intersectsLine( line ) {


            // Note: this tests if a line intersects the plane, not whether it (or its end-points) are coplanar with it.


            const startSign = this.distanceToPoint( line.start );

            const endSign = this.distanceToPoint( line.end );


            return ( startSign < 0 && endSign > 0 ) || ( endSign < 0 && startSign > 0 );


        }


        intersectsBox( box ) {


            return box.intersectsPlane( this );


        }


        intersectsSphere( sphere ) {


            return sphere.intersectsPlane( this );


        }


        coplanarPoint( target ) {


            return target.copy( this.normal ).multiplyScalar( - this.constant );


        }


        applyMatrix4( matrix, optionalNormalMatrix ) {


            const normalMatrix = optionalNormalMatrix || _normalMatrix.getNormalMatrix( matrix );


            const referencePoint = this.coplanarPoint( _vector1 ).applyMatrix4( matrix );


            const normal = this.normal.applyMatrix3( normalMatrix ).normalize();


            this.constant = - referencePoint.dot( normal );


            return this;


        }


        translate( offset ) {


            this.constant -= offset.dot( this.normal );


            return this;


        }


        equals( plane ) {


            return plane.normal.equals( this.normal ) && ( plane.constant === this.constant );


        }


        clone() {


            return new this.constructor().copy( this );


        }


    }


    const _sphere$5 = /*@__PURE__*/ new Sphere();

    const _vector$7 = /*@__PURE__*/ new Vector3();


    class Frustum {


        constructor( p0 = new Plane(), p1 = new Plane(), p2 = new Plane(), p3 = new Plane(), p4 = new Plane(), p5 = new Plane() ) {


            this.planes = [ p0, p1, p2, p3, p4, p5 ];


        }


        set( p0, p1, p2, p3, p4, p5 ) {


            const planes = this.planes;


            planes[ 0 ].copy( p0 );

            planes[ 1 ].copy( p1 );

            planes[ 2 ].copy( p2 );

            planes[ 3 ].copy( p3 );

            planes[ 4 ].copy( p4 );

            planes[ 5 ].copy( p5 );


            return this;


        }


        copy( frustum ) {


            const planes = this.planes;


            for ( let i = 0; i < 6; i ++ ) {


                planes[ i ].copy( frustum.planes[ i ] );


            }


            return this;


        }


        setFromProjectionMatrix( m, coordinateSystem = WebGLCoordinateSystem ) {


            const planes = this.planes;

            const me = m.elements;

            const me0 = me[ 0 ], me1 = me[ 1 ], me2 = me[ 2 ], me3 = me[ 3 ];

            const me4 = me[ 4 ], me5 = me[ 5 ], me6 = me[ 6 ], me7 = me[ 7 ];

            const me8 = me[ 8 ], me9 = me[ 9 ], me10 = me[ 10 ], me11 = me[ 11 ];

            const me12 = me[ 12 ], me13 = me[ 13 ], me14 = me[ 14 ], me15 = me[ 15 ];


            planes[ 0 ].setComponents( me3 - me0, me7 - me4, me11 - me8, me15 - me12 ).normalize();

            planes[ 1 ].setComponents( me3 + me0, me7 + me4, me11 + me8, me15 + me12 ).normalize();

            planes[ 2 ].setComponents( me3 + me1, me7 + me5, me11 + me9, me15 + me13 ).normalize();

            planes[ 3 ].setComponents( me3 - me1, me7 - me5, me11 - me9, me15 - me13 ).normalize();

            planes[ 4 ].setComponents( me3 - me2, me7 - me6, me11 - me10, me15 - me14 ).normalize();


            if ( coordinateSystem === WebGLCoordinateSystem ) {


                planes[ 5 ].setComponents( me3 + me2, me7 + me6, me11 + me10, me15 + me14 ).normalize();


            } else if ( coordinateSystem === WebGPUCoordinateSystem ) {


                planes[ 5 ].setComponents( me2, me6, me10, me14 ).normalize();


            } else {


                throw new Error( 'THREE.Frustum.setFromProjectionMatrix(): Invalid coordinate system: ' + coordinateSystem );


            }


            return this;


        }


        intersectsObject( object ) {


            if ( object.boundingSphere !== undefined ) {


                if ( object.boundingSphere === null ) object.computeBoundingSphere();


                _sphere$5.copy( object.boundingSphere ).applyMatrix4( object.matrixWorld );


            } else {


                const geometry = object.geometry;


                if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();


                _sphere$5.copy( geometry.boundingSphere ).applyMatrix4( object.matrixWorld );


            }


            return this.intersectsSphere( _sphere$5 );


        }


        intersectsSprite( sprite ) {


            _sphere$5.center.set( 0, 0, 0 );

            _sphere$5.radius = 0.7071067811865476;

            _sphere$5.applyMatrix4( sprite.matrixWorld );


            return this.intersectsSphere( _sphere$5 );


        }


        intersectsSphere( sphere ) {


            const planes = this.planes;

            const center = sphere.center;

            const negRadius = - sphere.radius;


            for ( let i = 0; i < 6; i ++ ) {


                const distance = planes[ i ].distanceToPoint( center );


                if ( distance < negRadius ) {


                    return false;


                }


            }


            return true;


        }


        intersectsBox( box ) {


            const planes = this.planes;


            for ( let i = 0; i < 6; i ++ ) {


                const plane = planes[ i ];


                // corner at max distance


                _vector$7.x = plane.normal.x > 0 ? box.max.x : box.min.x;

                _vector$7.y = plane.normal.y > 0 ? box.max.y : box.min.y;

                _vector$7.z = plane.normal.z > 0 ? box.max.z : box.min.z;


                if ( plane.distanceToPoint( _vector$7 ) < 0 ) {


                    return false;


                }


            }


            return true;


        }


        containsPoint( point ) {


            const planes = this.planes;


            for ( let i = 0; i < 6; i ++ ) {


                if ( planes[ i ].distanceToPoint( point ) < 0 ) {


                    return false;


                }


            }


            return true;


        }


        clone() {


            return new this.constructor().copy( this );


        }


    }


    function WebGLAnimation() {


        let context = null;

        let isAnimating = false;

        let animationLoop = null;

        let requestId = null;


        function onAnimationFrame( time, frame ) {


            animationLoop( time, frame );


            requestId = context.requestAnimationFrame( onAnimationFrame );


        }


        return {


            start: function () {


                if ( isAnimating === true ) return;

                if ( animationLoop === null ) return;


                requestId = context.requestAnimationFrame( onAnimationFrame );


                isAnimating = true;


            },


            stop: function () {


                context.cancelAnimationFrame( requestId );


                isAnimating = false;


            },


            setAnimationLoop: function ( callback ) {


                animationLoop = callback;


            },


            setContext: function ( value ) {


                context = value;


            }


        };


    }


    function WebGLAttributes( gl, capabilities ) {


        const isWebGL2 = capabilities.isWebGL2;


        const buffers = new WeakMap();


        function createBuffer( attribute, bufferType ) {


            const array = attribute.array;

            const usage = attribute.usage;

            const size = array.byteLength;


            const buffer = gl.createBuffer();


            gl.bindBuffer( bufferType, buffer );

            gl.bufferData( bufferType, array, usage );


            attribute.onUploadCallback();


            let type;


            if ( array instanceof Float32Array ) {


                type = gl.FLOAT;


            } else if ( array instanceof Uint16Array ) {


                if ( attribute.isFloat16BufferAttribute ) {


                    if ( isWebGL2 ) {


                        type = gl.HALF_FLOAT;


                    } else {


                        throw new Error( 'THREE.WebGLAttributes: Usage of Float16BufferAttribute requires WebGL2.' );


                    }


                } else {


                    type = gl.UNSIGNED_SHORT;


                }


            } else if ( array instanceof Int16Array ) {


                type = gl.SHORT;


            } else if ( array instanceof Uint32Array ) {


                type = gl.UNSIGNED_INT;


            } else if ( array instanceof Int32Array ) {


                type = gl.INT;


            } else if ( array instanceof Int8Array ) {


                type = gl.BYTE;


            } else if ( array instanceof Uint8Array ) {


                type = gl.UNSIGNED_BYTE;


            } else if ( array instanceof Uint8ClampedArray ) {


                type = gl.UNSIGNED_BYTE;


            } else {


                throw new Error( 'THREE.WebGLAttributes: Unsupported buffer data format: ' + array );


            }


            return {

                buffer: buffer,

                type: type,

                bytesPerElement: array.BYTES_PER_ELEMENT,

                version: attribute.version,

                size: size

            };


        }


        function updateBuffer( buffer, attribute, bufferType ) {


            const array = attribute.array;

            const updateRange = attribute._updateRange; // deprecated

            const updateRanges = attribute.updateRanges;


            gl.bindBuffer( bufferType, buffer );


            if ( updateRange.count === - 1 && updateRanges.length === 0 ) {


                // Not using update ranges

                gl.bufferSubData( bufferType, 0, array );


            }


            if ( updateRanges.length !== 0 ) {


                for ( let i = 0, l = updateRanges.length; i < l; i ++ ) {


                    const range = updateRanges[ i ];

                    if ( isWebGL2 ) {


                        gl.bufferSubData( bufferType, range.start * array.BYTES_PER_ELEMENT,

                            array, range.start, range.count );


                    } else {


                        gl.bufferSubData( bufferType, range.start * array.BYTES_PER_ELEMENT,

                            array.subarray( range.start, range.start + range.count ) );


                    }


                }


                attribute.clearUpdateRanges();


            }


            // deprecated

            if ( updateRange.count !== - 1 ) {


                if ( isWebGL2 ) {


                    gl.bufferSubData( bufferType, updateRange.offset * array.BYTES_PER_ELEMENT,

                        array, updateRange.offset, updateRange.count );


                } else {


                    gl.bufferSubData( bufferType, updateRange.offset * array.BYTES_PER_ELEMENT,

                        array.subarray( updateRange.offset, updateRange.offset + updateRange.count ) );


                }


                updateRange.count = - 1; // reset range


            }


            attribute.onUploadCallback();


        }


        //


        function get( attribute ) {


            if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;


            return buffers.get( attribute );


        }


        function remove( attribute ) {


            if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;


            const data = buffers.get( attribute );


            if ( data ) {


                gl.deleteBuffer( data.buffer );


                buffers.delete( attribute );


            }


        }


        function update( attribute, bufferType ) {


            if ( attribute.isGLBufferAttribute ) {


                const cached = buffers.get( attribute );


                if ( ! cached || cached.version < attribute.version ) {


                    buffers.set( attribute, {

                        buffer: attribute.buffer,

                        type: attribute.type,

                        bytesPerElement: attribute.elementSize,

                        version: attribute.version

                    } );


                }


                return;


            }


            if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;


            const data = buffers.get( attribute );


            if ( data === undefined ) {


                buffers.set( attribute, createBuffer( attribute, bufferType ) );


            } else if ( data.version < attribute.version ) {


                if ( data.size !== attribute.array.byteLength ) {


                    throw new Error( 'THREE.WebGLAttributes: The size of the buffer attribute\'s array buffer does not match the original size. Resizing buffer attributes is not supported.' );


                }


                updateBuffer( data.buffer, attribute, bufferType );


                data.version = attribute.version;


            }


        }


        return {


            get: get,

            remove: remove,

            update: update


        };


    }


    class PlaneGeometry extends BufferGeometry {


        constructor( width = 1, height = 1, widthSegments = 1, heightSegments = 1 ) {


            super();


            this.type = 'PlaneGeometry';


            this.parameters = {

                width: width,

                height: height,

                widthSegments: widthSegments,

                heightSegments: heightSegments

            };


            const width_half = width / 2;

            const height_half = height / 2;


            const gridX = Math.floor( widthSegments );

            const gridY = Math.floor( heightSegments );


            const gridX1 = gridX + 1;

            const gridY1 = gridY + 1;


            const segment_width = width / gridX;

            const segment_height = height / gridY;


            //


            const indices = [];

            const vertices = [];

            const normals = [];

            const uvs = [];


            for ( let iy = 0; iy < gridY1; iy ++ ) {


                const y = iy * segment_height - height_half;


                for ( let ix = 0; ix < gridX1; ix ++ ) {


                    const x = ix * segment_width - width_half;


                    vertices.push( x, - y, 0 );


                    normals.push( 0, 0, 1 );


                    uvs.push( ix / gridX );

                    uvs.push( 1 - ( iy / gridY ) );


                }


            }


            for ( let iy = 0; iy < gridY; iy ++ ) {


                for ( let ix = 0; ix < gridX; ix ++ ) {


                    const a = ix + gridX1 * iy;

                    const b = ix + gridX1 * ( iy + 1 );

                    const c = ( ix + 1 ) + gridX1 * ( iy + 1 );

                    const d = ( ix + 1 ) + gridX1 * iy;


                    indices.push( a, b, d );

                    indices.push( b, c, d );


                }


            }


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        static fromJSON( data ) {


            return new PlaneGeometry( data.width, data.height, data.widthSegments, data.heightSegments );


        }


    }


    var alphahash_fragment = "#ifdef USE_ALPHAHASH\n\tif ( diffuseColor.a < getAlphaHashThreshold( vPosition ) ) discard;\n#endif";


    var alphahash_pars_fragment = "#ifdef USE_ALPHAHASH\n\tconst float ALPHA_HASH_SCALE = 0.05;\n\tfloat hash2D( vec2 value ) {\n\t\treturn fract( 1.0e4 * sin( 17.0 * value.x + 0.1 * value.y ) * ( 0.1 + abs( sin( 13.0 * value.y + value.x ) ) ) );\n\t}\n\tfloat hash3D( vec3 value ) {\n\t\treturn hash2D( vec2( hash2D( value.xy ), value.z ) );\n\t}\n\tfloat getAlphaHashThreshold( vec3 position ) {\n\t\tfloat maxDeriv = max(\n\t\t\tlength( dFdx( position.xyz ) ),\n\t\t\tlength( dFdy( position.xyz ) )\n\t\t);\n\t\tfloat pixScale = 1.0 / ( ALPHA_HASH_SCALE * maxDeriv );\n\t\tvec2 pixScales = vec2(\n\t\t\texp2( floor( log2( pixScale ) ) ),\n\t\t\texp2( ceil( log2( pixScale ) ) )\n\t\t);\n\t\tvec2 alpha = vec2(\n\t\t\thash3D( floor( pixScales.x * position.xyz ) ),\n\t\t\thash3D( floor( pixScales.y * position.xyz ) )\n\t\t);\n\t\tfloat lerpFactor = fract( log2( pixScale ) );\n\t\tfloat x = ( 1.0 - lerpFactor ) * alpha.x + lerpFactor * alpha.y;\n\t\tfloat a = min( lerpFactor, 1.0 - lerpFactor );\n\t\tvec3 cases = vec3(\n\t\t\tx * x / ( 2.0 * a * ( 1.0 - a ) ),\n\t\t\t( x - 0.5 * a ) / ( 1.0 - a ),\n\t\t\t1.0 - ( ( 1.0 - x ) * ( 1.0 - x ) / ( 2.0 * a * ( 1.0 - a ) ) )\n\t\t);\n\t\tfloat threshold = ( x < ( 1.0 - a ) )\n\t\t\t? ( ( x < a ) ? cases.x : cases.y )\n\t\t\t: cases.z;\n\t\treturn clamp( threshold , 1.0e-6, 1.0 );\n\t}\n#endif";


    var alphamap_fragment = "#ifdef USE_ALPHAMAP\n\tdiffuseColor.a *= texture2D( alphaMap, vAlphaMapUv ).g;\n#endif";


    var alphamap_pars_fragment = "#ifdef USE_ALPHAMAP\n\tuniform sampler2D alphaMap;\n#endif";


    var alphatest_fragment = "#ifdef USE_ALPHATEST\n\tif ( diffuseColor.a < alphaTest ) discard;\n#endif";


    var alphatest_pars_fragment = "#ifdef USE_ALPHATEST\n\tuniform float alphaTest;\n#endif";


    var aomap_fragment = "#ifdef USE_AOMAP\n\tfloat ambientOcclusion = ( texture2D( aoMap, vAoMapUv ).r - 1.0 ) * aoMapIntensity + 1.0;\n\treflectedLight.indirectDiffuse *= ambientOcclusion;\n\t#if defined( USE_CLEARCOAT ) \n\t\tclearcoatSpecularIndirect *= ambientOcclusion;\n\t#endif\n\t#if defined( USE_SHEEN ) \n\t\tsheenSpecularIndirect *= ambientOcclusion;\n\t#endif\n\t#if defined( USE_ENVMAP ) && defined( STANDARD )\n\t\tfloat dotNV = saturate( dot( geometryNormal, geometryViewDir ) );\n\t\treflectedLight.indirectSpecular *= computeSpecularOcclusion( dotNV, ambientOcclusion, material.roughness );\n\t#endif\n#endif";


    var aomap_pars_fragment = "#ifdef USE_AOMAP\n\tuniform sampler2D aoMap;\n\tuniform float aoMapIntensity;\n#endif";


    var batching_pars_vertex = "#ifdef USE_BATCHING\n\tattribute float batchId;\n\tuniform highp sampler2D batchingTexture;\n\tmat4 getBatchingMatrix( const in float i ) {\n\t\tint size = textureSize( batchingTexture, 0 ).x;\n\t\tint j = int( i ) * 4;\n\t\tint x = j % size;\n\t\tint y = j / size;\n\t\tvec4 v1 = texelFetch( batchingTexture, ivec2( x, y ), 0 );\n\t\tvec4 v2 = texelFetch( batchingTexture, ivec2( x + 1, y ), 0 );\n\t\tvec4 v3 = texelFetch( batchingTexture, ivec2( x + 2, y ), 0 );\n\t\tvec4 v4 = texelFetch( batchingTexture, ivec2( x + 3, y ), 0 );\n\t\treturn mat4( v1, v2, v3, v4 );\n\t}\n#endif";


    var batching_vertex = "#ifdef USE_BATCHING\n\tmat4 batchingMatrix = getBatchingMatrix( batchId );\n#endif";


    var begin_vertex = "vec3 transformed = vec3( position );\n#ifdef USE_ALPHAHASH\n\tvPosition = vec3( position );\n#endif";


    var beginnormal_vertex = "vec3 objectNormal = vec3( normal );\n#ifdef USE_TANGENT\n\tvec3 objectTangent = vec3( tangent.xyz );\n#endif";


    var bsdfs = "float G_BlinnPhong_Implicit( ) {\n\treturn 0.25;\n}\nfloat D_BlinnPhong( const in float shininess, const in float dotNH ) {\n\treturn RECIPROCAL_PI * ( shininess * 0.5 + 1.0 ) * pow( dotNH, shininess );\n}\nvec3 BRDF_BlinnPhong( const in vec3 lightDir, const in vec3 viewDir, const in vec3 normal, const in vec3 specularColor, const in float shininess ) {\n\tvec3 halfDir = normalize( lightDir + viewDir );\n\tfloat dotNH = saturate( dot( normal, halfDir ) );\n\tfloat dotVH = saturate( dot( viewDir, halfDir ) );\n\tvec3 F = F_Schlick( specularColor, 1.0, dotVH );\n\tfloat G = G_BlinnPhong_Implicit( );\n\tfloat D = D_BlinnPhong( shininess, dotNH );\n\treturn F * ( G * D );\n} // validated";


    var iridescence_fragment = "#ifdef USE_IRIDESCENCE\n\tconst mat3 XYZ_TO_REC709 = mat3(\n\t\t 3.2404542, -0.9692660,  0.0556434,\n\t\t-1.5371385,  1.8760108, -0.2040259,\n\t\t-0.4985314,  0.0415560,  1.0572252\n\t);\n\tvec3 Fresnel0ToIor( vec3 fresnel0 ) {\n\t\tvec3 sqrtF0 = sqrt( fresnel0 );\n\t\treturn ( vec3( 1.0 ) + sqrtF0 ) / ( vec3( 1.0 ) - sqrtF0 );\n\t}\n\tvec3 IorToFresnel0( vec3 transmittedIor, float incidentIor ) {\n\t\treturn pow2( ( transmittedIor - vec3( incidentIor ) ) / ( transmittedIor + vec3( incidentIor ) ) );\n\t}\n\tfloat IorToFresnel0( float transmittedIor, float incidentIor ) {\n\t\treturn pow2( ( transmittedIor - incidentIor ) / ( transmittedIor + incidentIor ));\n\t}\n\tvec3 evalSensitivity( float OPD, vec3 shift ) {\n\t\tfloat phase = 2.0 * PI * OPD * 1.0e-9;\n\t\tvec3 val = vec3( 5.4856e-13, 4.4201e-13, 5.2481e-13 );\n\t\tvec3 pos = vec3( 1.6810e+06, 1.7953e+06, 2.2084e+06 );\n\t\tvec3 var = vec3( 4.3278e+09, 9.3046e+09, 6.6121e+09 );\n\t\tvec3 xyz = val * sqrt( 2.0 * PI * var ) * cos( pos * phase + shift ) * exp( - pow2( phase ) * var );\n\t\txyz.x += 9.7470e-14 * sqrt( 2.0 * PI * 4.5282e+09 ) * cos( 2.2399e+06 * phase + shift[ 0 ] ) * exp( - 4.5282e+09 * pow2( phase ) );\n\t\txyz /= 1.0685e-7;\n\t\tvec3 rgb = XYZ_TO_REC709 * xyz;\n\t\treturn rgb;\n\t}\n\tvec3 evalIridescence( float outsideIOR, float eta2, float cosTheta1, float thinFilmThickness, vec3 baseF0 ) {\n\t\tvec3 I;\n\t\tfloat iridescenceIOR = mix( outsideIOR, eta2, smoothstep( 0.0, 0.03, thinFilmThickness ) );\n\t\tfloat sinTheta2Sq = pow2( outsideIOR / iridescenceIOR ) * ( 1.0 - pow2( cosTheta1 ) );\n\t\tfloat cosTheta2Sq = 1.0 - sinTheta2Sq;\n\t\tif ( cosTheta2Sq < 0.0 ) {\n\t\t\treturn vec3( 1.0 );\n\t\t}\n\t\tfloat cosTheta2 = sqrt( cosTheta2Sq );\n\t\tfloat R0 = IorToFresnel0( iridescenceIOR, outsideIOR );\n\t\tfloat R12 = F_Schlick( R0, 1.0, cosTheta1 );\n\t\tfloat T121 = 1.0 - R12;\n\t\tfloat phi12 = 0.0;\n\t\tif ( iridescenceIOR < outsideIOR ) phi12 = PI;\n\t\tfloat phi21 = PI - phi12;\n\t\tvec3 baseIOR = Fresnel0ToIor( clamp( baseF0, 0.0, 0.9999 ) );\t\tvec3 R1 = IorToFresnel0( baseIOR, iridescenceIOR );\n\t\tvec3 R23 = F_Schlick( R1, 1.0, cosTheta2 );\n\t\tvec3 phi23 = vec3( 0.0 );\n\t\tif ( baseIOR[ 0 ] < iridescenceIOR ) phi23[ 0 ] = PI;\n\t\tif ( baseIOR[ 1 ] < iridescenceIOR ) phi23[ 1 ] = PI;\n\t\tif ( baseIOR[ 2 ] < iridescenceIOR ) phi23[ 2 ] = PI;\n\t\tfloat OPD = 2.0 * iridescenceIOR * thinFilmThickness * cosTheta2;\n\t\tvec3 phi = vec3( phi21 ) + phi23;\n\t\tvec3 R123 = clamp( R12 * R23, 1e-5, 0.9999 );\n\t\tvec3 r123 = sqrt( R123 );\n\t\tvec3 Rs = pow2( T121 ) * R23 / ( vec3( 1.0 ) - R123 );\n\t\tvec3 C0 = R12 + Rs;\n\t\tI = C0;\n\t\tvec3 Cm = Rs - T121;\n\t\tfor ( int m = 1; m <= 2; ++ m ) {\n\t\t\tCm *= r123;\n\t\t\tvec3 Sm = 2.0 * evalSensitivity( float( m ) * OPD, float( m ) * phi );\n\t\t\tI += Cm * Sm;\n\t\t}\n\t\treturn max( I, vec3( 0.0 ) );\n\t}\n#endif";


    var bumpmap_pars_fragment = "#ifdef USE_BUMPMAP\n\tuniform sampler2D bumpMap;\n\tuniform float bumpScale;\n\tvec2 dHdxy_fwd() {\n\t\tvec2 dSTdx = dFdx( vBumpMapUv );\n\t\tvec2 dSTdy = dFdy( vBumpMapUv );\n\t\tfloat Hll = bumpScale * texture2D( bumpMap, vBumpMapUv ).x;\n\t\tfloat dBx = bumpScale * texture2D( bumpMap, vBumpMapUv + dSTdx ).x - Hll;\n\t\tfloat dBy = bumpScale * texture2D( bumpMap, vBumpMapUv + dSTdy ).x - Hll;\n\t\treturn vec2( dBx, dBy );\n\t}\n\tvec3 perturbNormalArb( vec3 surf_pos, vec3 surf_norm, vec2 dHdxy, float faceDirection ) {\n\t\tvec3 vSigmaX = normalize( dFdx( surf_pos.xyz ) );\n\t\tvec3 vSigmaY = normalize( dFdy( surf_pos.xyz ) );\n\t\tvec3 vN = surf_norm;\n\t\tvec3 R1 = cross( vSigmaY, vN );\n\t\tvec3 R2 = cross( vN, vSigmaX );\n\t\tfloat fDet = dot( vSigmaX, R1 ) * faceDirection;\n\t\tvec3 vGrad = sign( fDet ) * ( dHdxy.x * R1 + dHdxy.y * R2 );\n\t\treturn normalize( abs( fDet ) * surf_norm - vGrad );\n\t}\n#endif";


    var clipping_planes_fragment = "#if NUM_CLIPPING_PLANES > 0\n\tvec4 plane;\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < UNION_CLIPPING_PLANES; i ++ ) {\n\t\tplane = clippingPlanes[ i ];\n\t\tif ( dot( vClipPosition, plane.xyz ) > plane.w ) discard;\n\t}\n\t#pragma unroll_loop_end\n\t#if UNION_CLIPPING_PLANES < NUM_CLIPPING_PLANES\n\t\tbool clipped = true;\n\t\t#pragma unroll_loop_start\n\t\tfor ( int i = UNION_CLIPPING_PLANES; i < NUM_CLIPPING_PLANES; i ++ ) {\n\t\t\tplane = clippingPlanes[ i ];\n\t\t\tclipped = ( dot( vClipPosition, plane.xyz ) > plane.w ) && clipped;\n\t\t}\n\t\t#pragma unroll_loop_end\n\t\tif ( clipped ) discard;\n\t#endif\n#endif";


    var clipping_planes_pars_fragment = "#if NUM_CLIPPING_PLANES > 0\n\tvarying vec3 vClipPosition;\n\tuniform vec4 clippingPlanes[ NUM_CLIPPING_PLANES ];\n#endif";


    var clipping_planes_pars_vertex = "#if NUM_CLIPPING_PLANES > 0\n\tvarying vec3 vClipPosition;\n#endif";


    var clipping_planes_vertex = "#if NUM_CLIPPING_PLANES > 0\n\tvClipPosition = - mvPosition.xyz;\n#endif";


    var color_fragment = "#if defined( USE_COLOR_ALPHA )\n\tdiffuseColor *= vColor;\n#elif defined( USE_COLOR )\n\tdiffuseColor.rgb *= vColor;\n#endif";


    var color_pars_fragment = "#if defined( USE_COLOR_ALPHA )\n\tvarying vec4 vColor;\n#elif defined( USE_COLOR )\n\tvarying vec3 vColor;\n#endif";


    var color_pars_vertex = "#if defined( USE_COLOR_ALPHA )\n\tvarying vec4 vColor;\n#elif defined( USE_COLOR ) || defined( USE_INSTANCING_COLOR )\n\tvarying vec3 vColor;\n#endif";


    var color_vertex = "#if defined( USE_COLOR_ALPHA )\n\tvColor = vec4( 1.0 );\n#elif defined( USE_COLOR ) || defined( USE_INSTANCING_COLOR )\n\tvColor = vec3( 1.0 );\n#endif\n#ifdef USE_COLOR\n\tvColor *= color;\n#endif\n#ifdef USE_INSTANCING_COLOR\n\tvColor.xyz *= instanceColor.xyz;\n#endif";


    var common = "#define PI 3.141592653589793\n#define PI2 6.283185307179586\n#define PI_HALF 1.5707963267948966\n#define RECIPROCAL_PI 0.3183098861837907\n#define RECIPROCAL_PI2 0.15915494309189535\n#define EPSILON 1e-6\n#ifndef saturate\n#define saturate( a ) clamp( a, 0.0, 1.0 )\n#endif\n#define whiteComplement( a ) ( 1.0 - saturate( a ) )\nfloat pow2( const in float x ) { return x*x; }\nvec3 pow2( const in vec3 x ) { return x*x; }\nfloat pow3( const in float x ) { return x*x*x; }\nfloat pow4( const in float x ) { float x2 = x*x; return x2*x2; }\nfloat max3( const in vec3 v ) { return max( max( v.x, v.y ), v.z ); }\nfloat average( const in vec3 v ) { return dot( v, vec3( 0.3333333 ) ); }\nhighp float rand( const in vec2 uv ) {\n\tconst highp float a = 12.9898, b = 78.233, c = 43758.5453;\n\thighp float dt = dot( uv.xy, vec2( a,b ) ), sn = mod( dt, PI );\n\treturn fract( sin( sn ) * c );\n}\n#ifdef HIGH_PRECISION\n\tfloat precisionSafeLength( vec3 v ) { return length( v ); }\n#else\n\tfloat precisionSafeLength( vec3 v ) {\n\t\tfloat maxComponent = max3( abs( v ) );\n\t\treturn length( v / maxComponent ) * maxComponent;\n\t}\n#endif\nstruct IncidentLight {\n\tvec3 color;\n\tvec3 direction;\n\tbool visible;\n};\nstruct ReflectedLight {\n\tvec3 directDiffuse;\n\tvec3 directSpecular;\n\tvec3 indirectDiffuse;\n\tvec3 indirectSpecular;\n};\n#ifdef USE_ALPHAHASH\n\tvarying vec3 vPosition;\n#endif\nvec3 transformDirection( in vec3 dir, in mat4 matrix ) {\n\treturn normalize( ( matrix * vec4( dir, 0.0 ) ).xyz );\n}\nvec3 inverseTransformDirection( in vec3 dir, in mat4 matrix ) {\n\treturn normalize( ( vec4( dir, 0.0 ) * matrix ).xyz );\n}\nmat3 transposeMat3( const in mat3 m ) {\n\tmat3 tmp;\n\ttmp[ 0 ] = vec3( m[ 0 ].x, m[ 1 ].x, m[ 2 ].x );\n\ttmp[ 1 ] = vec3( m[ 0 ].y, m[ 1 ].y, m[ 2 ].y );\n\ttmp[ 2 ] = vec3( m[ 0 ].z, m[ 1 ].z, m[ 2 ].z );\n\treturn tmp;\n}\nfloat luminance( const in vec3 rgb ) {\n\tconst vec3 weights = vec3( 0.2126729, 0.7151522, 0.0721750 );\n\treturn dot( weights, rgb );\n}\nbool isPerspectiveMatrix( mat4 m ) {\n\treturn m[ 2 ][ 3 ] == - 1.0;\n}\nvec2 equirectUv( in vec3 dir ) {\n\tfloat u = atan( dir.z, dir.x ) * RECIPROCAL_PI2 + 0.5;\n\tfloat v = asin( clamp( dir.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;\n\treturn vec2( u, v );\n}\nvec3 BRDF_Lambert( const in vec3 diffuseColor ) {\n\treturn RECIPROCAL_PI * diffuseColor;\n}\nvec3 F_Schlick( const in vec3 f0, const in float f90, const in float dotVH ) {\n\tfloat fresnel = exp2( ( - 5.55473 * dotVH - 6.98316 ) * dotVH );\n\treturn f0 * ( 1.0 - fresnel ) + ( f90 * fresnel );\n}\nfloat F_Schlick( const in float f0, const in float f90, const in float dotVH ) {\n\tfloat fresnel = exp2( ( - 5.55473 * dotVH - 6.98316 ) * dotVH );\n\treturn f0 * ( 1.0 - fresnel ) + ( f90 * fresnel );\n} // validated";


    var cube_uv_reflection_fragment = "#ifdef ENVMAP_TYPE_CUBE_UV\n\t#define cubeUV_minMipLevel 4.0\n\t#define cubeUV_minTileSize 16.0\n\tfloat getFace( vec3 direction ) {\n\t\tvec3 absDirection = abs( direction );\n\t\tfloat face = - 1.0;\n\t\tif ( absDirection.x > absDirection.z ) {\n\t\t\tif ( absDirection.x > absDirection.y )\n\t\t\t\tface = direction.x > 0.0 ? 0.0 : 3.0;\n\t\t\telse\n\t\t\t\tface = direction.y > 0.0 ? 1.0 : 4.0;\n\t\t} else {\n\t\t\tif ( absDirection.z > absDirection.y )\n\t\t\t\tface = direction.z > 0.0 ? 2.0 : 5.0;\n\t\t\telse\n\t\t\t\tface = direction.y > 0.0 ? 1.0 : 4.0;\n\t\t}\n\t\treturn face;\n\t}\n\tvec2 getUV( vec3 direction, float face ) {\n\t\tvec2 uv;\n\t\tif ( face == 0.0 ) {\n\t\t\tuv = vec2( direction.z, direction.y ) / abs( direction.x );\n\t\t} else if ( face == 1.0 ) {\n\t\t\tuv = vec2( - direction.x, - direction.z ) / abs( direction.y );\n\t\t} else if ( face == 2.0 ) {\n\t\t\tuv = vec2( - direction.x, direction.y ) / abs( direction.z );\n\t\t} else if ( face == 3.0 ) {\n\t\t\tuv = vec2( - direction.z, direction.y ) / abs( direction.x );\n\t\t} else if ( face == 4.0 ) {\n\t\t\tuv = vec2( - direction.x, direction.z ) / abs( direction.y );\n\t\t} else {\n\t\t\tuv = vec2( direction.x, direction.y ) / abs( direction.z );\n\t\t}\n\t\treturn 0.5 * ( uv + 1.0 );\n\t}\n\tvec3 bilinearCubeUV( sampler2D envMap, vec3 direction, float mipInt ) {\n\t\tfloat face = getFace( direction );\n\t\tfloat filterInt = max( cubeUV_minMipLevel - mipInt, 0.0 );\n\t\tmipInt = max( mipInt, cubeUV_minMipLevel );\n\t\tfloat faceSize = exp2( mipInt );\n\t\thighp vec2 uv = getUV( direction, face ) * ( faceSize - 2.0 ) + 1.0;\n\t\tif ( face > 2.0 ) {\n\t\t\tuv.y += faceSize;\n\t\t\tface -= 3.0;\n\t\t}\n\t\tuv.x += face * faceSize;\n\t\tuv.x += filterInt * 3.0 * cubeUV_minTileSize;\n\t\tuv.y += 4.0 * ( exp2( CUBEUV_MAX_MIP ) - faceSize );\n\t\tuv.x *= CUBEUV_TEXEL_WIDTH;\n\t\tuv.y *= CUBEUV_TEXEL_HEIGHT;\n\t\t#ifdef texture2DGradEXT\n\t\t\treturn texture2DGradEXT( envMap, uv, vec2( 0.0 ), vec2( 0.0 ) ).rgb;\n\t\t#else\n\t\t\treturn texture2D( envMap, uv ).rgb;\n\t\t#endif\n\t}\n\t#define cubeUV_r0 1.0\n\t#define cubeUV_m0 - 2.0\n\t#define cubeUV_r1 0.8\n\t#define cubeUV_m1 - 1.0\n\t#define cubeUV_r4 0.4\n\t#define cubeUV_m4 2.0\n\t#define cubeUV_r5 0.305\n\t#define cubeUV_m5 3.0\n\t#define cubeUV_r6 0.21\n\t#define cubeUV_m6 4.0\n\tfloat roughnessToMip( float roughness ) {\n\t\tfloat mip = 0.0;\n\t\tif ( roughness >= cubeUV_r1 ) {\n\t\t\tmip = ( cubeUV_r0 - roughness ) * ( cubeUV_m1 - cubeUV_m0 ) / ( cubeUV_r0 - cubeUV_r1 ) + cubeUV_m0;\n\t\t} else if ( roughness >= cubeUV_r4 ) {\n\t\t\tmip = ( cubeUV_r1 - roughness ) * ( cubeUV_m4 - cubeUV_m1 ) / ( cubeUV_r1 - cubeUV_r4 ) + cubeUV_m1;\n\t\t} else if ( roughness >= cubeUV_r5 ) {\n\t\t\tmip = ( cubeUV_r4 - roughness ) * ( cubeUV_m5 - cubeUV_m4 ) / ( cubeUV_r4 - cubeUV_r5 ) + cubeUV_m4;\n\t\t} else if ( roughness >= cubeUV_r6 ) {\n\t\t\tmip = ( cubeUV_r5 - roughness ) * ( cubeUV_m6 - cubeUV_m5 ) / ( cubeUV_r5 - cubeUV_r6 ) + cubeUV_m5;\n\t\t} else {\n\t\t\tmip = - 2.0 * log2( 1.16 * roughness );\t\t}\n\t\treturn mip;\n\t}\n\tvec4 textureCubeUV( sampler2D envMap, vec3 sampleDir, float roughness ) {\n\t\tfloat mip = clamp( roughnessToMip( roughness ), cubeUV_m0, CUBEUV_MAX_MIP );\n\t\tfloat mipF = fract( mip );\n\t\tfloat mipInt = floor( mip );\n\t\tvec3 color0 = bilinearCubeUV( envMap, sampleDir, mipInt );\n\t\tif ( mipF == 0.0 ) {\n\t\t\treturn vec4( color0, 1.0 );\n\t\t} else {\n\t\t\tvec3 color1 = bilinearCubeUV( envMap, sampleDir, mipInt + 1.0 );\n\t\t\treturn vec4( mix( color0, color1, mipF ), 1.0 );\n\t\t}\n\t}\n#endif";


    var defaultnormal_vertex = "vec3 transformedNormal = objectNormal;\n#ifdef USE_TANGENT\n\tvec3 transformedTangent = objectTangent;\n#endif\n#ifdef USE_BATCHING\n\tmat3 bm = mat3( batchingMatrix );\n\ttransformedNormal /= vec3( dot( bm[ 0 ], bm[ 0 ] ), dot( bm[ 1 ], bm[ 1 ] ), dot( bm[ 2 ], bm[ 2 ] ) );\n\ttransformedNormal = bm * transformedNormal;\n\t#ifdef USE_TANGENT\n\t\ttransformedTangent = bm * transformedTangent;\n\t#endif\n#endif\n#ifdef USE_INSTANCING\n\tmat3 im = mat3( instanceMatrix );\n\ttransformedNormal /= vec3( dot( im[ 0 ], im[ 0 ] ), dot( im[ 1 ], im[ 1 ] ), dot( im[ 2 ], im[ 2 ] ) );\n\ttransformedNormal = im * transformedNormal;\n\t#ifdef USE_TANGENT\n\t\ttransformedTangent = im * transformedTangent;\n\t#endif\n#endif\ntransformedNormal = normalMatrix * transformedNormal;\n#ifdef FLIP_SIDED\n\ttransformedNormal = - transformedNormal;\n#endif\n#ifdef USE_TANGENT\n\ttransformedTangent = ( modelViewMatrix * vec4( transformedTangent, 0.0 ) ).xyz;\n\t#ifdef FLIP_SIDED\n\t\ttransformedTangent = - transformedTangent;\n\t#endif\n#endif";


    var displacementmap_pars_vertex = "#ifdef USE_DISPLACEMENTMAP\n\tuniform sampler2D displacementMap;\n\tuniform float displacementScale;\n\tuniform float displacementBias;\n#endif";


    var displacementmap_vertex = "#ifdef USE_DISPLACEMENTMAP\n\ttransformed += normalize( objectNormal ) * ( texture2D( displacementMap, vDisplacementMapUv ).x * displacementScale + displacementBias );\n#endif";


    var emissivemap_fragment = "#ifdef USE_EMISSIVEMAP\n\tvec4 emissiveColor = texture2D( emissiveMap, vEmissiveMapUv );\n\ttotalEmissiveRadiance *= emissiveColor.rgb;\n#endif";


    var emissivemap_pars_fragment = "#ifdef USE_EMISSIVEMAP\n\tuniform sampler2D emissiveMap;\n#endif";


    var colorspace_fragment = "gl_FragColor = linearToOutputTexel( gl_FragColor );";


    var colorspace_pars_fragment = "\nconst mat3 LINEAR_SRGB_TO_LINEAR_DISPLAY_P3 = mat3(\n\tvec3( 0.8224621, 0.177538, 0.0 ),\n\tvec3( 0.0331941, 0.9668058, 0.0 ),\n\tvec3( 0.0170827, 0.0723974, 0.9105199 )\n);\nconst mat3 LINEAR_DISPLAY_P3_TO_LINEAR_SRGB = mat3(\n\tvec3( 1.2249401, - 0.2249404, 0.0 ),\n\tvec3( - 0.0420569, 1.0420571, 0.0 ),\n\tvec3( - 0.0196376, - 0.0786361, 1.0982735 )\n);\nvec4 LinearSRGBToLinearDisplayP3( in vec4 value ) {\n\treturn vec4( value.rgb * LINEAR_SRGB_TO_LINEAR_DISPLAY_P3, value.a );\n}\nvec4 LinearDisplayP3ToLinearSRGB( in vec4 value ) {\n\treturn vec4( value.rgb * LINEAR_DISPLAY_P3_TO_LINEAR_SRGB, value.a );\n}\nvec4 LinearTransferOETF( in vec4 value ) {\n\treturn value;\n}\nvec4 sRGBTransferOETF( in vec4 value ) {\n\treturn vec4( mix( pow( value.rgb, vec3( 0.41666 ) ) * 1.055 - vec3( 0.055 ), value.rgb * 12.92, vec3( lessThanEqual( value.rgb, vec3( 0.0031308 ) ) ) ), value.a );\n}\nvec4 LinearToLinear( in vec4 value ) {\n\treturn value;\n}\nvec4 LinearTosRGB( in vec4 value ) {\n\treturn sRGBTransferOETF( value );\n}";


    var envmap_fragment = "#ifdef USE_ENVMAP\n\t#ifdef ENV_WORLDPOS\n\t\tvec3 cameraToFrag;\n\t\tif ( isOrthographic ) {\n\t\t\tcameraToFrag = normalize( vec3( - viewMatrix[ 0 ][ 2 ], - viewMatrix[ 1 ][ 2 ], - viewMatrix[ 2 ][ 2 ] ) );\n\t\t} else {\n\t\t\tcameraToFrag = normalize( vWorldPosition - cameraPosition );\n\t\t}\n\t\tvec3 worldNormal = inverseTransformDirection( normal, viewMatrix );\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t\tvec3 reflectVec = reflect( cameraToFrag, worldNormal );\n\t\t#else\n\t\t\tvec3 reflectVec = refract( cameraToFrag, worldNormal, refractionRatio );\n\t\t#endif\n\t#else\n\t\tvec3 reflectVec = vReflect;\n\t#endif\n\t#ifdef ENVMAP_TYPE_CUBE\n\t\tvec4 envColor = textureCube( envMap, vec3( flipEnvMap * reflectVec.x, reflectVec.yz ) );\n\t#else\n\t\tvec4 envColor = vec4( 0.0 );\n\t#endif\n\t#ifdef ENVMAP_BLENDING_MULTIPLY\n\t\toutgoingLight = mix( outgoingLight, outgoingLight * envColor.xyz, specularStrength * reflectivity );\n\t#elif defined( ENVMAP_BLENDING_MIX )\n\t\toutgoingLight = mix( outgoingLight, envColor.xyz, specularStrength * reflectivity );\n\t#elif defined( ENVMAP_BLENDING_ADD )\n\t\toutgoingLight += envColor.xyz * specularStrength * reflectivity;\n\t#endif\n#endif";


    var envmap_common_pars_fragment = "#ifdef USE_ENVMAP\n\tuniform float envMapIntensity;\n\tuniform float flipEnvMap;\n\t#ifdef ENVMAP_TYPE_CUBE\n\t\tuniform samplerCube envMap;\n\t#else\n\t\tuniform sampler2D envMap;\n\t#endif\n\t\n#endif";


    var envmap_pars_fragment = "#ifdef USE_ENVMAP\n\tuniform float reflectivity;\n\t#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG ) || defined( LAMBERT )\n\t\t#define ENV_WORLDPOS\n\t#endif\n\t#ifdef ENV_WORLDPOS\n\t\tvarying vec3 vWorldPosition;\n\t\tuniform float refractionRatio;\n\t#else\n\t\tvarying vec3 vReflect;\n\t#endif\n#endif";


    var envmap_pars_vertex = "#ifdef USE_ENVMAP\n\t#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG ) || defined( LAMBERT )\n\t\t#define ENV_WORLDPOS\n\t#endif\n\t#ifdef ENV_WORLDPOS\n\t\t\n\t\tvarying vec3 vWorldPosition;\n\t#else\n\t\tvarying vec3 vReflect;\n\t\tuniform float refractionRatio;\n\t#endif\n#endif";


    var envmap_vertex = "#ifdef USE_ENVMAP\n\t#ifdef ENV_WORLDPOS\n\t\tvWorldPosition = worldPosition.xyz;\n\t#else\n\t\tvec3 cameraToVertex;\n\t\tif ( isOrthographic ) {\n\t\t\tcameraToVertex = normalize( vec3( - viewMatrix[ 0 ][ 2 ], - viewMatrix[ 1 ][ 2 ], - viewMatrix[ 2 ][ 2 ] ) );\n\t\t} else {\n\t\t\tcameraToVertex = normalize( worldPosition.xyz - cameraPosition );\n\t\t}\n\t\tvec3 worldNormal = inverseTransformDirection( transformedNormal, viewMatrix );\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t\tvReflect = reflect( cameraToVertex, worldNormal );\n\t\t#else\n\t\t\tvReflect = refract( cameraToVertex, worldNormal, refractionRatio );\n\t\t#endif\n\t#endif\n#endif";


    var fog_vertex = "#ifdef USE_FOG\n\tvFogDepth = - mvPosition.z;\n#endif";


    var fog_pars_vertex = "#ifdef USE_FOG\n\tvarying float vFogDepth;\n#endif";


    var fog_fragment = "#ifdef USE_FOG\n\t#ifdef FOG_EXP2\n\t\tfloat fogFactor = 1.0 - exp( - fogDensity * fogDensity * vFogDepth * vFogDepth );\n\t#else\n\t\tfloat fogFactor = smoothstep( fogNear, fogFar, vFogDepth );\n\t#endif\n\tgl_FragColor.rgb = mix( gl_FragColor.rgb, fogColor, fogFactor );\n#endif";


    var fog_pars_fragment = "#ifdef USE_FOG\n\tuniform vec3 fogColor;\n\tvarying float vFogDepth;\n\t#ifdef FOG_EXP2\n\t\tuniform float fogDensity;\n\t#else\n\t\tuniform float fogNear;\n\t\tuniform float fogFar;\n\t#endif\n#endif";


    var gradientmap_pars_fragment = "#ifdef USE_GRADIENTMAP\n\tuniform sampler2D gradientMap;\n#endif\nvec3 getGradientIrradiance( vec3 normal, vec3 lightDirection ) {\n\tfloat dotNL = dot( normal, lightDirection );\n\tvec2 coord = vec2( dotNL * 0.5 + 0.5, 0.0 );\n\t#ifdef USE_GRADIENTMAP\n\t\treturn vec3( texture2D( gradientMap, coord ).r );\n\t#else\n\t\tvec2 fw = fwidth( coord ) * 0.5;\n\t\treturn mix( vec3( 0.7 ), vec3( 1.0 ), smoothstep( 0.7 - fw.x, 0.7 + fw.x, coord.x ) );\n\t#endif\n}";


    var lightmap_fragment = "#ifdef USE_LIGHTMAP\n\tvec4 lightMapTexel = texture2D( lightMap, vLightMapUv );\n\tvec3 lightMapIrradiance = lightMapTexel.rgb * lightMapIntensity;\n\treflectedLight.indirectDiffuse += lightMapIrradiance;\n#endif";


    var lightmap_pars_fragment = "#ifdef USE_LIGHTMAP\n\tuniform sampler2D lightMap;\n\tuniform float lightMapIntensity;\n#endif";


    var lights_lambert_fragment = "LambertMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb;\nmaterial.specularStrength = specularStrength;";


    var lights_lambert_pars_fragment = "varying vec3 vViewPosition;\nstruct LambertMaterial {\n\tvec3 diffuseColor;\n\tfloat specularStrength;\n};\nvoid RE_Direct_Lambert( const in IncidentLight directLight, const in vec3 geometryPosition, const in vec3 geometryNormal, const in vec3 geometryViewDir, const in vec3 geometryClearcoatNormal, const in LambertMaterial material, inout ReflectedLight reflectedLight ) {\n\tfloat dotNL = saturate( dot( geometryNormal, directLight.direction ) );\n\tvec3 irradiance = dotNL * directLight.color;\n\treflectedLight.directDiffuse += irradiance * BRDF_Lambert( material.diffuseColor );\n}\nvoid RE_IndirectDiffuse_Lambert( const in vec3 irradiance, const in vec3 geometryPosition, const in vec3 geometryNormal, const in vec3 geometryViewDir, const in vec3 geometryClearcoatNormal, const in LambertMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Lambert( material.diffuseColor );\n}\n#define RE_Direct\t\t\t\tRE_Direct_Lambert\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_Lambert";


    var lights_pars_begin = "uniform bool receiveShadow;\nuniform vec3 ambientLightColor;\n#if defined( USE_LIGHT_PROBES )\n\tuniform vec3 lightProbe[ 9 ];\n#endif\nvec3 shGetIrradianceAt( in vec3 normal, in vec3 shCoefficients[ 9 ] ) {\n\tfloat x = normal.x, y = normal.y, z = normal.z;\n\tvec3 result = shCoefficients[ 0 ] * 0.886227;\n\tresult += shCoefficients[ 1 ] * 2.0 * 0.511664 * y;\n\tresult += shCoefficients[ 2 ] * 2.0 * 0.511664 * z;\n\tresult += shCoefficients[ 3 ] * 2.0 * 0.511664 * x;\n\tresult += shCoefficients[ 4 ] * 2.0 * 0.429043 * x * y;\n\tresult += shCoefficients[ 5 ] * 2.0 * 0.429043 * y * z;\n\tresult += shCoefficients[ 6 ] * ( 0.743125 * z * z - 0.247708 );\n\tresult += shCoefficients[ 7 ] * 2.0 * 0.429043 * x * z;\n\tresult += shCoefficients[ 8 ] * 0.429043 * ( x * x - y * y );\n\treturn result;\n}\nvec3 getLightProbeIrradiance( const in vec3 lightProbe[ 9 ], const in vec3 normal ) {\n\tvec3 worldNormal = inverseTransformDirection( normal, viewMatrix );\n\tvec3 irradiance = shGetIrradianceAt( worldNormal, lightProbe );\n\treturn irradiance;\n}\nvec3 getAmbientLightIrradiance( const in vec3 ambientLightColor ) {\n\tvec3 irradiance = ambientLightColor;\n\treturn irradiance;\n}\nfloat getDistanceAttenuation( const in float lightDistance, const in float cutoffDistance, const in float decayExponent ) {\n\t#if defined ( LEGACY_LIGHTS )\n\t\tif ( cutoffDistance > 0.0 && decayExponent > 0.0 ) {\n\t\t\treturn pow( saturate( - lightDistance / cutoffDistance + 1.0 ), decayExponent );\n\t\t}\n\t\treturn 1.0;\n\t#else\n\t\tfloat distanceFalloff = 1.0 / max( pow( lightDistance, decayExponent ), 0.01 );\n\t\tif ( cutoffDistance > 0.0 ) {\n\t\t\tdistanceFalloff *= pow2( saturate( 1.0 - pow4( lightDistance / cutoffDistance ) ) );\n\t\t}\n\t\treturn distanceFalloff;\n\t#endif\n}\nfloat getSpotAttenuation( const in float coneCosine, const in float penumbraCosine, const in float angleCosine ) {\n\treturn smoothstep( coneCosine, penumbraCosine, angleCosine );\n}\n#if NUM_DIR_LIGHTS > 0\n\tstruct DirectionalLight {\n\t\tvec3 direction;\n\t\tvec3 color;\n\t};\n\tuniform DirectionalLight directionalLights[ NUM_DIR_LIGHTS ];\n\tvoid getDirectionalLightInfo( const in DirectionalLight directionalLight, out IncidentLight light ) {\n\t\tlight.color = directionalLight.color;\n\t\tlight.direction = directionalLight.direction;\n\t\tlight.visible = true;\n\t}\n#endif\n#if NUM_POINT_LIGHTS > 0\n\tstruct PointLight {\n\t\tvec3 position;\n\t\tvec3 color;\n\t\tfloat distance;\n\t\tfloat decay;\n\t};\n\tuniform PointLight pointLights[ NUM_POINT_LIGHTS ];\n\tvoid getPointLightInfo( const in PointLight pointLight, const in vec3 geometryPosition, out IncidentLight light ) {\n\t\tvec3 lVector = pointLight.position - geometryPosition;\n\t\tlight.direction = normalize( lVector );\n\t\tfloat lightDistance = length( lVector );\n\t\tlight.color = pointLight.color;\n\t\tlight.color *= getDistanceAttenuation( lightDistance, pointLight.distance, pointLight.decay );\n\t\tlight.visible = ( light.color != vec3( 0.0 ) );\n\t}\n#endif\n#if NUM_SPOT_LIGHTS > 0\n\tstruct SpotLight {\n\t\tvec3 position;\n\t\tvec3 direction;\n\t\tvec3 color;\n\t\tfloat distance;\n\t\tfloat decay;\n\t\tfloat coneCos;\n\t\tfloat penumbraCos;\n\t};\n\tuniform SpotLight spotLights[ NUM_SPOT_LIGHTS ];\n\tvoid getSpotLightInfo( const in SpotLight spotLight, const in vec3 geometryPosition, out IncidentLight light ) {\n\t\tvec3 lVector = spotLight.position - geometryPosition;\n\t\tlight.direction = normalize( lVector );\n\t\tfloat angleCos = dot( light.direction, spotLight.direction );\n\t\tfloat spotAttenuation = getSpotAttenuation( spotLight.coneCos, spotLight.penumbraCos, angleCos );\n\t\tif ( spotAttenuation > 0.0 ) {\n\t\t\tfloat lightDistance = length( lVector );\n\t\t\tlight.color = spotLight.color * spotAttenuation;\n\t\t\tlight.color *= getDistanceAttenuation( lightDistance, spotLight.distance, spotLight.decay );\n\t\t\tlight.visible = ( light.color != vec3( 0.0 ) );\n\t\t} else {\n\t\t\tlight.color = vec3( 0.0 );\n\t\t\tlight.visible = false;\n\t\t}\n\t}\n#endif\n#if NUM_RECT_AREA_LIGHTS > 0\n\tstruct RectAreaLight {\n\t\tvec3 color;\n\t\tvec3 position;\n\t\tvec3 halfWidth;\n\t\tvec3 halfHeight;\n\t};\n\tuniform sampler2D ltc_1;\tuniform sampler2D ltc_2;\n\tuniform RectAreaLight rectAreaLights[ NUM_RECT_AREA_LIGHTS ];\n#endif\n#if NUM_HEMI_LIGHTS > 0\n\tstruct HemisphereLight {\n\t\tvec3 direction;\n\t\tvec3 skyColor;\n\t\tvec3 groundColor;\n\t};\n\tuniform HemisphereLight hemisphereLights[ NUM_HEMI_LIGHTS ];\n\tvec3 getHemisphereLightIrradiance( const in HemisphereLight hemiLight, const in vec3 normal ) {\n\t\tfloat dotNL = dot( normal, hemiLight.direction );\n\t\tfloat hemiDiffuseWeight = 0.5 * dotNL + 0.5;\n\t\tvec3 irradiance = mix( hemiLight.groundColor, hemiLight.skyColor, hemiDiffuseWeight );\n\t\treturn irradiance;\n\t}\n#endif";


    var envmap_physical_pars_fragment = "#ifdef USE_ENVMAP\n\tvec3 getIBLIrradiance( const in vec3 normal ) {\n\t\t#ifdef ENVMAP_TYPE_CUBE_UV\n\t\t\tvec3 worldNormal = inverseTransformDirection( normal, viewMatrix );\n\t\t\tvec4 envMapColor = textureCubeUV( envMap, worldNormal, 1.0 );\n\t\t\treturn PI * envMapColor.rgb * envMapIntensity;\n\t\t#else\n\t\t\treturn vec3( 0.0 );\n\t\t#endif\n\t}\n\tvec3 getIBLRadiance( const in vec3 viewDir, const in vec3 normal, const in float roughness ) {\n\t\t#ifdef ENVMAP_TYPE_CUBE_UV\n\t\t\tvec3 reflectVec = reflect( - viewDir, normal );\n\t\t\treflectVec = normalize( mix( reflectVec, normal, roughness * roughness) );\n\t\t\treflectVec = inverseTransformDirection( reflectVec, viewMatrix );\n\t\t\tvec4 envMapColor = textureCubeUV( envMap, reflectVec, roughness );\n\t\t\treturn envMapColor.rgb * envMapIntensity;\n\t\t#else\n\t\t\treturn vec3( 0.0 );\n\t\t#endif\n\t}\n\t#ifdef USE_ANISOTROPY\n\t\tvec3 getIBLAnisotropyRadiance( const in vec3 viewDir, const in vec3 normal, const in float roughness, const in vec3 bitangent, const in float anisotropy ) {\n\t\t\t#ifdef ENVMAP_TYPE_CUBE_UV\n\t\t\t\tvec3 bentNormal = cross( bitangent, viewDir );\n\t\t\t\tbentNormal = normalize( cross( bentNormal, bitangent ) );\n\t\t\t\tbentNormal = normalize( mix( bentNormal, normal, pow2( pow2( 1.0 - anisotropy * ( 1.0 - roughness ) ) ) ) );\n\t\t\t\treturn getIBLRadiance( viewDir, bentNormal, roughness );\n\t\t\t#else\n\t\t\t\treturn vec3( 0.0 );\n\t\t\t#endif\n\t\t}\n\t#endif\n#endif";


    var lights_toon_fragment = "ToonMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb;";


    var lights_toon_pars_fragment = "varying vec3 vViewPosition;\nstruct ToonMaterial {\n\tvec3 diffuseColor;\n};\nvoid RE_Direct_Toon( const in IncidentLight directLight, const in vec3 geometryPosition, const in vec3 geometryNormal, const in vec3 geometryViewDir, const in vec3 geometryClearcoatNormal, const in ToonMaterial material, inout ReflectedLight reflectedLight ) {\n\tvec3 irradiance = getGradientIrradiance( geometryNormal, directLight.direction ) * directLight.color;\n\treflectedLight.directDiffuse += irradiance * BRDF_Lambert( material.diffuseColor );\n}\nvoid RE_IndirectDiffuse_Toon( const in vec3 irradiance, const in vec3 geometryPosition, const in vec3 geometryNormal, const in vec3 geometryViewDir, const in vec3 geometryClearcoatNormal, const in ToonMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Lambert( material.diffuseColor );\n}\n#define RE_Direct\t\t\t\tRE_Direct_Toon\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_Toon";


    var lights_phong_fragment = "BlinnPhongMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb;\nmaterial.specularColor = specular;\nmaterial.specularShininess = shininess;\nmaterial.specularStrength = specularStrength;";


    var lights_phong_pars_fragment = "varying vec3 vViewPosition;\nstruct BlinnPhongMaterial {\n\tvec3 diffuseColor;\n\tvec3 specularColor;\n\tfloat specularShininess;\n\tfloat specularStrength;\n};\nvoid RE_Direct_BlinnPhong( const in IncidentLight directLight, const in vec3 geometryPosition, const in vec3 geometryNormal, const in vec3 geometryViewDir, const in vec3 geometryClearcoatNormal, const in BlinnPhongMaterial material, inout ReflectedLight reflectedLight ) {\n\tfloat dotNL = saturate( dot( geometryNormal, directLight.direction ) );\n\tvec3 irradiance = dotNL * directLight.color;\n\treflectedLight.directDiffuse += irradiance * BRDF_Lambert( material.diffuseColor );\n\treflectedLight.directSpecular += irradiance * BRDF_BlinnPhong( directLight.direction, geometryViewDir, geometryNormal, material.specularColor, material.specularShininess ) * material.specularStrength;\n}\nvoid RE_IndirectDiffuse_BlinnPhong( const in vec3 irradiance, const in vec3 geometryPosition, const in vec3 geometryNormal, const in vec3 geometryViewDir, const in vec3 geometryClearcoatNormal, const in BlinnPhongMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Lambert( material.diffuseColor );\n}\n#define RE_Direct\t\t\t\tRE_Direct_BlinnPhong\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_BlinnPhong";


    var lights_physical_fragment = "PhysicalMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb * ( 1.0 - metalnessFactor );\nvec3 dxy = max( abs( dFdx( nonPerturbedNormal ) ), abs( dFdy( nonPerturbedNormal ) ) );\nfloat geometryRoughness = max( max( dxy.x, dxy.y ), dxy.z );\nmaterial.roughness = max( roughnessFactor, 0.0525 );material.roughness += geometryRoughness;\nmaterial.roughness = min( material.roughness, 1.0 );\n#ifdef IOR\n\tmaterial.ior = ior;\n\t#ifdef USE_SPECULAR\n\t\tfloat specularIntensityFactor = specularIntensity;\n\t\tvec3 specularColorFactor = specularColor;\n\t\t#ifdef USE_SPECULAR_COLORMAP\n\t\t\tspecularColorFactor *= texture2D( specularColorMap, vSpecularColorMapUv ).rgb;\n\t\t#endif\n\t\t#ifdef USE_SPECULAR_INTENSITYMAP\n\t\t\tspecularIntensityFactor *= texture2D( specularIntensityMap, vSpecularIntensityMapUv ).a;\n\t\t#endif\n\t\tmaterial.specularF90 = mix( specularIntensityFactor, 1.0, metalnessFactor );\n\t#else\n\t\tfloat specularIntensityFactor = 1.0;\n\t\tvec3 specularColorFactor = vec3( 1.0 );\n\t\tmaterial.specularF90 = 1.0;\n\t#endif\n\tmaterial.specularColor = mix( min( pow2( ( material.ior - 1.0 ) / ( material.ior + 1.0 ) ) * specularColorFactor, vec3( 1.0 ) ) * specularIntensityFactor, diffuseColor.rgb, metalnessFactor );\n#else\n\tmaterial.specularColor = mix( vec3( 0.04 ), diffuseColor.rgb, metalnessFactor );\n\tmaterial.specularF90 = 1.0;\n#endif\n#ifdef USE_CLEARCOAT\n\tmaterial.clearcoat = clearcoat;\n\tmaterial.clearcoatRoughness = clearcoatRoughness;\n\tmaterial.clearcoatF0 = vec3( 0.04 );\n\tmaterial.clearcoatF90 = 1.0;\n\t#ifdef USE_CLEARCOATMAP\n\t\tmaterial.clearcoat *= texture2D( clearcoatMap, vClearcoatMapUv ).x;\n\t#endif\n\t#ifdef USE_CLEARCOAT_ROUGHNESSMAP\n\t\tmaterial.clearcoatRoughness *= texture2D( clearcoatRoughnessMap, vClearcoatRoughnessMapUv ).y;\n\t#endif\n\tmaterial.clearcoat = saturate( material.clearcoat );\tmaterial.clearcoatRoughness = max( material.clearcoatRoughness, 0.0525 );\n\tmaterial.clearcoatRoughness += geometryRoughness;\n\tmaterial.clearcoatRoughness = min( material.clearcoatRoughness, 1.0 );\n#endif\n#ifdef USE_IRIDESCENCE\n\tmaterial.iridescence = iridescence;\n\tmaterial.iridescenceIOR = iridescenceIOR;\n\t#ifdef USE_IRIDESCENCEMAP\n\t\tmaterial.iridescence *= texture2D( iridescenceMap, vIridescenceMapUv ).r;\n\t#endif\n\t#ifdef USE_IRIDESCENCE_THICKNESSMAP\n\t\tmaterial.iridescenceThickness = (iridescenceThicknessMaximum - iridescenceThicknessMinimum) * texture2D( iridescenceThicknessMap, vIridescenceThicknessMapUv ).g + iridescenceThicknessMinimum;\n\t#else\n\t\tmaterial.iridescenceThickness = iridescenceThicknessMaximum;\n\t#endif\n#endif\n#ifdef USE_SHEEN\n\tmaterial.sheenColor = sheenColor;\n\t#ifdef USE_SHEEN_COLORMAP\n\t\tmaterial.sheenColor *= texture2D( sheenColorMap, vSheenColorMapUv ).rgb;\n\t#endif\n\tmaterial.sheenRoughness = clamp( sheenRoughness, 0.07, 1.0 );\n\t#ifdef USE_SHEEN_ROUGHNESSMAP\n\t\tmaterial.sheenRoughness *= texture2D( sheenRoughnessMap, vSheenRoughnessMapUv ).a;\n\t#endif\n#endif\n#ifdef USE_ANISOTROPY\n\t#ifdef USE_ANISOTROPYMAP\n\t\tmat2 anisotropyMat = mat2( anisotropyVector.x, anisotropyVector.y, - anisotropyVector.y, anisotropyVector.x );\n\t\tvec3 anisotropyPolar = texture2D( anisotropyMap, vAnisotropyMapUv ).rgb;\n\t\tvec2 anisotropyV = anisotropyMat * normalize( 2.0 * anisotropyPolar.rg - vec2( 1.0 ) ) * anisotropyPolar.b;\n\t#else\n\t\tvec2 anisotropyV = anisotropyVector;\n\t#endif\n\tmaterial.anisotropy = length( anisotropyV );\n\tif( material.anisotropy == 0.0 ) {\n\t\tanisotropyV = vec2( 1.0, 0.0 );\n\t} else {\n\t\tanisotropyV /= material.anisotropy;\n\t\tmaterial.anisotropy = saturate( material.anisotropy );\n\t}\n\tmaterial.alphaT = mix( pow2( material.roughness ), 1.0, pow2( material.anisotropy ) );\n\tmaterial.anisotropyT = tbn[ 0 ] * anisotropyV.x + tbn[ 1 ] * anisotropyV.y;\n\tmaterial.anisotropyB = tbn[ 1 ] * anisotropyV.x - tbn[ 0 ] * anisotropyV.y;\n#endif";


    var lights_physical_pars_fragment = "struct PhysicalMaterial {\n\tvec3 diffuseColor;\n\tfloat roughness;\n\tvec3 specularColor;\n\tfloat specularF90;\n\t#ifdef USE_CLEARCOAT\n\t\tfloat clearcoat;\n\t\tfloat clearcoatRoughness;\n\t\tvec3 clearcoatF0;\n\t\tfloat clearcoatF90;\n\t#endif\n\t#ifdef USE_IRIDESCENCE\n\t\tfloat iridescence;\n\t\tfloat iridescenceIOR;\n\t\tfloat iridescenceThickness;\n\t\tvec3 iridescenceFresnel;\n\t\tvec3 iridescenceF0;\n\t#endif\n\t#ifdef USE_SHEEN\n\t\tvec3 sheenColor;\n\t\tfloat sheenRoughness;\n\t#endif\n\t#ifdef IOR\n\t\tfloat ior;\n\t#endif\n\t#ifdef USE_TRANSMISSION\n\t\tfloat transmission;\n\t\tfloat transmissionAlpha;\n\t\tfloat thickness;\n\t\tfloat attenuationDistance;\n\t\tvec3 attenuationColor;\n\t#endif\n\t#ifdef USE_ANISOTROPY\n\t\tfloat anisotropy;\n\t\tfloat alphaT;\n\t\tvec3 anisotropyT;\n\t\tvec3 anisotropyB;\n\t#endif\n};\nvec3 clearcoatSpecularDirect = vec3( 0.0 );\nvec3 clearcoatSpecularIndirect = vec3( 0.0 );\nvec3 sheenSpecularDirect = vec3( 0.0 );\nvec3 sheenSpecularIndirect = vec3(0.0 );\nvec3 Schlick_to_F0( const in vec3 f, const in float f90, const in float dotVH ) {\n    float x = clamp( 1.0 - dotVH, 0.0, 1.0 );\n    float x2 = x * x;\n    float x5 = clamp( x * x2 * x2, 0.0, 0.9999 );\n    return ( f - vec3( f90 ) * x5 ) / ( 1.0 - x5 );\n}\nfloat V_GGX_SmithCorrelated( const in float alpha, const in float dotNL, const in float dotNV ) {\n\tfloat a2 = pow2( alpha );\n\tfloat gv = dotNL * sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNV ) );\n\tfloat gl = dotNV * sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNL ) );\n\treturn 0.5 / max( gv + gl, EPSILON );\n}\nfloat D_GGX( const in float alpha, const in float dotNH ) {\n\tfloat a2 = pow2( alpha );\n\tfloat denom = pow2( dotNH ) * ( a2 - 1.0 ) + 1.0;\n\treturn RECIPROCAL_PI * a2 / pow2( denom );\n}\n#ifdef USE_ANISOTROPY\n\tfloat V_GGX_SmithCorrelated_Anisotropic( const in float alphaT, const in float alphaB, const in float dotTV, const in float dotBV, const in float dotTL, const in float dotBL, const in float dotNV, const in float dotNL ) {\n\t\tfloat gv = dotNL * length( vec3( alphaT * dotTV, alphaB * dotBV, dotNV ) );\n\t\tfloat gl = dotNV * length( vec3( alphaT * dotTL, alphaB * dotBL, dotNL ) );\n\t\tfloat v = 0.5 / ( gv + gl );\n\t\treturn saturate(v);\n\t}\n\tfloat D_GGX_Anisotropic( const in float alphaT, const in float alphaB, const in float dotNH, const in float dotTH, const in float dotBH ) {\n\t\tfloat a2 = alphaT * alphaB;\n\t\thighp vec3 v = vec3( alphaB * dotTH, alphaT * dotBH, a2 * dotNH );\n\t\thighp float v2 = dot( v, v );\n\t\tfloat w2 = a2 / v2;\n\t\treturn RECIPROCAL_PI * a2 * pow2 ( w2 );\n\t}\n#endif\n#ifdef USE_CLEARCOAT\n\tvec3 BRDF_GGX_Clearcoat( const in vec3 lightDir, const in vec3 viewDir, const in vec3 normal, const in PhysicalMaterial material) {\n\t\tvec3 f0 = material.clearcoatF0;\n\t\tfloat f90 = material.clearcoatF90;\n\t\tfloat roughness = material.clearcoatRoughness;\n\t\tfloat alpha = pow2( roughness );\n\t\tvec3 halfDir = normalize( lightDir + viewDir );\n\t\tfloat dotNL = saturate( dot( normal, lightDir ) );\n\t\tfloat dotNV = saturate( dot( normal, viewDir ) );\n\t\tfloat dotNH = saturate( dot( normal, halfDir ) );\n\t\tfloat dotVH = saturate( dot( viewDir, halfDir ) );\n\t\tvec3 F = F_Schlick( f0, f90, dotVH );\n\t\tfloat V = V_GGX_SmithCorrelated( alpha, dotNL, dotNV );\n\t\tfloat D = D_GGX( alpha, dotNH );\n\t\treturn F * ( V * D );\n\t}\n#endif\nvec3 BRDF_GGX( const in vec3 lightDir, const in vec3 viewDir, const in vec3 normal, const in PhysicalMaterial material ) {\n\tvec3 f0 = material.specularColor;\n\tfloat f90 = material.specularF90;\n\tfloat roughness = material.roughness;\n\tfloat alpha = pow2( roughness );\n\tvec3 halfDir = normalize( lightDir + viewDir );\n\tfloat dotNL = saturate( dot( normal, lightDir ) );\n\tfloat dotNV = saturate( dot( normal, viewDir ) );\n\tfloat dotNH = saturate( dot( normal, halfDir ) );\n\tfloat dotVH = saturate( dot( viewDir, halfDir ) );\n\tvec3 F = F_Schlick( f0, f90, dotVH );\n\t#ifdef USE_IRIDESCENCE\n\t\tF = mix( F, material.iridescenceFresnel, material.iridescence );\n\t#endif\n\t#ifdef USE_ANISOTROPY\n\t\tfloat dotTL = dot( material.anisotropyT, lightDir );\n\t\tfloat dotTV = dot( material.anisotropyT, viewDir );\n\t\tfloat dotTH = dot( material.anisotropyT, halfDir );\n\t\tfloat dotBL = dot( material.anisotropyB, lightDir );\n\t\tfloat dotBV = dot( material.anisotropyB, viewDir );\n\t\tfloat dotBH = dot( material.anisotropyB, halfDir );\n\t\tfloat V = V_GGX_SmithCorrelated_Anisotropic( material.alphaT, alpha, dotTV, dotBV, dotTL, dotBL, dotNV, dotNL );\n\t\tfloat D = D_GGX_Anisotropic( material.alphaT, alpha, dotNH, dotTH, dotBH );\n\t#else\n\t\tfloat V = V_GGX_SmithCorrelated( alpha, dotNL, dotNV );\n\t\tfloat D = D_GGX( alpha, dotNH );\n\t#endif\n\treturn F * ( V * D );\n}\nvec2 LTC_Uv( const in vec3 N, const in vec3 V, const in float roughness ) {\n\tconst float LUT_SIZE = 64.0;\n\tconst float LUT_SCALE = ( LUT_SIZE - 1.0 ) / LUT_SIZE;\n\tconst float LUT_BIAS = 0.5 / LUT_SIZE;\n\tfloat dotNV = saturate( dot( N, V ) );\n\tvec2 uv = vec2( roughness, sqrt( 1.0 - dotNV ) );\n\tuv = uv * LUT_SCALE + LUT_BIAS;\n\treturn uv;\n}\nfloat LTC_ClippedSphereFormFactor( const in vec3 f ) {\n\tfloat l = length( f );\n\treturn max( ( l * l + f.z ) / ( l + 1.0 ), 0.0 );\n}\nvec3 LTC_EdgeVectorFormFactor( const in vec3 v1, const in vec3 v2 ) {\n\tfloat x = dot( v1, v2 );\n\tfloat y = abs( x );\n\tfloat a = 0.8543985 + ( 0.4965155 + 0.0145206 * y ) * y;\n\tfloat b = 3.4175940 + ( 4.1616724 + y ) * y;\n\tfloat v = a / b;\n\tfloat theta_sintheta = ( x > 0.0 ) ? v : 0.5 * inversesqrt( max( 1.0 - x * x, 1e-7 ) ) - v;\n\treturn cross( v1, v2 ) * theta_sintheta;\n}\nvec3 LTC_Evaluate( const in vec3 N, const in vec3 V, const in vec3 P, const in mat3 mInv, const in vec3 rectCoords[ 4 ] ) {\n\tvec3 v1 = rectCoords[ 1 ] - rectCoords[ 0 ];\n\tvec3 v2 = rectCoords[ 3 ] - rectCoords[ 0 ];\n\tvec3 lightNormal = cross( v1, v2 );\n\tif( dot( lightNormal, P - rectCoords[ 0 ] ) < 0.0 ) return vec3( 0.0 );\n\tvec3 T1, T2;\n\tT1 = normalize( V - N * dot( V, N ) );\n\tT2 = - cross( N, T1 );\n\tmat3 mat = mInv * transposeMat3( mat3( T1, T2, N ) );\n\tvec3 coords[ 4 ];\n\tcoords[ 0 ] = mat * ( rectCoords[ 0 ] - P );\n\tcoords[ 1 ] = mat * ( rectCoords[ 1 ] - P );\n\tcoords[ 2 ] = mat * ( rectCoords[ 2 ] - P );\n\tcoords[ 3 ] = mat * ( rectCoords[ 3 ] - P );\n\tcoords[ 0 ] = normalize( coords[ 0 ] );\n\tcoords[ 1 ] = normalize( coords[ 1 ] );\n\tcoords[ 2 ] = normalize( coords[ 2 ] );\n\tcoords[ 3 ] = normalize( coords[ 3 ] );\n\tvec3 vectorFormFactor = vec3( 0.0 );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 0 ], coords[ 1 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 1 ], coords[ 2 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 2 ], coords[ 3 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 3 ], coords[ 0 ] );\n\tfloat result = LTC_ClippedSphereFormFactor( vectorFormFactor );\n\treturn vec3( result );\n}\n#if defined( USE_SHEEN )\nfloat D_Charlie( float roughness, float dotNH ) {\n\tfloat alpha = pow2( roughness );\n\tfloat invAlpha = 1.0 / alpha;\n\tfloat cos2h = dotNH * dotNH;\n\tfloat sin2h = max( 1.0 - cos2h, 0.0078125 );\n\treturn ( 2.0 + invAlpha ) * pow( sin2h, invAlpha * 0.5 ) / ( 2.0 * PI );\n}\nfloat V_Neubelt( float dotNV, float dotNL ) {\n\treturn saturate( 1.0 / ( 4.0 * ( dotNL + dotNV - dotNL * dotNV ) ) );\n}\nvec3 BRDF_Sheen( const in vec3 lightDir, const in vec3 viewDir, const in vec3 normal, vec3 sheenColor, const in float sheenRoughness ) {\n\tvec3 halfDir = normalize( lightDir + viewDir );\n\tfloat dotNL = saturate( dot( normal, lightDir ) );\n\tfloat dotNV = saturate( dot( normal, viewDir ) );\n\tfloat dotNH = saturate( dot( normal, halfDir ) );\n\tfloat D = D_Charlie( sheenRoughness, dotNH );\n\tfloat V = V_Neubelt( dotNV, dotNL );\n\treturn sheenColor * ( D * V );\n}\n#endif\nfloat IBLSheenBRDF( const in vec3 normal, const in vec3 viewDir, const in float roughness ) {\n\tfloat dotNV = saturate( dot( normal, viewDir ) );\n\tfloat r2 = roughness * roughness;\n\tfloat a = roughness < 0.25 ? -339.2 * r2 + 161.4 * roughness - 25.9 : -8.48 * r2 + 14.3 * roughness - 9.95;\n\tfloat b = roughness < 0.25 ? 44.0 * r2 - 23.7 * roughness + 3.26 : 1.97 * r2 - 3.27 * roughness + 0.72;\n\tfloat DG = exp( a * dotNV + b ) + ( roughness < 0.25 ? 0.0 : 0.1 * ( roughness - 0.25 ) );\n\treturn saturate( DG * RECIPROCAL_PI );\n}\nvec2 DFGApprox( const in vec3 normal, const in vec3 viewDir, const in float roughness ) {\n\tfloat dotNV = saturate( dot( normal, viewDir ) );\n\tconst vec4 c0 = vec4( - 1, - 0.0275, - 0.572, 0.022 );\n\tconst vec4 c1 = vec4( 1, 0.0425, 1.04, - 0.04 );\n\tvec4 r = roughness * c0 + c1;\n\tfloat a004 = min( r.x * r.x, exp2( - 9.28 * dotNV ) ) * r.x + r.y;\n\tvec2 fab = vec2( - 1.04, 1.04 ) * a004 + r.zw;\n\treturn fab;\n}\nvec3 EnvironmentBRDF( const in vec3 normal, const in vec3 viewDir, const in vec3 specularColor, const in float specularF90, const in float roughness ) {\n\tvec2 fab = DFGApprox( normal, viewDir, roughness );\n\treturn specularColor * fab.x + specularF90 * fab.y;\n}\n#ifdef USE_IRIDESCENCE\nvoid computeMultiscatteringIridescence( const in vec3 normal, const in vec3 viewDir, const in vec3 specularColor, const in float specularF90, const in float iridescence, const in vec3 iridescenceF0, const in float roughness, inout vec3 singleScatter, inout vec3 multiScatter ) {\n#else\nvoid computeMultiscattering( const in vec3 normal, const in vec3 viewDir, const in vec3 specularColor, const in float specularF90, const in float roughness, inout vec3 singleScatter, inout vec3 multiScatter ) {\n#endif\n\tvec2 fab = DFGApprox( normal, viewDir, roughness );\n\t#ifdef USE_IRIDESCENCE\n\t\tvec3 Fr = mix( specularColor, iridescenceF0, iridescence );\n\t#else\n\t\tvec3 Fr = specularColor;\n\t#endif\n\tvec3 FssEss = Fr * fab.x + specularF90 * fab.y;\n\tfloat Ess = fab.x + fab.y;\n\tfloat Ems = 1.0 - Ess;\n\tvec3 Favg = Fr + ( 1.0 - Fr ) * 0.047619;\tvec3 Fms = FssEss * Favg / ( 1.0 - Ems * Favg );\n\tsingleScatter += FssEss;\n\tmultiScatter += Fms * Ems;\n}\n#if NUM_RECT_AREA_LIGHTS > 0\n\tvoid RE_Direct_RectArea_Physical( const in RectAreaLight rectAreaLight, const in vec3 geometryPosition, const in vec3 geometryNormal, const in vec3 geometryViewDir, const in vec3 geometryClearcoatNormal, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\t\tvec3 normal = geometryNormal;\n\t\tvec3 viewDir = geometryViewDir;\n\t\tvec3 position = geometryPosition;\n\t\tvec3 lightPos = rectAreaLight.position;\n\t\tvec3 halfWidth = rectAreaLight.halfWidth;\n\t\tvec3 halfHeight = rectAreaLight.halfHeight;\n\t\tvec3 lightColor = rectAreaLight.color;\n\t\tfloat roughness = material.roughness;\n\t\tvec3 rectCoords[ 4 ];\n\t\trectCoords[ 0 ] = lightPos + halfWidth - halfHeight;\t\trectCoords[ 1 ] = lightPos - halfWidth - halfHeight;\n\t\trectCoords[ 2 ] = lightPos - halfWidth + halfHeight;\n\t\trectCoords[ 3 ] = lightPos + halfWidth + halfHeight;\n\t\tvec2 uv = LTC_Uv( normal, viewDir, roughness );\n\t\tvec4 t1 = texture2D( ltc_1, uv );\n\t\tvec4 t2 = texture2D( ltc_2, uv );\n\t\tmat3 mInv = mat3(\n\t\t\tvec3( t1.x, 0, t1.y ),\n\t\t\tvec3(    0, 1,    0 ),\n\t\t\tvec3( t1.z, 0, t1.w )\n\t\t);\n\t\tvec3 fresnel = ( material.specularColor * t2.x + ( vec3( 1.0 ) - material.specularColor ) * t2.y );\n\t\treflectedLight.directSpecular += lightColor * fresnel * LTC_Evaluate( normal, viewDir, position, mInv, rectCoords );\n\t\treflectedLight.directDiffuse += lightColor * material.diffuseColor * LTC_Evaluate( normal, viewDir, position, mat3( 1.0 ), rectCoords );\n\t}\n#endif\nvoid RE_Direct_Physical( const in IncidentLight directLight, const in vec3 geometryPosition, const in vec3 geometryNormal, const in vec3 geometryViewDir, const in vec3 geometryClearcoatNormal, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\tfloat dotNL = saturate( dot( geometryNormal, directLight.direction ) );\n\tvec3 irradiance = dotNL * directLight.color;\n\t#ifdef USE_CLEARCOAT\n\t\tfloat dotNLcc = saturate( dot( geometryClearcoatNormal, directLight.direction ) );\n\t\tvec3 ccIrradiance = dotNLcc * directLight.color;\n\t\tclearcoatSpecularDirect += ccIrradiance * BRDF_GGX_Clearcoat( directLight.direction, geometryViewDir, geometryClearcoatNormal, material );\n\t#endif\n\t#ifdef USE_SHEEN\n\t\tsheenSpecularDirect += irradiance * BRDF_Sheen( directLight.direction, geometryViewDir, geometryNormal, material.sheenColor, material.sheenRoughness );\n\t#endif\n\treflectedLight.directSpecular += irradiance * BRDF_GGX( directLight.direction, geometryViewDir, geometryNormal, material );\n\treflectedLight.directDiffuse += irradiance * BRDF_Lambert( material.diffuseColor );\n}\nvoid RE_IndirectDiffuse_Physical( const in vec3 irradiance, const in vec3 geometryPosition, const in vec3 geometryNormal, const in vec3 geometryViewDir, const in vec3 geometryClearcoatNormal, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Lambert( material.diffuseColor );\n}\nvoid RE_IndirectSpecular_Physical( const in vec3 radiance, const in vec3 irradiance, const in vec3 clearcoatRadiance, const in vec3 geometryPosition, const in vec3 geometryNormal, const in vec3 geometryViewDir, const in vec3 geometryClearcoatNormal, const in PhysicalMaterial material, inout ReflectedLight reflectedLight) {\n\t#ifdef USE_CLEARCOAT\n\t\tclearcoatSpecularIndirect += clearcoatRadiance * EnvironmentBRDF( geometryClearcoatNormal, geometryViewDir, material.clearcoatF0, material.clearcoatF90, material.clearcoatRoughness );\n\t#endif\n\t#ifdef USE_SHEEN\n\t\tsheenSpecularIndirect += irradiance * material.sheenColor * IBLSheenBRDF( geometryNormal, geometryViewDir, material.sheenRoughness );\n\t#endif\n\tvec3 singleScattering = vec3( 0.0 );\n\tvec3 multiScattering = vec3( 0.0 );\n\tvec3 cosineWeightedIrradiance = irradiance * RECIPROCAL_PI;\n\t#ifdef USE_IRIDESCENCE\n\t\tcomputeMultiscatteringIridescence( geometryNormal, geometryViewDir, material.specularColor, material.specularF90, material.iridescence, material.iridescenceFresnel, material.roughness, singleScattering, multiScattering );\n\t#else\n\t\tcomputeMultiscattering( geometryNormal, geometryViewDir, material.specularColor, material.specularF90, material.roughness, singleScattering, multiScattering );\n\t#endif\n\tvec3 totalScattering = singleScattering + multiScattering;\n\tvec3 diffuse = material.diffuseColor * ( 1.0 - max( max( totalScattering.r, totalScattering.g ), totalScattering.b ) );\n\treflectedLight.indirectSpecular += radiance * singleScattering;\n\treflectedLight.indirectSpecular += multiScattering * cosineWeightedIrradiance;\n\treflectedLight.indirectDiffuse += diffuse * cosineWeightedIrradiance;\n}\n#define RE_Direct\t\t\t\tRE_Direct_Physical\n#define RE_Direct_RectArea\t\tRE_Direct_RectArea_Physical\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_Physical\n#define RE_IndirectSpecular\t\tRE_IndirectSpecular_Physical\nfloat computeSpecularOcclusion( const in float dotNV, const in float ambientOcclusion, const in float roughness ) {\n\treturn saturate( pow( dotNV + ambientOcclusion, exp2( - 16.0 * roughness - 1.0 ) ) - 1.0 + ambientOcclusion );\n}";


    var lights_fragment_begin = "\nvec3 geometryPosition = - vViewPosition;\nvec3 geometryNormal = normal;\nvec3 geometryViewDir = ( isOrthographic ) ? vec3( 0, 0, 1 ) : normalize( vViewPosition );\nvec3 geometryClearcoatNormal = vec3( 0.0 );\n#ifdef USE_CLEARCOAT\n\tgeometryClearcoatNormal = clearcoatNormal;\n#endif\n#ifdef USE_IRIDESCENCE\n\tfloat dotNVi = saturate( dot( normal, geometryViewDir ) );\n\tif ( material.iridescenceThickness == 0.0 ) {\n\t\tmaterial.iridescence = 0.0;\n\t} else {\n\t\tmaterial.iridescence = saturate( material.iridescence );\n\t}\n\tif ( material.iridescence > 0.0 ) {\n\t\tmaterial.iridescenceFresnel = evalIridescence( 1.0, material.iridescenceIOR, dotNVi, material.iridescenceThickness, material.specularColor );\n\t\tmaterial.iridescenceF0 = Schlick_to_F0( material.iridescenceFresnel, 1.0, dotNVi );\n\t}\n#endif\nIncidentLight directLight;\n#if ( NUM_POINT_LIGHTS > 0 ) && defined( RE_Direct )\n\tPointLight pointLight;\n\t#if defined( USE_SHADOWMAP ) && NUM_POINT_LIGHT_SHADOWS > 0\n\tPointLightShadow pointLightShadow;\n\t#endif\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {\n\t\tpointLight = pointLights[ i ];\n\t\tgetPointLightInfo( pointLight, geometryPosition, directLight );\n\t\t#if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_POINT_LIGHT_SHADOWS )\n\t\tpointLightShadow = pointLightShadows[ i ];\n\t\tdirectLight.color *= ( directLight.visible && receiveShadow ) ? getPointShadow( pointShadowMap[ i ], pointLightShadow.shadowMapSize, pointLightShadow.shadowBias, pointLightShadow.shadowRadius, vPointShadowCoord[ i ], pointLightShadow.shadowCameraNear, pointLightShadow.shadowCameraFar ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometryPosition, geometryNormal, geometryViewDir, geometryClearcoatNormal, material, reflectedLight );\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if ( NUM_SPOT_LIGHTS > 0 ) && defined( RE_Direct )\n\tSpotLight spotLight;\n\tvec4 spotColor;\n\tvec3 spotLightCoord;\n\tbool inSpotLightMap;\n\t#if defined( USE_SHADOWMAP ) && NUM_SPOT_LIGHT_SHADOWS > 0\n\tSpotLightShadow spotLightShadow;\n\t#endif\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_SPOT_LIGHTS; i ++ ) {\n\t\tspotLight = spotLights[ i ];\n\t\tgetSpotLightInfo( spotLight, geometryPosition, directLight );\n\t\t#if ( UNROLLED_LOOP_INDEX < NUM_SPOT_LIGHT_SHADOWS_WITH_MAPS )\n\t\t#define SPOT_LIGHT_MAP_INDEX UNROLLED_LOOP_INDEX\n\t\t#elif ( UNROLLED_LOOP_INDEX < NUM_SPOT_LIGHT_SHADOWS )\n\t\t#define SPOT_LIGHT_MAP_INDEX NUM_SPOT_LIGHT_MAPS\n\t\t#else\n\t\t#define SPOT_LIGHT_MAP_INDEX ( UNROLLED_LOOP_INDEX - NUM_SPOT_LIGHT_SHADOWS + NUM_SPOT_LIGHT_SHADOWS_WITH_MAPS )\n\t\t#endif\n\t\t#if ( SPOT_LIGHT_MAP_INDEX < NUM_SPOT_LIGHT_MAPS )\n\t\t\tspotLightCoord = vSpotLightCoord[ i ].xyz / vSpotLightCoord[ i ].w;\n\t\t\tinSpotLightMap = all( lessThan( abs( spotLightCoord * 2. - 1. ), vec3( 1.0 ) ) );\n\t\t\tspotColor = texture2D( spotLightMap[ SPOT_LIGHT_MAP_INDEX ], spotLightCoord.xy );\n\t\t\tdirectLight.color = inSpotLightMap ? directLight.color * spotColor.rgb : directLight.color;\n\t\t#endif\n\t\t#undef SPOT_LIGHT_MAP_INDEX\n\t\t#if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_SPOT_LIGHT_SHADOWS )\n\t\tspotLightShadow = spotLightShadows[ i ];\n\t\tdirectLight.color *= ( directLight.visible && receiveShadow ) ? getShadow( spotShadowMap[ i ], spotLightShadow.shadowMapSize, spotLightShadow.shadowBias, spotLightShadow.shadowRadius, vSpotLightCoord[ i ] ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometryPosition, geometryNormal, geometryViewDir, geometryClearcoatNormal, material, reflectedLight );\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if ( NUM_DIR_LIGHTS > 0 ) && defined( RE_Direct )\n\tDirectionalLight directionalLight;\n\t#if defined( USE_SHADOWMAP ) && NUM_DIR_LIGHT_SHADOWS > 0\n\tDirectionalLightShadow directionalLightShadow;\n\t#endif\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_DIR_LIGHTS; i ++ ) {\n\t\tdirectionalLight = directionalLights[ i ];\n\t\tgetDirectionalLightInfo( directionalLight, directLight );\n\t\t#if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_DIR_LIGHT_SHADOWS )\n\t\tdirectionalLightShadow = directionalLightShadows[ i ];\n\t\tdirectLight.color *= ( directLight.visible && receiveShadow ) ? getShadow( directionalShadowMap[ i ], directionalLightShadow.shadowMapSize, directionalLightShadow.shadowBias, directionalLightShadow.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometryPosition, geometryNormal, geometryViewDir, geometryClearcoatNormal, material, reflectedLight );\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if ( NUM_RECT_AREA_LIGHTS > 0 ) && defined( RE_Direct_RectArea )\n\tRectAreaLight rectAreaLight;\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_RECT_AREA_LIGHTS; i ++ ) {\n\t\trectAreaLight = rectAreaLights[ i ];\n\t\tRE_Direct_RectArea( rectAreaLight, geometryPosition, geometryNormal, geometryViewDir, geometryClearcoatNormal, material, reflectedLight );\n\t}\n\t#pragma unroll_loop_end\n#endif\n#if defined( RE_IndirectDiffuse )\n\tvec3 iblIrradiance = vec3( 0.0 );\n\tvec3 irradiance = getAmbientLightIrradiance( ambientLightColor );\n\t#if defined( USE_LIGHT_PROBES )\n\t\tirradiance += getLightProbeIrradiance( lightProbe, geometryNormal );\n\t#endif\n\t#if ( NUM_HEMI_LIGHTS > 0 )\n\t\t#pragma unroll_loop_start\n\t\tfor ( int i = 0; i < NUM_HEMI_LIGHTS; i ++ ) {\n\t\t\tirradiance += getHemisphereLightIrradiance( hemisphereLights[ i ], geometryNormal );\n\t\t}\n\t\t#pragma unroll_loop_end\n\t#endif\n#endif\n#if defined( RE_IndirectSpecular )\n\tvec3 radiance = vec3( 0.0 );\n\tvec3 clearcoatRadiance = vec3( 0.0 );\n#endif";


    var lights_fragment_maps = "#if defined( RE_IndirectDiffuse )\n\t#ifdef USE_LIGHTMAP\n\t\tvec4 lightMapTexel = texture2D( lightMap, vLightMapUv );\n\t\tvec3 lightMapIrradiance = lightMapTexel.rgb * lightMapIntensity;\n\t\tirradiance += lightMapIrradiance;\n\t#endif\n\t#if defined( USE_ENVMAP ) && defined( STANDARD ) && defined( ENVMAP_TYPE_CUBE_UV )\n\t\tiblIrradiance += getIBLIrradiance( geometryNormal );\n\t#endif\n#endif\n#if defined( USE_ENVMAP ) && defined( RE_IndirectSpecular )\n\t#ifdef USE_ANISOTROPY\n\t\tradiance += getIBLAnisotropyRadiance( geometryViewDir, geometryNormal, material.roughness, material.anisotropyB, material.anisotropy );\n\t#else\n\t\tradiance += getIBLRadiance( geometryViewDir, geometryNormal, material.roughness );\n\t#endif\n\t#ifdef USE_CLEARCOAT\n\t\tclearcoatRadiance += getIBLRadiance( geometryViewDir, geometryClearcoatNormal, material.clearcoatRoughness );\n\t#endif\n#endif";


    var lights_fragment_end = "#if defined( RE_IndirectDiffuse )\n\tRE_IndirectDiffuse( irradiance, geometryPosition, geometryNormal, geometryViewDir, geometryClearcoatNormal, material, reflectedLight );\n#endif\n#if defined( RE_IndirectSpecular )\n\tRE_IndirectSpecular( radiance, iblIrradiance, clearcoatRadiance, geometryPosition, geometryNormal, geometryViewDir, geometryClearcoatNormal, material, reflectedLight );\n#endif";


    var logdepthbuf_fragment = "#if defined( USE_LOGDEPTHBUF ) && defined( USE_LOGDEPTHBUF_EXT )\n\tgl_FragDepthEXT = vIsPerspective == 0.0 ? gl_FragCoord.z : log2( vFragDepth ) * logDepthBufFC * 0.5;\n#endif";


    var logdepthbuf_pars_fragment = "#if defined( USE_LOGDEPTHBUF ) && defined( USE_LOGDEPTHBUF_EXT )\n\tuniform float logDepthBufFC;\n\tvarying float vFragDepth;\n\tvarying float vIsPerspective;\n#endif";


    var logdepthbuf_pars_vertex = "#ifdef USE_LOGDEPTHBUF\n\t#ifdef USE_LOGDEPTHBUF_EXT\n\t\tvarying float vFragDepth;\n\t\tvarying float vIsPerspective;\n\t#else\n\t\tuniform float logDepthBufFC;\n\t#endif\n#endif";


    var logdepthbuf_vertex = "#ifdef USE_LOGDEPTHBUF\n\t#ifdef USE_LOGDEPTHBUF_EXT\n\t\tvFragDepth = 1.0 + gl_Position.w;\n\t\tvIsPerspective = float( isPerspectiveMatrix( projectionMatrix ) );\n\t#else\n\t\tif ( isPerspectiveMatrix( projectionMatrix ) ) {\n\t\t\tgl_Position.z = log2( max( EPSILON, gl_Position.w + 1.0 ) ) * logDepthBufFC - 1.0;\n\t\t\tgl_Position.z *= gl_Position.w;\n\t\t}\n\t#endif\n#endif";


    var map_fragment = "#ifdef USE_MAP\n\tvec4 sampledDiffuseColor = texture2D( map, vMapUv );\n\t#ifdef DECODE_VIDEO_TEXTURE\n\t\tsampledDiffuseColor = vec4( mix( pow( sampledDiffuseColor.rgb * 0.9478672986 + vec3( 0.0521327014 ), vec3( 2.4 ) ), sampledDiffuseColor.rgb * 0.0773993808, vec3( lessThanEqual( sampledDiffuseColor.rgb, vec3( 0.04045 ) ) ) ), sampledDiffuseColor.w );\n\t\n\t#endif\n\tdiffuseColor *= sampledDiffuseColor;\n#endif";


    var map_pars_fragment = "#ifdef USE_MAP\n\tuniform sampler2D map;\n#endif";


    var map_particle_fragment = "#if defined( USE_MAP ) || defined( USE_ALPHAMAP )\n\t#if defined( USE_POINTS_UV )\n\t\tvec2 uv = vUv;\n\t#else\n\t\tvec2 uv = ( uvTransform * vec3( gl_PointCoord.x, 1.0 - gl_PointCoord.y, 1 ) ).xy;\n\t#endif\n#endif\n#ifdef USE_MAP\n\tdiffuseColor *= texture2D( map, uv );\n#endif\n#ifdef USE_ALPHAMAP\n\tdiffuseColor.a *= texture2D( alphaMap, uv ).g;\n#endif";


    var map_particle_pars_fragment = "#if defined( USE_POINTS_UV )\n\tvarying vec2 vUv;\n#else\n\t#if defined( USE_MAP ) || defined( USE_ALPHAMAP )\n\t\tuniform mat3 uvTransform;\n\t#endif\n#endif\n#ifdef USE_MAP\n\tuniform sampler2D map;\n#endif\n#ifdef USE_ALPHAMAP\n\tuniform sampler2D alphaMap;\n#endif";


    var metalnessmap_fragment = "float metalnessFactor = metalness;\n#ifdef USE_METALNESSMAP\n\tvec4 texelMetalness = texture2D( metalnessMap, vMetalnessMapUv );\n\tmetalnessFactor *= texelMetalness.b;\n#endif";


    var metalnessmap_pars_fragment = "#ifdef USE_METALNESSMAP\n\tuniform sampler2D metalnessMap;\n#endif";


    var morphcolor_vertex = "#if defined( USE_MORPHCOLORS ) && defined( MORPHTARGETS_TEXTURE )\n\tvColor *= morphTargetBaseInfluence;\n\tfor ( int i = 0; i < MORPHTARGETS_COUNT; i ++ ) {\n\t\t#if defined( USE_COLOR_ALPHA )\n\t\t\tif ( morphTargetInfluences[ i ] != 0.0 ) vColor += getMorph( gl_VertexID, i, 2 ) * morphTargetInfluences[ i ];\n\t\t#elif defined( USE_COLOR )\n\t\t\tif ( morphTargetInfluences[ i ] != 0.0 ) vColor += getMorph( gl_VertexID, i, 2 ).rgb * morphTargetInfluences[ i ];\n\t\t#endif\n\t}\n#endif";


    var morphnormal_vertex = "#ifdef USE_MORPHNORMALS\n\tobjectNormal *= morphTargetBaseInfluence;\n\t#ifdef MORPHTARGETS_TEXTURE\n\t\tfor ( int i = 0; i < MORPHTARGETS_COUNT; i ++ ) {\n\t\t\tif ( morphTargetInfluences[ i ] != 0.0 ) objectNormal += getMorph( gl_VertexID, i, 1 ).xyz * morphTargetInfluences[ i ];\n\t\t}\n\t#else\n\t\tobjectNormal += morphNormal0 * morphTargetInfluences[ 0 ];\n\t\tobjectNormal += morphNormal1 * morphTargetInfluences[ 1 ];\n\t\tobjectNormal += morphNormal2 * morphTargetInfluences[ 2 ];\n\t\tobjectNormal += morphNormal3 * morphTargetInfluences[ 3 ];\n\t#endif\n#endif";


    var morphtarget_pars_vertex = "#ifdef USE_MORPHTARGETS\n\tuniform float morphTargetBaseInfluence;\n\t#ifdef MORPHTARGETS_TEXTURE\n\t\tuniform float morphTargetInfluences[ MORPHTARGETS_COUNT ];\n\t\tuniform sampler2DArray morphTargetsTexture;\n\t\tuniform ivec2 morphTargetsTextureSize;\n\t\tvec4 getMorph( const in int vertexIndex, const in int morphTargetIndex, const in int offset ) {\n\t\t\tint texelIndex = vertexIndex * MORPHTARGETS_TEXTURE_STRIDE + offset;\n\t\t\tint y = texelIndex / morphTargetsTextureSize.x;\n\t\t\tint x = texelIndex - y * morphTargetsTextureSize.x;\n\t\t\tivec3 morphUV = ivec3( x, y, morphTargetIndex );\n\t\t\treturn texelFetch( morphTargetsTexture, morphUV, 0 );\n\t\t}\n\t#else\n\t\t#ifndef USE_MORPHNORMALS\n\t\t\tuniform float morphTargetInfluences[ 8 ];\n\t\t#else\n\t\t\tuniform float morphTargetInfluences[ 4 ];\n\t\t#endif\n\t#endif\n#endif";


    var morphtarget_vertex = "#ifdef USE_MORPHTARGETS\n\ttransformed *= morphTargetBaseInfluence;\n\t#ifdef MORPHTARGETS_TEXTURE\n\t\tfor ( int i = 0; i < MORPHTARGETS_COUNT; i ++ ) {\n\t\t\tif ( morphTargetInfluences[ i ] != 0.0 ) transformed += getMorph( gl_VertexID, i, 0 ).xyz * morphTargetInfluences[ i ];\n\t\t}\n\t#else\n\t\ttransformed += morphTarget0 * morphTargetInfluences[ 0 ];\n\t\ttransformed += morphTarget1 * morphTargetInfluences[ 1 ];\n\t\ttransformed += morphTarget2 * morphTargetInfluences[ 2 ];\n\t\ttransformed += morphTarget3 * morphTargetInfluences[ 3 ];\n\t\t#ifndef USE_MORPHNORMALS\n\t\t\ttransformed += morphTarget4 * morphTargetInfluences[ 4 ];\n\t\t\ttransformed += morphTarget5 * morphTargetInfluences[ 5 ];\n\t\t\ttransformed += morphTarget6 * morphTargetInfluences[ 6 ];\n\t\t\ttransformed += morphTarget7 * morphTargetInfluences[ 7 ];\n\t\t#endif\n\t#endif\n#endif";


    var normal_fragment_begin = "float faceDirection = gl_FrontFacing ? 1.0 : - 1.0;\n#ifdef FLAT_SHADED\n\tvec3 fdx = dFdx( vViewPosition );\n\tvec3 fdy = dFdy( vViewPosition );\n\tvec3 normal = normalize( cross( fdx, fdy ) );\n#else\n\tvec3 normal = normalize( vNormal );\n\t#ifdef DOUBLE_SIDED\n\t\tnormal *= faceDirection;\n\t#endif\n#endif\n#if defined( USE_NORMALMAP_TANGENTSPACE ) || defined( USE_CLEARCOAT_NORMALMAP ) || defined( USE_ANISOTROPY )\n\t#ifdef USE_TANGENT\n\t\tmat3 tbn = mat3( normalize( vTangent ), normalize( vBitangent ), normal );\n\t#else\n\t\tmat3 tbn = getTangentFrame( - vViewPosition, normal,\n\t\t#if defined( USE_NORMALMAP )\n\t\t\tvNormalMapUv\n\t\t#elif defined( USE_CLEARCOAT_NORMALMAP )\n\t\t\tvClearcoatNormalMapUv\n\t\t#else\n\t\t\tvUv\n\t\t#endif\n\t\t);\n\t#endif\n\t#if defined( DOUBLE_SIDED ) && ! defined( FLAT_SHADED )\n\t\ttbn[0] *= faceDirection;\n\t\ttbn[1] *= faceDirection;\n\t#endif\n#endif\n#ifdef USE_CLEARCOAT_NORMALMAP\n\t#ifdef USE_TANGENT\n\t\tmat3 tbn2 = mat3( normalize( vTangent ), normalize( vBitangent ), normal );\n\t#else\n\t\tmat3 tbn2 = getTangentFrame( - vViewPosition, normal, vClearcoatNormalMapUv );\n\t#endif\n\t#if defined( DOUBLE_SIDED ) && ! defined( FLAT_SHADED )\n\t\ttbn2[0] *= faceDirection;\n\t\ttbn2[1] *= faceDirection;\n\t#endif\n#endif\nvec3 nonPerturbedNormal = normal;";


    var normal_fragment_maps = "#ifdef USE_NORMALMAP_OBJECTSPACE\n\tnormal = texture2D( normalMap, vNormalMapUv ).xyz * 2.0 - 1.0;\n\t#ifdef FLIP_SIDED\n\t\tnormal = - normal;\n\t#endif\n\t#ifdef DOUBLE_SIDED\n\t\tnormal = normal * faceDirection;\n\t#endif\n\tnormal = normalize( normalMatrix * normal );\n#elif defined( USE_NORMALMAP_TANGENTSPACE )\n\tvec3 mapN = texture2D( normalMap, vNormalMapUv ).xyz * 2.0 - 1.0;\n\tmapN.xy *= normalScale;\n\tnormal = normalize( tbn * mapN );\n#elif defined( USE_BUMPMAP )\n\tnormal = perturbNormalArb( - vViewPosition, normal, dHdxy_fwd(), faceDirection );\n#endif";


    var normal_pars_fragment = "#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n\t#ifdef USE_TANGENT\n\t\tvarying vec3 vTangent;\n\t\tvarying vec3 vBitangent;\n\t#endif\n#endif";


    var normal_pars_vertex = "#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n\t#ifdef USE_TANGENT\n\t\tvarying vec3 vTangent;\n\t\tvarying vec3 vBitangent;\n\t#endif\n#endif";


    var normal_vertex = "#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n\t#ifdef USE_TANGENT\n\t\tvTangent = normalize( transformedTangent );\n\t\tvBitangent = normalize( cross( vNormal, vTangent ) * tangent.w );\n\t#endif\n#endif";


    var normalmap_pars_fragment = "#ifdef USE_NORMALMAP\n\tuniform sampler2D normalMap;\n\tuniform vec2 normalScale;\n#endif\n#ifdef USE_NORMALMAP_OBJECTSPACE\n\tuniform mat3 normalMatrix;\n#endif\n#if ! defined ( USE_TANGENT ) && ( defined ( USE_NORMALMAP_TANGENTSPACE ) || defined ( USE_CLEARCOAT_NORMALMAP ) || defined( USE_ANISOTROPY ) )\n\tmat3 getTangentFrame( vec3 eye_pos, vec3 surf_norm, vec2 uv ) {\n\t\tvec3 q0 = dFdx( eye_pos.xyz );\n\t\tvec3 q1 = dFdy( eye_pos.xyz );\n\t\tvec2 st0 = dFdx( uv.st );\n\t\tvec2 st1 = dFdy( uv.st );\n\t\tvec3 N = surf_norm;\n\t\tvec3 q1perp = cross( q1, N );\n\t\tvec3 q0perp = cross( N, q0 );\n\t\tvec3 T = q1perp * st0.x + q0perp * st1.x;\n\t\tvec3 B = q1perp * st0.y + q0perp * st1.y;\n\t\tfloat det = max( dot( T, T ), dot( B, B ) );\n\t\tfloat scale = ( det == 0.0 ) ? 0.0 : inversesqrt( det );\n\t\treturn mat3( T * scale, B * scale, N );\n\t}\n#endif";


    var clearcoat_normal_fragment_begin = "#ifdef USE_CLEARCOAT\n\tvec3 clearcoatNormal = nonPerturbedNormal;\n#endif";


    var clearcoat_normal_fragment_maps = "#ifdef USE_CLEARCOAT_NORMALMAP\n\tvec3 clearcoatMapN = texture2D( clearcoatNormalMap, vClearcoatNormalMapUv ).xyz * 2.0 - 1.0;\n\tclearcoatMapN.xy *= clearcoatNormalScale;\n\tclearcoatNormal = normalize( tbn2 * clearcoatMapN );\n#endif";


    var clearcoat_pars_fragment = "#ifdef USE_CLEARCOATMAP\n\tuniform sampler2D clearcoatMap;\n#endif\n#ifdef USE_CLEARCOAT_NORMALMAP\n\tuniform sampler2D clearcoatNormalMap;\n\tuniform vec2 clearcoatNormalScale;\n#endif\n#ifdef USE_CLEARCOAT_ROUGHNESSMAP\n\tuniform sampler2D clearcoatRoughnessMap;\n#endif";


    var iridescence_pars_fragment = "#ifdef USE_IRIDESCENCEMAP\n\tuniform sampler2D iridescenceMap;\n#endif\n#ifdef USE_IRIDESCENCE_THICKNESSMAP\n\tuniform sampler2D iridescenceThicknessMap;\n#endif";


    var opaque_fragment = "#ifdef OPAQUE\ndiffuseColor.a = 1.0;\n#endif\n#ifdef USE_TRANSMISSION\ndiffuseColor.a *= material.transmissionAlpha;\n#endif\ngl_FragColor = vec4( outgoingLight, diffuseColor.a );";


    var packing = "vec3 packNormalToRGB( const in vec3 normal ) {\n\treturn normalize( normal ) * 0.5 + 0.5;\n}\nvec3 unpackRGBToNormal( const in vec3 rgb ) {\n\treturn 2.0 * rgb.xyz - 1.0;\n}\nconst float PackUpscale = 256. / 255.;const float UnpackDownscale = 255. / 256.;\nconst vec3 PackFactors = vec3( 256. * 256. * 256., 256. * 256., 256. );\nconst vec4 UnpackFactors = UnpackDownscale / vec4( PackFactors, 1. );\nconst float ShiftRight8 = 1. / 256.;\nvec4 packDepthToRGBA( const in float v ) {\n\tvec4 r = vec4( fract( v * PackFactors ), v );\n\tr.yzw -= r.xyz * ShiftRight8;\treturn r * PackUpscale;\n}\nfloat unpackRGBAToDepth( const in vec4 v ) {\n\treturn dot( v, UnpackFactors );\n}\nvec2 packDepthToRG( in highp float v ) {\n\treturn packDepthToRGBA( v ).yx;\n}\nfloat unpackRGToDepth( const in highp vec2 v ) {\n\treturn unpackRGBAToDepth( vec4( v.xy, 0.0, 0.0 ) );\n}\nvec4 pack2HalfToRGBA( vec2 v ) {\n\tvec4 r = vec4( v.x, fract( v.x * 255.0 ), v.y, fract( v.y * 255.0 ) );\n\treturn vec4( r.x - r.y / 255.0, r.y, r.z - r.w / 255.0, r.w );\n}\nvec2 unpackRGBATo2Half( vec4 v ) {\n\treturn vec2( v.x + ( v.y / 255.0 ), v.z + ( v.w / 255.0 ) );\n}\nfloat viewZToOrthographicDepth( const in float viewZ, const in float near, const in float far ) {\n\treturn ( viewZ + near ) / ( near - far );\n}\nfloat orthographicDepthToViewZ( const in float depth, const in float near, const in float far ) {\n\treturn depth * ( near - far ) - near;\n}\nfloat viewZToPerspectiveDepth( const in float viewZ, const in float near, const in float far ) {\n\treturn ( ( near + viewZ ) * far ) / ( ( far - near ) * viewZ );\n}\nfloat perspectiveDepthToViewZ( const in float depth, const in float near, const in float far ) {\n\treturn ( near * far ) / ( ( far - near ) * depth - far );\n}";


    var premultiplied_alpha_fragment = "#ifdef PREMULTIPLIED_ALPHA\n\tgl_FragColor.rgb *= gl_FragColor.a;\n#endif";


    var project_vertex = "vec4 mvPosition = vec4( transformed, 1.0 );\n#ifdef USE_BATCHING\n\tmvPosition = batchingMatrix * mvPosition;\n#endif\n#ifdef USE_INSTANCING\n\tmvPosition = instanceMatrix * mvPosition;\n#endif\nmvPosition = modelViewMatrix * mvPosition;\ngl_Position = projectionMatrix * mvPosition;";


    var dithering_fragment = "#ifdef DITHERING\n\tgl_FragColor.rgb = dithering( gl_FragColor.rgb );\n#endif";


    var dithering_pars_fragment = "#ifdef DITHERING\n\tvec3 dithering( vec3 color ) {\n\t\tfloat grid_position = rand( gl_FragCoord.xy );\n\t\tvec3 dither_shift_RGB = vec3( 0.25 / 255.0, -0.25 / 255.0, 0.25 / 255.0 );\n\t\tdither_shift_RGB = mix( 2.0 * dither_shift_RGB, -2.0 * dither_shift_RGB, grid_position );\n\t\treturn color + dither_shift_RGB;\n\t}\n#endif";


    var roughnessmap_fragment = "float roughnessFactor = roughness;\n#ifdef USE_ROUGHNESSMAP\n\tvec4 texelRoughness = texture2D( roughnessMap, vRoughnessMapUv );\n\troughnessFactor *= texelRoughness.g;\n#endif";


    var roughnessmap_pars_fragment = "#ifdef USE_ROUGHNESSMAP\n\tuniform sampler2D roughnessMap;\n#endif";


    var shadowmap_pars_fragment = "#if NUM_SPOT_LIGHT_COORDS > 0\n\tvarying vec4 vSpotLightCoord[ NUM_SPOT_LIGHT_COORDS ];\n#endif\n#if NUM_SPOT_LIGHT_MAPS > 0\n\tuniform sampler2D spotLightMap[ NUM_SPOT_LIGHT_MAPS ];\n#endif\n#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\t\tuniform sampler2D directionalShadowMap[ NUM_DIR_LIGHT_SHADOWS ];\n\t\tvarying vec4 vDirectionalShadowCoord[ NUM_DIR_LIGHT_SHADOWS ];\n\t\tstruct DirectionalLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t};\n\t\tuniform DirectionalLightShadow directionalLightShadows[ NUM_DIR_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\t\tuniform sampler2D spotShadowMap[ NUM_SPOT_LIGHT_SHADOWS ];\n\t\tstruct SpotLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t};\n\t\tuniform SpotLightShadow spotLightShadows[ NUM_SPOT_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\t\tuniform sampler2D pointShadowMap[ NUM_POINT_LIGHT_SHADOWS ];\n\t\tvarying vec4 vPointShadowCoord[ NUM_POINT_LIGHT_SHADOWS ];\n\t\tstruct PointLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t\tfloat shadowCameraNear;\n\t\t\tfloat shadowCameraFar;\n\t\t};\n\t\tuniform PointLightShadow pointLightShadows[ NUM_POINT_LIGHT_SHADOWS ];\n\t#endif\n\tfloat texture2DCompare( sampler2D depths, vec2 uv, float compare ) {\n\t\treturn step( compare, unpackRGBAToDepth( texture2D( depths, uv ) ) );\n\t}\n\tvec2 texture2DDistribution( sampler2D shadow, vec2 uv ) {\n\t\treturn unpackRGBATo2Half( texture2D( shadow, uv ) );\n\t}\n\tfloat VSMShadow (sampler2D shadow, vec2 uv, float compare ){\n\t\tfloat occlusion = 1.0;\n\t\tvec2 distribution = texture2DDistribution( shadow, uv );\n\t\tfloat hard_shadow = step( compare , distribution.x );\n\t\tif (hard_shadow != 1.0 ) {\n\t\t\tfloat distance = compare - distribution.x ;\n\t\t\tfloat variance = max( 0.00000, distribution.y * distribution.y );\n\t\t\tfloat softness_probability = variance / (variance + distance * distance );\t\t\tsoftness_probability = clamp( ( softness_probability - 0.3 ) / ( 0.95 - 0.3 ), 0.0, 1.0 );\t\t\tocclusion = clamp( max( hard_shadow, softness_probability ), 0.0, 1.0 );\n\t\t}\n\t\treturn occlusion;\n\t}\n\tfloat getShadow( sampler2D shadowMap, vec2 shadowMapSize, float shadowBias, float shadowRadius, vec4 shadowCoord ) {\n\t\tfloat shadow = 1.0;\n\t\tshadowCoord.xyz /= shadowCoord.w;\n\t\tshadowCoord.z += shadowBias;\n\t\tbool inFrustum = shadowCoord.x >= 0.0 && shadowCoord.x <= 1.0 && shadowCoord.y >= 0.0 && shadowCoord.y <= 1.0;\n\t\tbool frustumTest = inFrustum && shadowCoord.z <= 1.0;\n\t\tif ( frustumTest ) {\n\t\t#if defined( SHADOWMAP_TYPE_PCF )\n\t\t\tvec2 texelSize = vec2( 1.0 ) / shadowMapSize;\n\t\t\tfloat dx0 = - texelSize.x * shadowRadius;\n\t\t\tfloat dy0 = - texelSize.y * shadowRadius;\n\t\t\tfloat dx1 = + texelSize.x * shadowRadius;\n\t\t\tfloat dy1 = + texelSize.y * shadowRadius;\n\t\t\tfloat dx2 = dx0 / 2.0;\n\t\t\tfloat dy2 = dy0 / 2.0;\n\t\t\tfloat dx3 = dx1 / 2.0;\n\t\t\tfloat dy3 = dy1 / 2.0;\n\t\t\tshadow = (\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, dy2 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy2 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, dy2 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, dy3 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy3 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, dy3 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy1 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy1 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy1 ), shadowCoord.z )\n\t\t\t) * ( 1.0 / 17.0 );\n\t\t#elif defined( SHADOWMAP_TYPE_PCF_SOFT )\n\t\t\tvec2 texelSize = vec2( 1.0 ) / shadowMapSize;\n\t\t\tfloat dx = texelSize.x;\n\t\t\tfloat dy = texelSize.y;\n\t\t\tvec2 uv = shadowCoord.xy;\n\t\t\tvec2 f = fract( uv * shadowMapSize + 0.5 );\n\t\t\tuv -= f * texelSize;\n\t\t\tshadow = (\n\t\t\t\ttexture2DCompare( shadowMap, uv, shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, uv + vec2( dx, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, uv + vec2( 0.0, dy ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, uv + texelSize, shadowCoord.z ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( -dx, 0.0 ), shadowCoord.z ),\n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, 0.0 ), shadowCoord.z ),\n\t\t\t\t\t f.x ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( -dx, dy ), shadowCoord.z ),\n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, dy ), shadowCoord.z ),\n\t\t\t\t\t f.x ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( 0.0, -dy ), shadowCoord.z ),\n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( 0.0, 2.0 * dy ), shadowCoord.z ),\n\t\t\t\t\t f.y ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( dx, -dy ), shadowCoord.z ),\n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( dx, 2.0 * dy ), shadowCoord.z ),\n\t\t\t\t\t f.y ) +\n\t\t\t\tmix( mix( texture2DCompare( shadowMap, uv + vec2( -dx, -dy ), shadowCoord.z ),\n\t\t\t\t\t\t  texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, -dy ), shadowCoord.z ),\n\t\t\t\t\t\t  f.x ),\n\t\t\t\t\t mix( texture2DCompare( shadowMap, uv + vec2( -dx, 2.0 * dy ), shadowCoord.z ),\n\t\t\t\t\t\t  texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, 2.0 * dy ), shadowCoord.z ),\n\t\t\t\t\t\t  f.x ),\n\t\t\t\t\t f.y )\n\t\t\t) * ( 1.0 / 9.0 );\n\t\t#elif defined( SHADOWMAP_TYPE_VSM )\n\t\t\tshadow = VSMShadow( shadowMap, shadowCoord.xy, shadowCoord.z );\n\t\t#else\n\t\t\tshadow = texture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z );\n\t\t#endif\n\t\t}\n\t\treturn shadow;\n\t}\n\tvec2 cubeToUV( vec3 v, float texelSizeY ) {\n\t\tvec3 absV = abs( v );\n\t\tfloat scaleToCube = 1.0 / max( absV.x, max( absV.y, absV.z ) );\n\t\tabsV *= scaleToCube;\n\t\tv *= scaleToCube * ( 1.0 - 2.0 * texelSizeY );\n\t\tvec2 planar = v.xy;\n\t\tfloat almostATexel = 1.5 * texelSizeY;\n\t\tfloat almostOne = 1.0 - almostATexel;\n\t\tif ( absV.z >= almostOne ) {\n\t\t\tif ( v.z > 0.0 )\n\t\t\t\tplanar.x = 4.0 - v.x;\n\t\t} else if ( absV.x >= almostOne ) {\n\t\t\tfloat signX = sign( v.x );\n\t\t\tplanar.x = v.z * signX + 2.0 * signX;\n\t\t} else if ( absV.y >= almostOne ) {\n\t\t\tfloat signY = sign( v.y );\n\t\t\tplanar.x = v.x + 2.0 * signY + 2.0;\n\t\t\tplanar.y = v.z * signY - 2.0;\n\t\t}\n\t\treturn vec2( 0.125, 0.25 ) * planar + vec2( 0.375, 0.75 );\n\t}\n\tfloat getPointShadow( sampler2D shadowMap, vec2 shadowMapSize, float shadowBias, float shadowRadius, vec4 shadowCoord, float shadowCameraNear, float shadowCameraFar ) {\n\t\tvec2 texelSize = vec2( 1.0 ) / ( shadowMapSize * vec2( 4.0, 2.0 ) );\n\t\tvec3 lightToPosition = shadowCoord.xyz;\n\t\tfloat dp = ( length( lightToPosition ) - shadowCameraNear ) / ( shadowCameraFar - shadowCameraNear );\t\tdp += shadowBias;\n\t\tvec3 bd3D = normalize( lightToPosition );\n\t\t#if defined( SHADOWMAP_TYPE_PCF ) || defined( SHADOWMAP_TYPE_PCF_SOFT ) || defined( SHADOWMAP_TYPE_VSM )\n\t\t\tvec2 offset = vec2( - 1, 1 ) * shadowRadius * texelSize.y;\n\t\t\treturn (\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xyy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yyy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xyx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yyx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xxy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yxy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xxx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yxx, texelSize.y ), dp )\n\t\t\t) * ( 1.0 / 9.0 );\n\t\t#else\n\t\t\treturn texture2DCompare( shadowMap, cubeToUV( bd3D, texelSize.y ), dp );\n\t\t#endif\n\t}\n#endif";


    var shadowmap_pars_vertex = "#if NUM_SPOT_LIGHT_COORDS > 0\n\tuniform mat4 spotLightMatrix[ NUM_SPOT_LIGHT_COORDS ];\n\tvarying vec4 vSpotLightCoord[ NUM_SPOT_LIGHT_COORDS ];\n#endif\n#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\t\tuniform mat4 directionalShadowMatrix[ NUM_DIR_LIGHT_SHADOWS ];\n\t\tvarying vec4 vDirectionalShadowCoord[ NUM_DIR_LIGHT_SHADOWS ];\n\t\tstruct DirectionalLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t};\n\t\tuniform DirectionalLightShadow directionalLightShadows[ NUM_DIR_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\t\tstruct SpotLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t};\n\t\tuniform SpotLightShadow spotLightShadows[ NUM_SPOT_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\t\tuniform mat4 pointShadowMatrix[ NUM_POINT_LIGHT_SHADOWS ];\n\t\tvarying vec4 vPointShadowCoord[ NUM_POINT_LIGHT_SHADOWS ];\n\t\tstruct PointLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowNormalBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t\tfloat shadowCameraNear;\n\t\t\tfloat shadowCameraFar;\n\t\t};\n\t\tuniform PointLightShadow pointLightShadows[ NUM_POINT_LIGHT_SHADOWS ];\n\t#endif\n#endif";


    var shadowmap_vertex = "#if ( defined( USE_SHADOWMAP ) && ( NUM_DIR_LIGHT_SHADOWS > 0 || NUM_POINT_LIGHT_SHADOWS > 0 ) ) || ( NUM_SPOT_LIGHT_COORDS > 0 )\n\tvec3 shadowWorldNormal = inverseTransformDirection( transformedNormal, viewMatrix );\n\tvec4 shadowWorldPosition;\n#endif\n#if defined( USE_SHADOWMAP )\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\t\t#pragma unroll_loop_start\n\t\tfor ( int i = 0; i < NUM_DIR_LIGHT_SHADOWS; i ++ ) {\n\t\t\tshadowWorldPosition = worldPosition + vec4( shadowWorldNormal * directionalLightShadows[ i ].shadowNormalBias, 0 );\n\t\t\tvDirectionalShadowCoord[ i ] = directionalShadowMatrix[ i ] * shadowWorldPosition;\n\t\t}\n\t\t#pragma unroll_loop_end\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\t\t#pragma unroll_loop_start\n\t\tfor ( int i = 0; i < NUM_POINT_LIGHT_SHADOWS; i ++ ) {\n\t\t\tshadowWorldPosition = worldPosition + vec4( shadowWorldNormal * pointLightShadows[ i ].shadowNormalBias, 0 );\n\t\t\tvPointShadowCoord[ i ] = pointShadowMatrix[ i ] * shadowWorldPosition;\n\t\t}\n\t\t#pragma unroll_loop_end\n\t#endif\n#endif\n#if NUM_SPOT_LIGHT_COORDS > 0\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_SPOT_LIGHT_COORDS; i ++ ) {\n\t\tshadowWorldPosition = worldPosition;\n\t\t#if ( defined( USE_SHADOWMAP ) && UNROLLED_LOOP_INDEX < NUM_SPOT_LIGHT_SHADOWS )\n\t\t\tshadowWorldPosition.xyz += shadowWorldNormal * spotLightShadows[ i ].shadowNormalBias;\n\t\t#endif\n\t\tvSpotLightCoord[ i ] = spotLightMatrix[ i ] * shadowWorldPosition;\n\t}\n\t#pragma unroll_loop_end\n#endif";


    var shadowmask_pars_fragment = "float getShadowMask() {\n\tfloat shadow = 1.0;\n\t#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\tDirectionalLightShadow directionalLight;\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_DIR_LIGHT_SHADOWS; i ++ ) {\n\t\tdirectionalLight = directionalLightShadows[ i ];\n\t\tshadow *= receiveShadow ? getShadow( directionalShadowMap[ i ], directionalLight.shadowMapSize, directionalLight.shadowBias, directionalLight.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;\n\t}\n\t#pragma unroll_loop_end\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\tSpotLightShadow spotLight;\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_SPOT_LIGHT_SHADOWS; i ++ ) {\n\t\tspotLight = spotLightShadows[ i ];\n\t\tshadow *= receiveShadow ? getShadow( spotShadowMap[ i ], spotLight.shadowMapSize, spotLight.shadowBias, spotLight.shadowRadius, vSpotLightCoord[ i ] ) : 1.0;\n\t}\n\t#pragma unroll_loop_end\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\tPointLightShadow pointLight;\n\t#pragma unroll_loop_start\n\tfor ( int i = 0; i < NUM_POINT_LIGHT_SHADOWS; i ++ ) {\n\t\tpointLight = pointLightShadows[ i ];\n\t\tshadow *= receiveShadow ? getPointShadow( pointShadowMap[ i ], pointLight.shadowMapSize, pointLight.shadowBias, pointLight.shadowRadius, vPointShadowCoord[ i ], pointLight.shadowCameraNear, pointLight.shadowCameraFar ) : 1.0;\n\t}\n\t#pragma unroll_loop_end\n\t#endif\n\t#endif\n\treturn shadow;\n}";


    var skinbase_vertex = "#ifdef USE_SKINNING\n\tmat4 boneMatX = getBoneMatrix( skinIndex.x );\n\tmat4 boneMatY = getBoneMatrix( skinIndex.y );\n\tmat4 boneMatZ = getBoneMatrix( skinIndex.z );\n\tmat4 boneMatW = getBoneMatrix( skinIndex.w );\n#endif";


    var skinning_pars_vertex = "#ifdef USE_SKINNING\n\tuniform mat4 bindMatrix;\n\tuniform mat4 bindMatrixInverse;\n\tuniform highp sampler2D boneTexture;\n\tmat4 getBoneMatrix( const in float i ) {\n\t\tint size = textureSize( boneTexture, 0 ).x;\n\t\tint j = int( i ) * 4;\n\t\tint x = j % size;\n\t\tint y = j / size;\n\t\tvec4 v1 = texelFetch( boneTexture, ivec2( x, y ), 0 );\n\t\tvec4 v2 = texelFetch( boneTexture, ivec2( x + 1, y ), 0 );\n\t\tvec4 v3 = texelFetch( boneTexture, ivec2( x + 2, y ), 0 );\n\t\tvec4 v4 = texelFetch( boneTexture, ivec2( x + 3, y ), 0 );\n\t\treturn mat4( v1, v2, v3, v4 );\n\t}\n#endif";


    var skinning_vertex = "#ifdef USE_SKINNING\n\tvec4 skinVertex = bindMatrix * vec4( transformed, 1.0 );\n\tvec4 skinned = vec4( 0.0 );\n\tskinned += boneMatX * skinVertex * skinWeight.x;\n\tskinned += boneMatY * skinVertex * skinWeight.y;\n\tskinned += boneMatZ * skinVertex * skinWeight.z;\n\tskinned += boneMatW * skinVertex * skinWeight.w;\n\ttransformed = ( bindMatrixInverse * skinned ).xyz;\n#endif";


    var skinnormal_vertex = "#ifdef USE_SKINNING\n\tmat4 skinMatrix = mat4( 0.0 );\n\tskinMatrix += skinWeight.x * boneMatX;\n\tskinMatrix += skinWeight.y * boneMatY;\n\tskinMatrix += skinWeight.z * boneMatZ;\n\tskinMatrix += skinWeight.w * boneMatW;\n\tskinMatrix = bindMatrixInverse * skinMatrix * bindMatrix;\n\tobjectNormal = vec4( skinMatrix * vec4( objectNormal, 0.0 ) ).xyz;\n\t#ifdef USE_TANGENT\n\t\tobjectTangent = vec4( skinMatrix * vec4( objectTangent, 0.0 ) ).xyz;\n\t#endif\n#endif";


    var specularmap_fragment = "float specularStrength;\n#ifdef USE_SPECULARMAP\n\tvec4 texelSpecular = texture2D( specularMap, vSpecularMapUv );\n\tspecularStrength = texelSpecular.r;\n#else\n\tspecularStrength = 1.0;\n#endif";


    var specularmap_pars_fragment = "#ifdef USE_SPECULARMAP\n\tuniform sampler2D specularMap;\n#endif";


    var tonemapping_fragment = "#if defined( TONE_MAPPING )\n\tgl_FragColor.rgb = toneMapping( gl_FragColor.rgb );\n#endif";


    var tonemapping_pars_fragment = "#ifndef saturate\n#define saturate( a ) clamp( a, 0.0, 1.0 )\n#endif\nuniform float toneMappingExposure;\nvec3 LinearToneMapping( vec3 color ) {\n\treturn saturate( toneMappingExposure * color );\n}\nvec3 ReinhardToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\treturn saturate( color / ( vec3( 1.0 ) + color ) );\n}\nvec3 OptimizedCineonToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\tcolor = max( vec3( 0.0 ), color - 0.004 );\n\treturn pow( ( color * ( 6.2 * color + 0.5 ) ) / ( color * ( 6.2 * color + 1.7 ) + 0.06 ), vec3( 2.2 ) );\n}\nvec3 RRTAndODTFit( vec3 v ) {\n\tvec3 a = v * ( v + 0.0245786 ) - 0.000090537;\n\tvec3 b = v * ( 0.983729 * v + 0.4329510 ) + 0.238081;\n\treturn a / b;\n}\nvec3 ACESFilmicToneMapping( vec3 color ) {\n\tconst mat3 ACESInputMat = mat3(\n\t\tvec3( 0.59719, 0.07600, 0.02840 ),\t\tvec3( 0.35458, 0.90834, 0.13383 ),\n\t\tvec3( 0.04823, 0.01566, 0.83777 )\n\t);\n\tconst mat3 ACESOutputMat = mat3(\n\t\tvec3(  1.60475, -0.10208, -0.00327 ),\t\tvec3( -0.53108,  1.10813, -0.07276 ),\n\t\tvec3( -0.07367, -0.00605,  1.07602 )\n\t);\n\tcolor *= toneMappingExposure / 0.6;\n\tcolor = ACESInputMat * color;\n\tcolor = RRTAndODTFit( color );\n\tcolor = ACESOutputMat * color;\n\treturn saturate( color );\n}\nconst mat3 LINEAR_REC2020_TO_LINEAR_SRGB = mat3(\n\tvec3( 1.6605, - 0.1246, - 0.0182 ),\n\tvec3( - 0.5876, 1.1329, - 0.1006 ),\n\tvec3( - 0.0728, - 0.0083, 1.1187 )\n);\nconst mat3 LINEAR_SRGB_TO_LINEAR_REC2020 = mat3(\n\tvec3( 0.6274, 0.0691, 0.0164 ),\n\tvec3( 0.3293, 0.9195, 0.0880 ),\n\tvec3( 0.0433, 0.0113, 0.8956 )\n);\nvec3 agxDefaultContrastApprox( vec3 x ) {\n\tvec3 x2 = x * x;\n\tvec3 x4 = x2 * x2;\n\treturn + 15.5 * x4 * x2\n\t\t- 40.14 * x4 * x\n\t\t+ 31.96 * x4\n\t\t- 6.868 * x2 * x\n\t\t+ 0.4298 * x2\n\t\t+ 0.1191 * x\n\t\t- 0.00232;\n}\nvec3 AgXToneMapping( vec3 color ) {\n\tconst mat3 AgXInsetMatrix = mat3(\n\t\tvec3( 0.856627153315983, 0.137318972929847, 0.11189821299995 ),\n\t\tvec3( 0.0951212405381588, 0.761241990602591, 0.0767994186031903 ),\n\t\tvec3( 0.0482516061458583, 0.101439036467562, 0.811302368396859 )\n\t);\n\tconst mat3 AgXOutsetMatrix = mat3(\n\t\tvec3( 1.1271005818144368, - 0.1413297634984383, - 0.14132976349843826 ),\n\t\tvec3( - 0.11060664309660323, 1.157823702216272, - 0.11060664309660294 ),\n\t\tvec3( - 0.016493938717834573, - 0.016493938717834257, 1.2519364065950405 )\n\t);\n\tconst float AgxMinEv = - 12.47393;\tconst float AgxMaxEv = 4.026069;\n\tcolor = LINEAR_SRGB_TO_LINEAR_REC2020 * color;\n\tcolor *= toneMappingExposure;\n\tcolor = AgXInsetMatrix * color;\n\tcolor = max( color, 1e-10 );\tcolor = log2( color );\n\tcolor = ( color - AgxMinEv ) / ( AgxMaxEv - AgxMinEv );\n\tcolor = clamp( color, 0.0, 1.0 );\n\tcolor = agxDefaultContrastApprox( color );\n\tcolor = AgXOutsetMatrix * color;\n\tcolor = pow( max( vec3( 0.0 ), color ), vec3( 2.2 ) );\n\tcolor = LINEAR_REC2020_TO_LINEAR_SRGB * color;\n\treturn color;\n}\nvec3 CustomToneMapping( vec3 color ) { return color; }";


    var transmission_fragment = "#ifdef USE_TRANSMISSION\n\tmaterial.transmission = transmission;\n\tmaterial.transmissionAlpha = 1.0;\n\tmaterial.thickness = thickness;\n\tmaterial.attenuationDistance = attenuationDistance;\n\tmaterial.attenuationColor = attenuationColor;\n\t#ifdef USE_TRANSMISSIONMAP\n\t\tmaterial.transmission *= texture2D( transmissionMap, vTransmissionMapUv ).r;\n\t#endif\n\t#ifdef USE_THICKNESSMAP\n\t\tmaterial.thickness *= texture2D( thicknessMap, vThicknessMapUv ).g;\n\t#endif\n\tvec3 pos = vWorldPosition;\n\tvec3 v = normalize( cameraPosition - pos );\n\tvec3 n = inverseTransformDirection( normal, viewMatrix );\n\tvec4 transmitted = getIBLVolumeRefraction(\n\t\tn, v, material.roughness, material.diffuseColor, material.specularColor, material.specularF90,\n\t\tpos, modelMatrix, viewMatrix, projectionMatrix, material.ior, material.thickness,\n\t\tmaterial.attenuationColor, material.attenuationDistance );\n\tmaterial.transmissionAlpha = mix( material.transmissionAlpha, transmitted.a, material.transmission );\n\ttotalDiffuse = mix( totalDiffuse, transmitted.rgb, material.transmission );\n#endif";


    var transmission_pars_fragment = "#ifdef USE_TRANSMISSION\n\tuniform float transmission;\n\tuniform float thickness;\n\tuniform float attenuationDistance;\n\tuniform vec3 attenuationColor;\n\t#ifdef USE_TRANSMISSIONMAP\n\t\tuniform sampler2D transmissionMap;\n\t#endif\n\t#ifdef USE_THICKNESSMAP\n\t\tuniform sampler2D thicknessMap;\n\t#endif\n\tuniform vec2 transmissionSamplerSize;\n\tuniform sampler2D transmissionSamplerMap;\n\tuniform mat4 modelMatrix;\n\tuniform mat4 projectionMatrix;\n\tvarying vec3 vWorldPosition;\n\tfloat w0( float a ) {\n\t\treturn ( 1.0 / 6.0 ) * ( a * ( a * ( - a + 3.0 ) - 3.0 ) + 1.0 );\n\t}\n\tfloat w1( float a ) {\n\t\treturn ( 1.0 / 6.0 ) * ( a *  a * ( 3.0 * a - 6.0 ) + 4.0 );\n\t}\n\tfloat w2( float a ){\n\t\treturn ( 1.0 / 6.0 ) * ( a * ( a * ( - 3.0 * a + 3.0 ) + 3.0 ) + 1.0 );\n\t}\n\tfloat w3( float a ) {\n\t\treturn ( 1.0 / 6.0 ) * ( a * a * a );\n\t}\n\tfloat g0( float a ) {\n\t\treturn w0( a ) + w1( a );\n\t}\n\tfloat g1( float a ) {\n\t\treturn w2( a ) + w3( a );\n\t}\n\tfloat h0( float a ) {\n\t\treturn - 1.0 + w1( a ) / ( w0( a ) + w1( a ) );\n\t}\n\tfloat h1( float a ) {\n\t\treturn 1.0 + w3( a ) / ( w2( a ) + w3( a ) );\n\t}\n\tvec4 bicubic( sampler2D tex, vec2 uv, vec4 texelSize, float lod ) {\n\t\tuv = uv * texelSize.zw + 0.5;\n\t\tvec2 iuv = floor( uv );\n\t\tvec2 fuv = fract( uv );\n\t\tfloat g0x = g0( fuv.x );\n\t\tfloat g1x = g1( fuv.x );\n\t\tfloat h0x = h0( fuv.x );\n\t\tfloat h1x = h1( fuv.x );\n\t\tfloat h0y = h0( fuv.y );\n\t\tfloat h1y = h1( fuv.y );\n\t\tvec2 p0 = ( vec2( iuv.x + h0x, iuv.y + h0y ) - 0.5 ) * texelSize.xy;\n\t\tvec2 p1 = ( vec2( iuv.x + h1x, iuv.y + h0y ) - 0.5 ) * texelSize.xy;\n\t\tvec2 p2 = ( vec2( iuv.x + h0x, iuv.y + h1y ) - 0.5 ) * texelSize.xy;\n\t\tvec2 p3 = ( vec2( iuv.x + h1x, iuv.y + h1y ) - 0.5 ) * texelSize.xy;\n\t\treturn g0( fuv.y ) * ( g0x * textureLod( tex, p0, lod ) + g1x * textureLod( tex, p1, lod ) ) +\n\t\t\tg1( fuv.y ) * ( g0x * textureLod( tex, p2, lod ) + g1x * textureLod( tex, p3, lod ) );\n\t}\n\tvec4 textureBicubic( sampler2D sampler, vec2 uv, float lod ) {\n\t\tvec2 fLodSize = vec2( textureSize( sampler, int( lod ) ) );\n\t\tvec2 cLodSize = vec2( textureSize( sampler, int( lod + 1.0 ) ) );\n\t\tvec2 fLodSizeInv = 1.0 / fLodSize;\n\t\tvec2 cLodSizeInv = 1.0 / cLodSize;\n\t\tvec4 fSample = bicubic( sampler, uv, vec4( fLodSizeInv, fLodSize ), floor( lod ) );\n\t\tvec4 cSample = bicubic( sampler, uv, vec4( cLodSizeInv, cLodSize ), ceil( lod ) );\n\t\treturn mix( fSample, cSample, fract( lod ) );\n\t}\n\tvec3 getVolumeTransmissionRay( const in vec3 n, const in vec3 v, const in float thickness, const in float ior, const in mat4 modelMatrix ) {\n\t\tvec3 refractionVector = refract( - v, normalize( n ), 1.0 / ior );\n\t\tvec3 modelScale;\n\t\tmodelScale.x = length( vec3( modelMatrix[ 0 ].xyz ) );\n\t\tmodelScale.y = length( vec3( modelMatrix[ 1 ].xyz ) );\n\t\tmodelScale.z = length( vec3( modelMatrix[ 2 ].xyz ) );\n\t\treturn normalize( refractionVector ) * thickness * modelScale;\n\t}\n\tfloat applyIorToRoughness( const in float roughness, const in float ior ) {\n\t\treturn roughness * clamp( ior * 2.0 - 2.0, 0.0, 1.0 );\n\t}\n\tvec4 getTransmissionSample( const in vec2 fragCoord, const in float roughness, const in float ior ) {\n\t\tfloat lod = log2( transmissionSamplerSize.x ) * applyIorToRoughness( roughness, ior );\n\t\treturn textureBicubic( transmissionSamplerMap, fragCoord.xy, lod );\n\t}\n\tvec3 volumeAttenuation( const in float transmissionDistance, const in vec3 attenuationColor, const in float attenuationDistance ) {\n\t\tif ( isinf( attenuationDistance ) ) {\n\t\t\treturn vec3( 1.0 );\n\t\t} else {\n\t\t\tvec3 attenuationCoefficient = -log( attenuationColor ) / attenuationDistance;\n\t\t\tvec3 transmittance = exp( - attenuationCoefficient * transmissionDistance );\t\t\treturn transmittance;\n\t\t}\n\t}\n\tvec4 getIBLVolumeRefraction( const in vec3 n, const in vec3 v, const in float roughness, const in vec3 diffuseColor,\n\t\tconst in vec3 specularColor, const in float specularF90, const in vec3 position, const in mat4 modelMatrix,\n\t\tconst in mat4 viewMatrix, const in mat4 projMatrix, const in float ior, const in float thickness,\n\t\tconst in vec3 attenuationColor, const in float attenuationDistance ) {\n\t\tvec3 transmissionRay = getVolumeTransmissionRay( n, v, thickness, ior, modelMatrix );\n\t\tvec3 refractedRayExit = position + transmissionRay;\n\t\tvec4 ndcPos = projMatrix * viewMatrix * vec4( refractedRayExit, 1.0 );\n\t\tvec2 refractionCoords = ndcPos.xy / ndcPos.w;\n\t\trefractionCoords += 1.0;\n\t\trefractionCoords /= 2.0;\n\t\tvec4 transmittedLight = getTransmissionSample( refractionCoords, roughness, ior );\n\t\tvec3 transmittance = diffuseColor * volumeAttenuation( length( transmissionRay ), attenuationColor, attenuationDistance );\n\t\tvec3 attenuatedColor = transmittance * transmittedLight.rgb;\n\t\tvec3 F = EnvironmentBRDF( n, v, specularColor, specularF90, roughness );\n\t\tfloat transmittanceFactor = ( transmittance.r + transmittance.g + transmittance.b ) / 3.0;\n\t\treturn vec4( ( 1.0 - F ) * attenuatedColor, 1.0 - ( 1.0 - transmittedLight.a ) * transmittanceFactor );\n\t}\n#endif";


    var uv_pars_fragment = "#if defined( USE_UV ) || defined( USE_ANISOTROPY )\n\tvarying vec2 vUv;\n#endif\n#ifdef USE_MAP\n\tvarying vec2 vMapUv;\n#endif\n#ifdef USE_ALPHAMAP\n\tvarying vec2 vAlphaMapUv;\n#endif\n#ifdef USE_LIGHTMAP\n\tvarying vec2 vLightMapUv;\n#endif\n#ifdef USE_AOMAP\n\tvarying vec2 vAoMapUv;\n#endif\n#ifdef USE_BUMPMAP\n\tvarying vec2 vBumpMapUv;\n#endif\n#ifdef USE_NORMALMAP\n\tvarying vec2 vNormalMapUv;\n#endif\n#ifdef USE_EMISSIVEMAP\n\tvarying vec2 vEmissiveMapUv;\n#endif\n#ifdef USE_METALNESSMAP\n\tvarying vec2 vMetalnessMapUv;\n#endif\n#ifdef USE_ROUGHNESSMAP\n\tvarying vec2 vRoughnessMapUv;\n#endif\n#ifdef USE_ANISOTROPYMAP\n\tvarying vec2 vAnisotropyMapUv;\n#endif\n#ifdef USE_CLEARCOATMAP\n\tvarying vec2 vClearcoatMapUv;\n#endif\n#ifdef USE_CLEARCOAT_NORMALMAP\n\tvarying vec2 vClearcoatNormalMapUv;\n#endif\n#ifdef USE_CLEARCOAT_ROUGHNESSMAP\n\tvarying vec2 vClearcoatRoughnessMapUv;\n#endif\n#ifdef USE_IRIDESCENCEMAP\n\tvarying vec2 vIridescenceMapUv;\n#endif\n#ifdef USE_IRIDESCENCE_THICKNESSMAP\n\tvarying vec2 vIridescenceThicknessMapUv;\n#endif\n#ifdef USE_SHEEN_COLORMAP\n\tvarying vec2 vSheenColorMapUv;\n#endif\n#ifdef USE_SHEEN_ROUGHNESSMAP\n\tvarying vec2 vSheenRoughnessMapUv;\n#endif\n#ifdef USE_SPECULARMAP\n\tvarying vec2 vSpecularMapUv;\n#endif\n#ifdef USE_SPECULAR_COLORMAP\n\tvarying vec2 vSpecularColorMapUv;\n#endif\n#ifdef USE_SPECULAR_INTENSITYMAP\n\tvarying vec2 vSpecularIntensityMapUv;\n#endif\n#ifdef USE_TRANSMISSIONMAP\n\tuniform mat3 transmissionMapTransform;\n\tvarying vec2 vTransmissionMapUv;\n#endif\n#ifdef USE_THICKNESSMAP\n\tuniform mat3 thicknessMapTransform;\n\tvarying vec2 vThicknessMapUv;\n#endif";


    var uv_pars_vertex = "#if defined( USE_UV ) || defined( USE_ANISOTROPY )\n\tvarying vec2 vUv;\n#endif\n#ifdef USE_MAP\n\tuniform mat3 mapTransform;\n\tvarying vec2 vMapUv;\n#endif\n#ifdef USE_ALPHAMAP\n\tuniform mat3 alphaMapTransform;\n\tvarying vec2 vAlphaMapUv;\n#endif\n#ifdef USE_LIGHTMAP\n\tuniform mat3 lightMapTransform;\n\tvarying vec2 vLightMapUv;\n#endif\n#ifdef USE_AOMAP\n\tuniform mat3 aoMapTransform;\n\tvarying vec2 vAoMapUv;\n#endif\n#ifdef USE_BUMPMAP\n\tuniform mat3 bumpMapTransform;\n\tvarying vec2 vBumpMapUv;\n#endif\n#ifdef USE_NORMALMAP\n\tuniform mat3 normalMapTransform;\n\tvarying vec2 vNormalMapUv;\n#endif\n#ifdef USE_DISPLACEMENTMAP\n\tuniform mat3 displacementMapTransform;\n\tvarying vec2 vDisplacementMapUv;\n#endif\n#ifdef USE_EMISSIVEMAP\n\tuniform mat3 emissiveMapTransform;\n\tvarying vec2 vEmissiveMapUv;\n#endif\n#ifdef USE_METALNESSMAP\n\tuniform mat3 metalnessMapTransform;\n\tvarying vec2 vMetalnessMapUv;\n#endif\n#ifdef USE_ROUGHNESSMAP\n\tuniform mat3 roughnessMapTransform;\n\tvarying vec2 vRoughnessMapUv;\n#endif\n#ifdef USE_ANISOTROPYMAP\n\tuniform mat3 anisotropyMapTransform;\n\tvarying vec2 vAnisotropyMapUv;\n#endif\n#ifdef USE_CLEARCOATMAP\n\tuniform mat3 clearcoatMapTransform;\n\tvarying vec2 vClearcoatMapUv;\n#endif\n#ifdef USE_CLEARCOAT_NORMALMAP\n\tuniform mat3 clearcoatNormalMapTransform;\n\tvarying vec2 vClearcoatNormalMapUv;\n#endif\n#ifdef USE_CLEARCOAT_ROUGHNESSMAP\n\tuniform mat3 clearcoatRoughnessMapTransform;\n\tvarying vec2 vClearcoatRoughnessMapUv;\n#endif\n#ifdef USE_SHEEN_COLORMAP\n\tuniform mat3 sheenColorMapTransform;\n\tvarying vec2 vSheenColorMapUv;\n#endif\n#ifdef USE_SHEEN_ROUGHNESSMAP\n\tuniform mat3 sheenRoughnessMapTransform;\n\tvarying vec2 vSheenRoughnessMapUv;\n#endif\n#ifdef USE_IRIDESCENCEMAP\n\tuniform mat3 iridescenceMapTransform;\n\tvarying vec2 vIridescenceMapUv;\n#endif\n#ifdef USE_IRIDESCENCE_THICKNESSMAP\n\tuniform mat3 iridescenceThicknessMapTransform;\n\tvarying vec2 vIridescenceThicknessMapUv;\n#endif\n#ifdef USE_SPECULARMAP\n\tuniform mat3 specularMapTransform;\n\tvarying vec2 vSpecularMapUv;\n#endif\n#ifdef USE_SPECULAR_COLORMAP\n\tuniform mat3 specularColorMapTransform;\n\tvarying vec2 vSpecularColorMapUv;\n#endif\n#ifdef USE_SPECULAR_INTENSITYMAP\n\tuniform mat3 specularIntensityMapTransform;\n\tvarying vec2 vSpecularIntensityMapUv;\n#endif\n#ifdef USE_TRANSMISSIONMAP\n\tuniform mat3 transmissionMapTransform;\n\tvarying vec2 vTransmissionMapUv;\n#endif\n#ifdef USE_THICKNESSMAP\n\tuniform mat3 thicknessMapTransform;\n\tvarying vec2 vThicknessMapUv;\n#endif";


    var uv_vertex = "#if defined( USE_UV ) || defined( USE_ANISOTROPY )\n\tvUv = vec3( uv, 1 ).xy;\n#endif\n#ifdef USE_MAP\n\tvMapUv = ( mapTransform * vec3( MAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_ALPHAMAP\n\tvAlphaMapUv = ( alphaMapTransform * vec3( ALPHAMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_LIGHTMAP\n\tvLightMapUv = ( lightMapTransform * vec3( LIGHTMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_AOMAP\n\tvAoMapUv = ( aoMapTransform * vec3( AOMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_BUMPMAP\n\tvBumpMapUv = ( bumpMapTransform * vec3( BUMPMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_NORMALMAP\n\tvNormalMapUv = ( normalMapTransform * vec3( NORMALMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_DISPLACEMENTMAP\n\tvDisplacementMapUv = ( displacementMapTransform * vec3( DISPLACEMENTMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_EMISSIVEMAP\n\tvEmissiveMapUv = ( emissiveMapTransform * vec3( EMISSIVEMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_METALNESSMAP\n\tvMetalnessMapUv = ( metalnessMapTransform * vec3( METALNESSMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_ROUGHNESSMAP\n\tvRoughnessMapUv = ( roughnessMapTransform * vec3( ROUGHNESSMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_ANISOTROPYMAP\n\tvAnisotropyMapUv = ( anisotropyMapTransform * vec3( ANISOTROPYMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_CLEARCOATMAP\n\tvClearcoatMapUv = ( clearcoatMapTransform * vec3( CLEARCOATMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_CLEARCOAT_NORMALMAP\n\tvClearcoatNormalMapUv = ( clearcoatNormalMapTransform * vec3( CLEARCOAT_NORMALMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_CLEARCOAT_ROUGHNESSMAP\n\tvClearcoatRoughnessMapUv = ( clearcoatRoughnessMapTransform * vec3( CLEARCOAT_ROUGHNESSMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_IRIDESCENCEMAP\n\tvIridescenceMapUv = ( iridescenceMapTransform * vec3( IRIDESCENCEMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_IRIDESCENCE_THICKNESSMAP\n\tvIridescenceThicknessMapUv = ( iridescenceThicknessMapTransform * vec3( IRIDESCENCE_THICKNESSMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_SHEEN_COLORMAP\n\tvSheenColorMapUv = ( sheenColorMapTransform * vec3( SHEEN_COLORMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_SHEEN_ROUGHNESSMAP\n\tvSheenRoughnessMapUv = ( sheenRoughnessMapTransform * vec3( SHEEN_ROUGHNESSMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_SPECULARMAP\n\tvSpecularMapUv = ( specularMapTransform * vec3( SPECULARMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_SPECULAR_COLORMAP\n\tvSpecularColorMapUv = ( specularColorMapTransform * vec3( SPECULAR_COLORMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_SPECULAR_INTENSITYMAP\n\tvSpecularIntensityMapUv = ( specularIntensityMapTransform * vec3( SPECULAR_INTENSITYMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_TRANSMISSIONMAP\n\tvTransmissionMapUv = ( transmissionMapTransform * vec3( TRANSMISSIONMAP_UV, 1 ) ).xy;\n#endif\n#ifdef USE_THICKNESSMAP\n\tvThicknessMapUv = ( thicknessMapTransform * vec3( THICKNESSMAP_UV, 1 ) ).xy;\n#endif";


    var worldpos_vertex = "#if defined( USE_ENVMAP ) || defined( DISTANCE ) || defined ( USE_SHADOWMAP ) || defined ( USE_TRANSMISSION ) || NUM_SPOT_LIGHT_COORDS > 0\n\tvec4 worldPosition = vec4( transformed, 1.0 );\n\t#ifdef USE_BATCHING\n\t\tworldPosition = batchingMatrix * worldPosition;\n\t#endif\n\t#ifdef USE_INSTANCING\n\t\tworldPosition = instanceMatrix * worldPosition;\n\t#endif\n\tworldPosition = modelMatrix * worldPosition;\n#endif";


    const vertex$h = "varying vec2 vUv;\nuniform mat3 uvTransform;\nvoid main() {\n\tvUv = ( uvTransform * vec3( uv, 1 ) ).xy;\n\tgl_Position = vec4( position.xy, 1.0, 1.0 );\n}";


    const fragment$h = "uniform sampler2D t2D;\nuniform float backgroundIntensity;\nvarying vec2 vUv;\nvoid main() {\n\tvec4 texColor = texture2D( t2D, vUv );\n\t#ifdef DECODE_VIDEO_TEXTURE\n\t\ttexColor = vec4( mix( pow( texColor.rgb * 0.9478672986 + vec3( 0.0521327014 ), vec3( 2.4 ) ), texColor.rgb * 0.0773993808, vec3( lessThanEqual( texColor.rgb, vec3( 0.04045 ) ) ) ), texColor.w );\n\t#endif\n\ttexColor.rgb *= backgroundIntensity;\n\tgl_FragColor = texColor;\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n}";


    const vertex$g = "varying vec3 vWorldDirection;\n#include <common>\nvoid main() {\n\tvWorldDirection = transformDirection( position, modelMatrix );\n\t#include <begin_vertex>\n\t#include <project_vertex>\n\tgl_Position.z = gl_Position.w;\n}";


    const fragment$g = "#ifdef ENVMAP_TYPE_CUBE\n\tuniform samplerCube envMap;\n#elif defined( ENVMAP_TYPE_CUBE_UV )\n\tuniform sampler2D envMap;\n#endif\nuniform float flipEnvMap;\nuniform float backgroundBlurriness;\nuniform float backgroundIntensity;\nvarying vec3 vWorldDirection;\n#include <cube_uv_reflection_fragment>\nvoid main() {\n\t#ifdef ENVMAP_TYPE_CUBE\n\t\tvec4 texColor = textureCube( envMap, vec3( flipEnvMap * vWorldDirection.x, vWorldDirection.yz ) );\n\t#elif defined( ENVMAP_TYPE_CUBE_UV )\n\t\tvec4 texColor = textureCubeUV( envMap, vWorldDirection, backgroundBlurriness );\n\t#else\n\t\tvec4 texColor = vec4( 0.0, 0.0, 0.0, 1.0 );\n\t#endif\n\ttexColor.rgb *= backgroundIntensity;\n\tgl_FragColor = texColor;\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n}";


    const vertex$f = "varying vec3 vWorldDirection;\n#include <common>\nvoid main() {\n\tvWorldDirection = transformDirection( position, modelMatrix );\n\t#include <begin_vertex>\n\t#include <project_vertex>\n\tgl_Position.z = gl_Position.w;\n}";


    const fragment$f = "uniform samplerCube tCube;\nuniform float tFlip;\nuniform float opacity;\nvarying vec3 vWorldDirection;\nvoid main() {\n\tvec4 texColor = textureCube( tCube, vec3( tFlip * vWorldDirection.x, vWorldDirection.yz ) );\n\tgl_FragColor = texColor;\n\tgl_FragColor.a *= opacity;\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n}";


    const vertex$e = "#include <common>\n#include <batching_pars_vertex>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvarying vec2 vHighPrecisionZW;\nvoid main() {\n\t#include <uv_vertex>\n\t#include <batching_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_DISPLACEMENTMAP\n\t\t#include <beginnormal_vertex>\n\t\t#include <morphnormal_vertex>\n\t\t#include <skinnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvHighPrecisionZW = gl_Position.zw;\n}";


    const fragment$e = "#if DEPTH_PACKING == 3200\n\tuniform float opacity;\n#endif\n#include <common>\n#include <packing>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <alphatest_pars_fragment>\n#include <alphahash_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvarying vec2 vHighPrecisionZW;\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( 1.0 );\n\t#if DEPTH_PACKING == 3200\n\t\tdiffuseColor.a = opacity;\n\t#endif\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <alphahash_fragment>\n\t#include <logdepthbuf_fragment>\n\tfloat fragCoordZ = 0.5 * vHighPrecisionZW[0] / vHighPrecisionZW[1] + 0.5;\n\t#if DEPTH_PACKING == 3200\n\t\tgl_FragColor = vec4( vec3( 1.0 - fragCoordZ ), opacity );\n\t#elif DEPTH_PACKING == 3201\n\t\tgl_FragColor = packDepthToRGBA( fragCoordZ );\n\t#endif\n}";


    const vertex$d = "#define DISTANCE\nvarying vec3 vWorldPosition;\n#include <common>\n#include <batching_pars_vertex>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <batching_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_DISPLACEMENTMAP\n\t\t#include <beginnormal_vertex>\n\t\t#include <morphnormal_vertex>\n\t\t#include <skinnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <worldpos_vertex>\n\t#include <clipping_planes_vertex>\n\tvWorldPosition = worldPosition.xyz;\n}";


    const fragment$d = "#define DISTANCE\nuniform vec3 referencePosition;\nuniform float nearDistance;\nuniform float farDistance;\nvarying vec3 vWorldPosition;\n#include <common>\n#include <packing>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <alphatest_pars_fragment>\n#include <alphahash_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main () {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( 1.0 );\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <alphahash_fragment>\n\tfloat dist = length( vWorldPosition - referencePosition );\n\tdist = ( dist - nearDistance ) / ( farDistance - nearDistance );\n\tdist = saturate( dist );\n\tgl_FragColor = packDepthToRGBA( dist );\n}";


    const vertex$c = "varying vec3 vWorldDirection;\n#include <common>\nvoid main() {\n\tvWorldDirection = transformDirection( position, modelMatrix );\n\t#include <begin_vertex>\n\t#include <project_vertex>\n}";


    const fragment$c = "uniform sampler2D tEquirect;\nvarying vec3 vWorldDirection;\n#include <common>\nvoid main() {\n\tvec3 direction = normalize( vWorldDirection );\n\tvec2 sampleUV = equirectUv( direction );\n\tgl_FragColor = texture2D( tEquirect, sampleUV );\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n}";


    const vertex$b = "uniform float scale;\nattribute float lineDistance;\nvarying float vLineDistance;\n#include <common>\n#include <uv_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\tvLineDistance = scale * lineDistance;\n\t#include <uv_vertex>\n\t#include <color_vertex>\n\t#include <morphcolor_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <fog_vertex>\n}";


    const fragment$b = "uniform vec3 diffuse;\nuniform float opacity;\nuniform float dashSize;\nuniform float totalSize;\nvarying float vLineDistance;\n#include <common>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tif ( mod( vLineDistance, totalSize ) > dashSize ) {\n\t\tdiscard;\n\t}\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\t#include <opaque_fragment>\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n}";


    const vertex$a = "#include <common>\n#include <batching_pars_vertex>\n#include <uv_pars_vertex>\n#include <envmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <color_vertex>\n\t#include <morphcolor_vertex>\n\t#include <batching_vertex>\n\t#if defined ( USE_ENVMAP ) || defined ( USE_SKINNING )\n\t\t#include <beginnormal_vertex>\n\t\t#include <morphnormal_vertex>\n\t\t#include <skinbase_vertex>\n\t\t#include <skinnormal_vertex>\n\t\t#include <defaultnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <worldpos_vertex>\n\t#include <envmap_vertex>\n\t#include <fog_vertex>\n}";


    const fragment$a = "uniform vec3 diffuse;\nuniform float opacity;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <alphatest_pars_fragment>\n#include <alphahash_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_pars_fragment>\n#include <fog_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <alphahash_fragment>\n\t#include <specularmap_fragment>\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\t#ifdef USE_LIGHTMAP\n\t\tvec4 lightMapTexel = texture2D( lightMap, vLightMapUv );\n\t\treflectedLight.indirectDiffuse += lightMapTexel.rgb * lightMapIntensity * RECIPROCAL_PI;\n\t#else\n\t\treflectedLight.indirectDiffuse += vec3( 1.0 );\n\t#endif\n\t#include <aomap_fragment>\n\treflectedLight.indirectDiffuse *= diffuseColor.rgb;\n\tvec3 outgoingLight = reflectedLight.indirectDiffuse;\n\t#include <envmap_fragment>\n\t#include <opaque_fragment>\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";


    const vertex$9 = "#define LAMBERT\nvarying vec3 vViewPosition;\n#include <common>\n#include <batching_pars_vertex>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <envmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <normal_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <color_vertex>\n\t#include <morphcolor_vertex>\n\t#include <batching_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <normal_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <envmap_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";


    const fragment$9 = "#define LAMBERT\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <alphatest_pars_fragment>\n#include <alphahash_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_pars_fragment>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <normal_pars_fragment>\n#include <lights_lambert_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <alphahash_fragment>\n\t#include <specularmap_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_lambert_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + totalEmissiveRadiance;\n\t#include <envmap_fragment>\n\t#include <opaque_fragment>\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";


    const vertex$8 = "#define MATCAP\nvarying vec3 vViewPosition;\n#include <common>\n#include <batching_pars_vertex>\n#include <uv_pars_vertex>\n#include <color_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <fog_pars_vertex>\n#include <normal_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <color_vertex>\n\t#include <morphcolor_vertex>\n\t#include <batching_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <normal_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <fog_vertex>\n\tvViewPosition = - mvPosition.xyz;\n}";


    const fragment$8 = "#define MATCAP\nuniform vec3 diffuse;\nuniform float opacity;\nuniform sampler2D matcap;\nvarying vec3 vViewPosition;\n#include <common>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <alphatest_pars_fragment>\n#include <alphahash_pars_fragment>\n#include <fog_pars_fragment>\n#include <normal_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <alphahash_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\tvec3 viewDir = normalize( vViewPosition );\n\tvec3 x = normalize( vec3( viewDir.z, 0.0, - viewDir.x ) );\n\tvec3 y = cross( viewDir, x );\n\tvec2 uv = vec2( dot( x, normal ), dot( y, normal ) ) * 0.495 + 0.5;\n\t#ifdef USE_MATCAP\n\t\tvec4 matcapColor = texture2D( matcap, uv );\n\t#else\n\t\tvec4 matcapColor = vec4( vec3( mix( 0.2, 0.8, uv.y ) ), 1.0 );\n\t#endif\n\tvec3 outgoingLight = diffuseColor.rgb * matcapColor.rgb;\n\t#include <opaque_fragment>\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";


    const vertex$7 = "#define NORMAL\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( USE_NORMALMAP_TANGENTSPACE )\n\tvarying vec3 vViewPosition;\n#endif\n#include <common>\n#include <batching_pars_vertex>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <normal_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <batching_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <normal_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( USE_NORMALMAP_TANGENTSPACE )\n\tvViewPosition = - mvPosition.xyz;\n#endif\n}";


    const fragment$7 = "#define NORMAL\nuniform float opacity;\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( USE_NORMALMAP_TANGENTSPACE )\n\tvarying vec3 vViewPosition;\n#endif\n#include <packing>\n#include <uv_pars_fragment>\n#include <normal_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\t#include <logdepthbuf_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\tgl_FragColor = vec4( packNormalToRGB( normal ), opacity );\n\t#ifdef OPAQUE\n\t\tgl_FragColor.a = 1.0;\n\t#endif\n}";


    const vertex$6 = "#define PHONG\nvarying vec3 vViewPosition;\n#include <common>\n#include <batching_pars_vertex>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <envmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <normal_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <color_vertex>\n\t#include <morphcolor_vertex>\n\t#include <batching_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <normal_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <envmap_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";


    const fragment$6 = "#define PHONG\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform vec3 specular;\nuniform float shininess;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <alphatest_pars_fragment>\n#include <alphahash_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_pars_fragment>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <normal_pars_fragment>\n#include <lights_phong_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <alphahash_fragment>\n\t#include <specularmap_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_phong_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular + totalEmissiveRadiance;\n\t#include <envmap_fragment>\n\t#include <opaque_fragment>\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";


    const vertex$5 = "#define STANDARD\nvarying vec3 vViewPosition;\n#ifdef USE_TRANSMISSION\n\tvarying vec3 vWorldPosition;\n#endif\n#include <common>\n#include <batching_pars_vertex>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <normal_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <color_vertex>\n\t#include <morphcolor_vertex>\n\t#include <batching_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <normal_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n#ifdef USE_TRANSMISSION\n\tvWorldPosition = worldPosition.xyz;\n#endif\n}";


    const fragment$5 = "#define STANDARD\n#ifdef PHYSICAL\n\t#define IOR\n\t#define USE_SPECULAR\n#endif\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform float roughness;\nuniform float metalness;\nuniform float opacity;\n#ifdef IOR\n\tuniform float ior;\n#endif\n#ifdef USE_SPECULAR\n\tuniform float specularIntensity;\n\tuniform vec3 specularColor;\n\t#ifdef USE_SPECULAR_COLORMAP\n\t\tuniform sampler2D specularColorMap;\n\t#endif\n\t#ifdef USE_SPECULAR_INTENSITYMAP\n\t\tuniform sampler2D specularIntensityMap;\n\t#endif\n#endif\n#ifdef USE_CLEARCOAT\n\tuniform float clearcoat;\n\tuniform float clearcoatRoughness;\n#endif\n#ifdef USE_IRIDESCENCE\n\tuniform float iridescence;\n\tuniform float iridescenceIOR;\n\tuniform float iridescenceThicknessMinimum;\n\tuniform float iridescenceThicknessMaximum;\n#endif\n#ifdef USE_SHEEN\n\tuniform vec3 sheenColor;\n\tuniform float sheenRoughness;\n\t#ifdef USE_SHEEN_COLORMAP\n\t\tuniform sampler2D sheenColorMap;\n\t#endif\n\t#ifdef USE_SHEEN_ROUGHNESSMAP\n\t\tuniform sampler2D sheenRoughnessMap;\n\t#endif\n#endif\n#ifdef USE_ANISOTROPY\n\tuniform vec2 anisotropyVector;\n\t#ifdef USE_ANISOTROPYMAP\n\t\tuniform sampler2D anisotropyMap;\n\t#endif\n#endif\nvarying vec3 vViewPosition;\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <alphatest_pars_fragment>\n#include <alphahash_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <iridescence_fragment>\n#include <cube_uv_reflection_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_physical_pars_fragment>\n#include <fog_pars_fragment>\n#include <lights_pars_begin>\n#include <normal_pars_fragment>\n#include <lights_physical_pars_fragment>\n#include <transmission_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <clearcoat_pars_fragment>\n#include <iridescence_pars_fragment>\n#include <roughnessmap_pars_fragment>\n#include <metalnessmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <alphahash_fragment>\n\t#include <roughnessmap_fragment>\n\t#include <metalnessmap_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <clearcoat_normal_fragment_begin>\n\t#include <clearcoat_normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_physical_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 totalDiffuse = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse;\n\tvec3 totalSpecular = reflectedLight.directSpecular + reflectedLight.indirectSpecular;\n\t#include <transmission_fragment>\n\tvec3 outgoingLight = totalDiffuse + totalSpecular + totalEmissiveRadiance;\n\t#ifdef USE_SHEEN\n\t\tfloat sheenEnergyComp = 1.0 - 0.157 * max3( material.sheenColor );\n\t\toutgoingLight = outgoingLight * sheenEnergyComp + sheenSpecularDirect + sheenSpecularIndirect;\n\t#endif\n\t#ifdef USE_CLEARCOAT\n\t\tfloat dotNVcc = saturate( dot( geometryClearcoatNormal, geometryViewDir ) );\n\t\tvec3 Fcc = F_Schlick( material.clearcoatF0, material.clearcoatF90, dotNVcc );\n\t\toutgoingLight = outgoingLight * ( 1.0 - material.clearcoat * Fcc ) + ( clearcoatSpecularDirect + clearcoatSpecularIndirect ) * material.clearcoat;\n\t#endif\n\t#include <opaque_fragment>\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";


    const vertex$4 = "#define TOON\nvarying vec3 vViewPosition;\n#include <common>\n#include <batching_pars_vertex>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <normal_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <color_vertex>\n\t#include <morphcolor_vertex>\n\t#include <batching_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <normal_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";


    const fragment$4 = "#define TOON\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <alphatest_pars_fragment>\n#include <alphahash_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <gradientmap_pars_fragment>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <normal_pars_fragment>\n#include <lights_toon_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <alphahash_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_toon_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + totalEmissiveRadiance;\n\t#include <opaque_fragment>\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";


    const vertex$3 = "uniform float size;\nuniform float scale;\n#include <common>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\n#ifdef USE_POINTS_UV\n\tvarying vec2 vUv;\n\tuniform mat3 uvTransform;\n#endif\nvoid main() {\n\t#ifdef USE_POINTS_UV\n\t\tvUv = ( uvTransform * vec3( uv, 1 ) ).xy;\n\t#endif\n\t#include <color_vertex>\n\t#include <morphcolor_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <project_vertex>\n\tgl_PointSize = size;\n\t#ifdef USE_SIZEATTENUATION\n\t\tbool isPerspective = isPerspectiveMatrix( projectionMatrix );\n\t\tif ( isPerspective ) gl_PointSize *= ( scale / - mvPosition.z );\n\t#endif\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <worldpos_vertex>\n\t#include <fog_vertex>\n}";


    const fragment$3 = "uniform vec3 diffuse;\nuniform float opacity;\n#include <common>\n#include <color_pars_fragment>\n#include <map_particle_pars_fragment>\n#include <alphatest_pars_fragment>\n#include <alphahash_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_particle_fragment>\n\t#include <color_fragment>\n\t#include <alphatest_fragment>\n\t#include <alphahash_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\t#include <opaque_fragment>\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n}";


    const vertex$2 = "#include <common>\n#include <batching_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <shadowmap_pars_vertex>\nvoid main() {\n\t#include <batching_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <worldpos_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";


    const fragment$2 = "uniform vec3 color;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <logdepthbuf_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <shadowmask_pars_fragment>\nvoid main() {\n\t#include <logdepthbuf_fragment>\n\tgl_FragColor = vec4( color, opacity * ( 1.0 - getShadowMask() ) );\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n\t#include <fog_fragment>\n}";


    const vertex$1 = "uniform float rotation;\nuniform vec2 center;\n#include <common>\n#include <uv_pars_vertex>\n#include <fog_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\tvec4 mvPosition = modelViewMatrix * vec4( 0.0, 0.0, 0.0, 1.0 );\n\tvec2 scale;\n\tscale.x = length( vec3( modelMatrix[ 0 ].x, modelMatrix[ 0 ].y, modelMatrix[ 0 ].z ) );\n\tscale.y = length( vec3( modelMatrix[ 1 ].x, modelMatrix[ 1 ].y, modelMatrix[ 1 ].z ) );\n\t#ifndef USE_SIZEATTENUATION\n\t\tbool isPerspective = isPerspectiveMatrix( projectionMatrix );\n\t\tif ( isPerspective ) scale *= - mvPosition.z;\n\t#endif\n\tvec2 alignedPosition = ( position.xy - ( center - vec2( 0.5 ) ) ) * scale;\n\tvec2 rotatedPosition;\n\trotatedPosition.x = cos( rotation ) * alignedPosition.x - sin( rotation ) * alignedPosition.y;\n\trotatedPosition.y = sin( rotation ) * alignedPosition.x + cos( rotation ) * alignedPosition.y;\n\tmvPosition.xy += rotatedPosition;\n\tgl_Position = projectionMatrix * mvPosition;\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <fog_vertex>\n}";


    const fragment$1 = "uniform vec3 diffuse;\nuniform float opacity;\n#include <common>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <alphatest_pars_fragment>\n#include <alphahash_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <alphahash_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\t#include <opaque_fragment>\n\t#include <tonemapping_fragment>\n\t#include <colorspace_fragment>\n\t#include <fog_fragment>\n}";


    const ShaderChunk = {

        alphahash_fragment: alphahash_fragment,

        alphahash_pars_fragment: alphahash_pars_fragment,

        alphamap_fragment: alphamap_fragment,

        alphamap_pars_fragment: alphamap_pars_fragment,

        alphatest_fragment: alphatest_fragment,

        alphatest_pars_fragment: alphatest_pars_fragment,

        aomap_fragment: aomap_fragment,

        aomap_pars_fragment: aomap_pars_fragment,

        batching_pars_vertex: batching_pars_vertex,

        batching_vertex: batching_vertex,

        begin_vertex: begin_vertex,

        beginnormal_vertex: beginnormal_vertex,

        bsdfs: bsdfs,

        iridescence_fragment: iridescence_fragment,

        bumpmap_pars_fragment: bumpmap_pars_fragment,

        clipping_planes_fragment: clipping_planes_fragment,

        clipping_planes_pars_fragment: clipping_planes_pars_fragment,

        clipping_planes_pars_vertex: clipping_planes_pars_vertex,

        clipping_planes_vertex: clipping_planes_vertex,

        color_fragment: color_fragment,

        color_pars_fragment: color_pars_fragment,

        color_pars_vertex: color_pars_vertex,

        color_vertex: color_vertex,

        common: common,

        cube_uv_reflection_fragment: cube_uv_reflection_fragment,

        defaultnormal_vertex: defaultnormal_vertex,

        displacementmap_pars_vertex: displacementmap_pars_vertex,

        displacementmap_vertex: displacementmap_vertex,

        emissivemap_fragment: emissivemap_fragment,

        emissivemap_pars_fragment: emissivemap_pars_fragment,

        colorspace_fragment: colorspace_fragment,

        colorspace_pars_fragment: colorspace_pars_fragment,

        envmap_fragment: envmap_fragment,

        envmap_common_pars_fragment: envmap_common_pars_fragment,

        envmap_pars_fragment: envmap_pars_fragment,

        envmap_pars_vertex: envmap_pars_vertex,

        envmap_physical_pars_fragment: envmap_physical_pars_fragment,

        envmap_vertex: envmap_vertex,

        fog_vertex: fog_vertex,

        fog_pars_vertex: fog_pars_vertex,

        fog_fragment: fog_fragment,

        fog_pars_fragment: fog_pars_fragment,

        gradientmap_pars_fragment: gradientmap_pars_fragment,

        lightmap_fragment: lightmap_fragment,

        lightmap_pars_fragment: lightmap_pars_fragment,

        lights_lambert_fragment: lights_lambert_fragment,

        lights_lambert_pars_fragment: lights_lambert_pars_fragment,

        lights_pars_begin: lights_pars_begin,

        lights_toon_fragment: lights_toon_fragment,

        lights_toon_pars_fragment: lights_toon_pars_fragment,

        lights_phong_fragment: lights_phong_fragment,

        lights_phong_pars_fragment: lights_phong_pars_fragment,

        lights_physical_fragment: lights_physical_fragment,

        lights_physical_pars_fragment: lights_physical_pars_fragment,

        lights_fragment_begin: lights_fragment_begin,

        lights_fragment_maps: lights_fragment_maps,

        lights_fragment_end: lights_fragment_end,

        logdepthbuf_fragment: logdepthbuf_fragment,

        logdepthbuf_pars_fragment: logdepthbuf_pars_fragment,

        logdepthbuf_pars_vertex: logdepthbuf_pars_vertex,

        logdepthbuf_vertex: logdepthbuf_vertex,

        map_fragment: map_fragment,

        map_pars_fragment: map_pars_fragment,

        map_particle_fragment: map_particle_fragment,

        map_particle_pars_fragment: map_particle_pars_fragment,

        metalnessmap_fragment: metalnessmap_fragment,

        metalnessmap_pars_fragment: metalnessmap_pars_fragment,

        morphcolor_vertex: morphcolor_vertex,

        morphnormal_vertex: morphnormal_vertex,

        morphtarget_pars_vertex: morphtarget_pars_vertex,

        morphtarget_vertex: morphtarget_vertex,

        normal_fragment_begin: normal_fragment_begin,

        normal_fragment_maps: normal_fragment_maps,

        normal_pars_fragment: normal_pars_fragment,

        normal_pars_vertex: normal_pars_vertex,

        normal_vertex: normal_vertex,

        normalmap_pars_fragment: normalmap_pars_fragment,

        clearcoat_normal_fragment_begin: clearcoat_normal_fragment_begin,

        clearcoat_normal_fragment_maps: clearcoat_normal_fragment_maps,

        clearcoat_pars_fragment: clearcoat_pars_fragment,

        iridescence_pars_fragment: iridescence_pars_fragment,

        opaque_fragment: opaque_fragment,

        packing: packing,

        premultiplied_alpha_fragment: premultiplied_alpha_fragment,

        project_vertex: project_vertex,

        dithering_fragment: dithering_fragment,

        dithering_pars_fragment: dithering_pars_fragment,

        roughnessmap_fragment: roughnessmap_fragment,

        roughnessmap_pars_fragment: roughnessmap_pars_fragment,

        shadowmap_pars_fragment: shadowmap_pars_fragment,

        shadowmap_pars_vertex: shadowmap_pars_vertex,

        shadowmap_vertex: shadowmap_vertex,

        shadowmask_pars_fragment: shadowmask_pars_fragment,

        skinbase_vertex: skinbase_vertex,

        skinning_pars_vertex: skinning_pars_vertex,

        skinning_vertex: skinning_vertex,

        skinnormal_vertex: skinnormal_vertex,

        specularmap_fragment: specularmap_fragment,

        specularmap_pars_fragment: specularmap_pars_fragment,

        tonemapping_fragment: tonemapping_fragment,

        tonemapping_pars_fragment: tonemapping_pars_fragment,

        transmission_fragment: transmission_fragment,

        transmission_pars_fragment: transmission_pars_fragment,

        uv_pars_fragment: uv_pars_fragment,

        uv_pars_vertex: uv_pars_vertex,

        uv_vertex: uv_vertex,

        worldpos_vertex: worldpos_vertex,


        background_vert: vertex$h,

        background_frag: fragment$h,

        backgroundCube_vert: vertex$g,

        backgroundCube_frag: fragment$g,

        cube_vert: vertex$f,

        cube_frag: fragment$f,

        depth_vert: vertex$e,

        depth_frag: fragment$e,

        distanceRGBA_vert: vertex$d,

        distanceRGBA_frag: fragment$d,

        equirect_vert: vertex$c,

        equirect_frag: fragment$c,

        linedashed_vert: vertex$b,

        linedashed_frag: fragment$b,

        meshbasic_vert: vertex$a,

        meshbasic_frag: fragment$a,

        meshlambert_vert: vertex$9,

        meshlambert_frag: fragment$9,

        meshmatcap_vert: vertex$8,

        meshmatcap_frag: fragment$8,

        meshnormal_vert: vertex$7,

        meshnormal_frag: fragment$7,

        meshphong_vert: vertex$6,

        meshphong_frag: fragment$6,

        meshphysical_vert: vertex$5,

        meshphysical_frag: fragment$5,

        meshtoon_vert: vertex$4,

        meshtoon_frag: fragment$4,

        points_vert: vertex$3,

        points_frag: fragment$3,

        shadow_vert: vertex$2,

        shadow_frag: fragment$2,

        sprite_vert: vertex$1,

        sprite_frag: fragment$1

    };


    const UniformsLib = {


        common: {


            diffuse: { value: /*@__PURE__*/ new Color( 0xffffff ) },

            opacity: { value: 1.0 },


            map: { value: null },

            mapTransform: { value: /*@__PURE__*/ new Matrix3() },


            alphaMap: { value: null },

            alphaMapTransform: { value: /*@__PURE__*/ new Matrix3() },


            alphaTest: { value: 0 }


        },


        specularmap: {


            specularMap: { value: null },

            specularMapTransform: { value: /*@__PURE__*/ new Matrix3() }


        },


        envmap: {


            envMap: { value: null },

            flipEnvMap: { value: - 1 },

            reflectivity: { value: 1.0 }, // basic, lambert, phong

            ior: { value: 1.5 }, // physical

            refractionRatio: { value: 0.98 }, // basic, lambert, phong


        },


        aomap: {


            aoMap: { value: null },

            aoMapIntensity: { value: 1 },

            aoMapTransform: { value: /*@__PURE__*/ new Matrix3() }


        },


        lightmap: {


            lightMap: { value: null },

            lightMapIntensity: { value: 1 },

            lightMapTransform: { value: /*@__PURE__*/ new Matrix3() }


        },


        bumpmap: {


            bumpMap: { value: null },

            bumpMapTransform: { value: /*@__PURE__*/ new Matrix3() },

            bumpScale: { value: 1 }


        },


        normalmap: {


            normalMap: { value: null },

            normalMapTransform: { value: /*@__PURE__*/ new Matrix3() },

            normalScale: { value: /*@__PURE__*/ new Vector2( 1, 1 ) }


        },


        displacementmap: {


            displacementMap: { value: null },

            displacementMapTransform: { value: /*@__PURE__*/ new Matrix3() },

            displacementScale: { value: 1 },

            displacementBias: { value: 0 }


        },


        emissivemap: {


            emissiveMap: { value: null },

            emissiveMapTransform: { value: /*@__PURE__*/ new Matrix3() }


        },


        metalnessmap: {


            metalnessMap: { value: null },

            metalnessMapTransform: { value: /*@__PURE__*/ new Matrix3() }


        },


        roughnessmap: {


            roughnessMap: { value: null },

            roughnessMapTransform: { value: /*@__PURE__*/ new Matrix3() }


        },


        gradientmap: {


            gradientMap: { value: null }


        },


        fog: {


            fogDensity: { value: 0.00025 },

            fogNear: { value: 1 },

            fogFar: { value: 2000 },

            fogColor: { value: /*@__PURE__*/ new Color( 0xffffff ) }


        },


        lights: {


            ambientLightColor: { value: [] },


            lightProbe: { value: [] },


            directionalLights: { value: [], properties: {

                direction: {},

                color: {}

            } },


            directionalLightShadows: { value: [], properties: {

                shadowBias: {},

                shadowNormalBias: {},

                shadowRadius: {},

                shadowMapSize: {}

            } },


            directionalShadowMap: { value: [] },

            directionalShadowMatrix: { value: [] },


            spotLights: { value: [], properties: {

                color: {},

                position: {},

                direction: {},

                distance: {},

                coneCos: {},

                penumbraCos: {},

                decay: {}

            } },


            spotLightShadows: { value: [], properties: {

                shadowBias: {},

                shadowNormalBias: {},

                shadowRadius: {},

                shadowMapSize: {}

            } },


            spotLightMap: { value: [] },

            spotShadowMap: { value: [] },

            spotLightMatrix: { value: [] },


            pointLights: { value: [], properties: {

                color: {},

                position: {},

                decay: {},

                distance: {}

            } },


            pointLightShadows: { value: [], properties: {

                shadowBias: {},

                shadowNormalBias: {},

                shadowRadius: {},

                shadowMapSize: {},

                shadowCameraNear: {},

                shadowCameraFar: {}

            } },


            pointShadowMap: { value: [] },

            pointShadowMatrix: { value: [] },


            hemisphereLights: { value: [], properties: {

                direction: {},

                skyColor: {},

                groundColor: {}

            } },


            // TODO (abelnation): RectAreaLight BRDF data needs to be moved from example to main src

            rectAreaLights: { value: [], properties: {

                color: {},

                position: {},

                width: {},

                height: {}

            } },


            ltc_1: { value: null },

            ltc_2: { value: null }


        },


        points: {


            diffuse: { value: /*@__PURE__*/ new Color( 0xffffff ) },

            opacity: { value: 1.0 },

            size: { value: 1.0 },

            scale: { value: 1.0 },

            map: { value: null },

            alphaMap: { value: null },

            alphaMapTransform: { value: /*@__PURE__*/ new Matrix3() },

            alphaTest: { value: 0 },

            uvTransform: { value: /*@__PURE__*/ new Matrix3() }


        },


        sprite: {


            diffuse: { value: /*@__PURE__*/ new Color( 0xffffff ) },

            opacity: { value: 1.0 },

            center: { value: /*@__PURE__*/ new Vector2( 0.5, 0.5 ) },

            rotation: { value: 0.0 },

            map: { value: null },

            mapTransform: { value: /*@__PURE__*/ new Matrix3() },

            alphaMap: { value: null },

            alphaMapTransform: { value: /*@__PURE__*/ new Matrix3() },

            alphaTest: { value: 0 }


        }


    };


    const ShaderLib = {


        basic: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.common,

                UniformsLib.specularmap,

                UniformsLib.envmap,

                UniformsLib.aomap,

                UniformsLib.lightmap,

                UniformsLib.fog

            ] ),


            vertexShader: ShaderChunk.meshbasic_vert,

            fragmentShader: ShaderChunk.meshbasic_frag


        },


        lambert: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.common,

                UniformsLib.specularmap,

                UniformsLib.envmap,

                UniformsLib.aomap,

                UniformsLib.lightmap,

                UniformsLib.emissivemap,

                UniformsLib.bumpmap,

                UniformsLib.normalmap,

                UniformsLib.displacementmap,

                UniformsLib.fog,

                UniformsLib.lights,

                {

                    emissive: { value: /*@__PURE__*/ new Color( 0x000000 ) }

                }

            ] ),


            vertexShader: ShaderChunk.meshlambert_vert,

            fragmentShader: ShaderChunk.meshlambert_frag


        },


        phong: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.common,

                UniformsLib.specularmap,

                UniformsLib.envmap,

                UniformsLib.aomap,

                UniformsLib.lightmap,

                UniformsLib.emissivemap,

                UniformsLib.bumpmap,

                UniformsLib.normalmap,

                UniformsLib.displacementmap,

                UniformsLib.fog,

                UniformsLib.lights,

                {

                    emissive: { value: /*@__PURE__*/ new Color( 0x000000 ) },

                    specular: { value: /*@__PURE__*/ new Color( 0x111111 ) },

                    shininess: { value: 30 }

                }

            ] ),


            vertexShader: ShaderChunk.meshphong_vert,

            fragmentShader: ShaderChunk.meshphong_frag


        },


        standard: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.common,

                UniformsLib.envmap,

                UniformsLib.aomap,

                UniformsLib.lightmap,

                UniformsLib.emissivemap,

                UniformsLib.bumpmap,

                UniformsLib.normalmap,

                UniformsLib.displacementmap,

                UniformsLib.roughnessmap,

                UniformsLib.metalnessmap,

                UniformsLib.fog,

                UniformsLib.lights,

                {

                    emissive: { value: /*@__PURE__*/ new Color( 0x000000 ) },

                    roughness: { value: 1.0 },

                    metalness: { value: 0.0 },

                    envMapIntensity: { value: 1 } // temporary

                }

            ] ),


            vertexShader: ShaderChunk.meshphysical_vert,

            fragmentShader: ShaderChunk.meshphysical_frag


        },


        toon: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.common,

                UniformsLib.aomap,

                UniformsLib.lightmap,

                UniformsLib.emissivemap,

                UniformsLib.bumpmap,

                UniformsLib.normalmap,

                UniformsLib.displacementmap,

                UniformsLib.gradientmap,

                UniformsLib.fog,

                UniformsLib.lights,

                {

                    emissive: { value: /*@__PURE__*/ new Color( 0x000000 ) }

                }

            ] ),


            vertexShader: ShaderChunk.meshtoon_vert,

            fragmentShader: ShaderChunk.meshtoon_frag


        },


        matcap: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.common,

                UniformsLib.bumpmap,

                UniformsLib.normalmap,

                UniformsLib.displacementmap,

                UniformsLib.fog,

                {

                    matcap: { value: null }

                }

            ] ),


            vertexShader: ShaderChunk.meshmatcap_vert,

            fragmentShader: ShaderChunk.meshmatcap_frag


        },


        points: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.points,

                UniformsLib.fog

            ] ),


            vertexShader: ShaderChunk.points_vert,

            fragmentShader: ShaderChunk.points_frag


        },


        dashed: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.common,

                UniformsLib.fog,

                {

                    scale: { value: 1 },

                    dashSize: { value: 1 },

                    totalSize: { value: 2 }

                }

            ] ),


            vertexShader: ShaderChunk.linedashed_vert,

            fragmentShader: ShaderChunk.linedashed_frag


        },


        depth: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.common,

                UniformsLib.displacementmap

            ] ),


            vertexShader: ShaderChunk.depth_vert,

            fragmentShader: ShaderChunk.depth_frag


        },


        normal: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.common,

                UniformsLib.bumpmap,

                UniformsLib.normalmap,

                UniformsLib.displacementmap,

                {

                    opacity: { value: 1.0 }

                }

            ] ),


            vertexShader: ShaderChunk.meshnormal_vert,

            fragmentShader: ShaderChunk.meshnormal_frag


        },


        sprite: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.sprite,

                UniformsLib.fog

            ] ),


            vertexShader: ShaderChunk.sprite_vert,

            fragmentShader: ShaderChunk.sprite_frag


        },


        background: {


            uniforms: {

                uvTransform: { value: /*@__PURE__*/ new Matrix3() },

                t2D: { value: null },

                backgroundIntensity: { value: 1 }

            },


            vertexShader: ShaderChunk.background_vert,

            fragmentShader: ShaderChunk.background_frag


        },


        backgroundCube: {


            uniforms: {

                envMap: { value: null },

                flipEnvMap: { value: - 1 },

                backgroundBlurriness: { value: 0 },

                backgroundIntensity: { value: 1 }

            },


            vertexShader: ShaderChunk.backgroundCube_vert,

            fragmentShader: ShaderChunk.backgroundCube_frag


        },


        cube: {


            uniforms: {

                tCube: { value: null },

                tFlip: { value: - 1 },

                opacity: { value: 1.0 }

            },


            vertexShader: ShaderChunk.cube_vert,

            fragmentShader: ShaderChunk.cube_frag


        },


        equirect: {


            uniforms: {

                tEquirect: { value: null },

            },


            vertexShader: ShaderChunk.equirect_vert,

            fragmentShader: ShaderChunk.equirect_frag


        },


        distanceRGBA: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.common,

                UniformsLib.displacementmap,

                {

                    referencePosition: { value: /*@__PURE__*/ new Vector3() },

                    nearDistance: { value: 1 },

                    farDistance: { value: 1000 }

                }

            ] ),


            vertexShader: ShaderChunk.distanceRGBA_vert,

            fragmentShader: ShaderChunk.distanceRGBA_frag


        },


        shadow: {


            uniforms: /*@__PURE__*/ mergeUniforms( [

                UniformsLib.lights,

                UniformsLib.fog,

                {

                    color: { value: /*@__PURE__*/ new Color( 0x00000 ) },

                    opacity: { value: 1.0 }

                },

            ] ),


            vertexShader: ShaderChunk.shadow_vert,

            fragmentShader: ShaderChunk.shadow_frag


        }


    };


    ShaderLib.physical = {


        uniforms: /*@__PURE__*/ mergeUniforms( [

            ShaderLib.standard.uniforms,

            {

                clearcoat: { value: 0 },

                clearcoatMap: { value: null },

                clearcoatMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                clearcoatNormalMap: { value: null },

                clearcoatNormalMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                clearcoatNormalScale: { value: /*@__PURE__*/ new Vector2( 1, 1 ) },

                clearcoatRoughness: { value: 0 },

                clearcoatRoughnessMap: { value: null },

                clearcoatRoughnessMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                iridescence: { value: 0 },

                iridescenceMap: { value: null },

                iridescenceMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                iridescenceIOR: { value: 1.3 },

                iridescenceThicknessMinimum: { value: 100 },

                iridescenceThicknessMaximum: { value: 400 },

                iridescenceThicknessMap: { value: null },

                iridescenceThicknessMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                sheen: { value: 0 },

                sheenColor: { value: /*@__PURE__*/ new Color( 0x000000 ) },

                sheenColorMap: { value: null },

                sheenColorMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                sheenRoughness: { value: 1 },

                sheenRoughnessMap: { value: null },

                sheenRoughnessMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                transmission: { value: 0 },

                transmissionMap: { value: null },

                transmissionMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                transmissionSamplerSize: { value: /*@__PURE__*/ new Vector2() },

                transmissionSamplerMap: { value: null },

                thickness: { value: 0 },

                thicknessMap: { value: null },

                thicknessMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                attenuationDistance: { value: 0 },

                attenuationColor: { value: /*@__PURE__*/ new Color( 0x000000 ) },

                specularColor: { value: /*@__PURE__*/ new Color( 1, 1, 1 ) },

                specularColorMap: { value: null },

                specularColorMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                specularIntensity: { value: 1 },

                specularIntensityMap: { value: null },

                specularIntensityMapTransform: { value: /*@__PURE__*/ new Matrix3() },

                anisotropyVector: { value: /*@__PURE__*/ new Vector2() },

                anisotropyMap: { value: null },

                anisotropyMapTransform: { value: /*@__PURE__*/ new Matrix3() },

            }

        ] ),


        vertexShader: ShaderChunk.meshphysical_vert,

        fragmentShader: ShaderChunk.meshphysical_frag


    };


    const _rgb = { r: 0, b: 0, g: 0 };


    function WebGLBackground( renderer, cubemaps, cubeuvmaps, state, objects, alpha, premultipliedAlpha ) {


        const clearColor = new Color( 0x000000 );

        let clearAlpha = alpha === true ? 0 : 1;


        let planeMesh;

        let boxMesh;


        let currentBackground = null;

        let currentBackgroundVersion = 0;

        let currentTonemapping = null;


        function render( renderList, scene ) {


            let forceClear = false;

            let background = scene.isScene === true ? scene.background : null;


            if ( background && background.isTexture ) {


                const usePMREM = scene.backgroundBlurriness > 0; // use PMREM if the user wants to blur the background

                background = ( usePMREM ? cubeuvmaps : cubemaps ).get( background );


            }


            if ( background === null ) {


                setClear( clearColor, clearAlpha );


            } else if ( background && background.isColor ) {


                setClear( background, 1 );

                forceClear = true;


            }


            const environmentBlendMode = renderer.xr.getEnvironmentBlendMode();


            if ( environmentBlendMode === 'additive' ) {


                state.buffers.color.setClear( 0, 0, 0, 1, premultipliedAlpha );


            } else if ( environmentBlendMode === 'alpha-blend' ) {


                state.buffers.color.setClear( 0, 0, 0, 0, premultipliedAlpha );


            }


            if ( renderer.autoClear || forceClear ) {


                renderer.clear( renderer.autoClearColor, renderer.autoClearDepth, renderer.autoClearStencil );


            }


            if ( background && ( background.isCubeTexture || background.mapping === CubeUVReflectionMapping ) ) {


                if ( boxMesh === undefined ) {


                    boxMesh = new Mesh(

                        new BoxGeometry( 1, 1, 1 ),

                        new ShaderMaterial( {

                            name: 'BackgroundCubeMaterial',

                            uniforms: cloneUniforms( ShaderLib.backgroundCube.uniforms ),

                            vertexShader: ShaderLib.backgroundCube.vertexShader,

                            fragmentShader: ShaderLib.backgroundCube.fragmentShader,

                            side: BackSide,

                            depthTest: false,

                            depthWrite: false,

                            fog: false

                        } )

                    );


                    boxMesh.geometry.deleteAttribute( 'normal' );

                    boxMesh.geometry.deleteAttribute( 'uv' );


                    boxMesh.onBeforeRender = function ( renderer, scene, camera ) {


                        this.matrixWorld.copyPosition( camera.matrixWorld );


                    };


                    // add "envMap" material property so the renderer can evaluate it like for built-in materials

                    Object.defineProperty( boxMesh.material, 'envMap', {


                        get: function () {


                            return this.uniforms.envMap.value;


                        }


                    } );


                    objects.update( boxMesh );


                }


                boxMesh.material.uniforms.envMap.value = background;

                boxMesh.material.uniforms.flipEnvMap.value = ( background.isCubeTexture && background.isRenderTargetTexture === false ) ? - 1 : 1;

                boxMesh.material.uniforms.backgroundBlurriness.value = scene.backgroundBlurriness;

                boxMesh.material.uniforms.backgroundIntensity.value = scene.backgroundIntensity;

                boxMesh.material.toneMapped = ColorManagement.getTransfer( background.colorSpace ) !== SRGBTransfer;


                if ( currentBackground !== background ||

                    currentBackgroundVersion !== background.version ||

                    currentTonemapping !== renderer.toneMapping ) {


                    boxMesh.material.needsUpdate = true;


                    currentBackground = background;

                    currentBackgroundVersion = background.version;

                    currentTonemapping = renderer.toneMapping;


                }


                boxMesh.layers.enableAll();


                // push to the pre-sorted opaque render list

                renderList.unshift( boxMesh, boxMesh.geometry, boxMesh.material, 0, 0, null );


            } else if ( background && background.isTexture ) {


                if ( planeMesh === undefined ) {


                    planeMesh = new Mesh(

                        new PlaneGeometry( 2, 2 ),

                        new ShaderMaterial( {

                            name: 'BackgroundMaterial',

                            uniforms: cloneUniforms( ShaderLib.background.uniforms ),

                            vertexShader: ShaderLib.background.vertexShader,

                            fragmentShader: ShaderLib.background.fragmentShader,

                            side: FrontSide,

                            depthTest: false,

                            depthWrite: false,

                            fog: false

                        } )

                    );


                    planeMesh.geometry.deleteAttribute( 'normal' );


                    // add "map" material property so the renderer can evaluate it like for built-in materials

                    Object.defineProperty( planeMesh.material, 'map', {


                        get: function () {


                            return this.uniforms.t2D.value;


                        }


                    } );


                    objects.update( planeMesh );


                }


                planeMesh.material.uniforms.t2D.value = background;

                planeMesh.material.uniforms.backgroundIntensity.value = scene.backgroundIntensity;

                planeMesh.material.toneMapped = ColorManagement.getTransfer( background.colorSpace ) !== SRGBTransfer;


                if ( background.matrixAutoUpdate === true ) {


                    background.updateMatrix();


                }


                planeMesh.material.uniforms.uvTransform.value.copy( background.matrix );


                if ( currentBackground !== background ||

                    currentBackgroundVersion !== background.version ||

                    currentTonemapping !== renderer.toneMapping ) {


                    planeMesh.material.needsUpdate = true;


                    currentBackground = background;

                    currentBackgroundVersion = background.version;

                    currentTonemapping = renderer.toneMapping;


                }


                planeMesh.layers.enableAll();


                // push to the pre-sorted opaque render list

                renderList.unshift( planeMesh, planeMesh.geometry, planeMesh.material, 0, 0, null );


            }


        }


        function setClear( color, alpha ) {


            color.getRGB( _rgb, getUnlitUniformColorSpace( renderer ) );


            state.buffers.color.setClear( _rgb.r, _rgb.g, _rgb.b, alpha, premultipliedAlpha );


        }


        return {


            getClearColor: function () {


                return clearColor;


            },

            setClearColor: function ( color, alpha = 1 ) {


                clearColor.set( color );

                clearAlpha = alpha;

                setClear( clearColor, clearAlpha );


            },

            getClearAlpha: function () {


                return clearAlpha;


            },

            setClearAlpha: function ( alpha ) {


                clearAlpha = alpha;

                setClear( clearColor, clearAlpha );


            },

            render: render


        };


    }


    function WebGLBindingStates( gl, extensions, attributes, capabilities ) {


        const maxVertexAttributes = gl.getParameter( gl.MAX_VERTEX_ATTRIBS );


        const extension = capabilities.isWebGL2 ? null : extensions.get( 'OES_vertex_array_object' );

        const vaoAvailable = capabilities.isWebGL2 || extension !== null;


        const bindingStates = {};


        const defaultState = createBindingState( null );

        let currentState = defaultState;

        let forceUpdate = false;


        function setup( object, material, program, geometry, index ) {


            let updateBuffers = false;


            if ( vaoAvailable ) {


                const state = getBindingState( geometry, program, material );


                if ( currentState !== state ) {


                    currentState = state;

                    bindVertexArrayObject( currentState.object );


                }


                updateBuffers = needsUpdate( object, geometry, program, index );


                if ( updateBuffers ) saveCache( object, geometry, program, index );


            } else {


                const wireframe = ( material.wireframe === true );


                if ( currentState.geometry !== geometry.id ||

                    currentState.program !== program.id ||

                    currentState.wireframe !== wireframe ) {


                    currentState.geometry = geometry.id;

                    currentState.program = program.id;

                    currentState.wireframe = wireframe;


                    updateBuffers = true;


                }


            }


            if ( index !== null ) {


                attributes.update( index, gl.ELEMENT_ARRAY_BUFFER );


            }


            if ( updateBuffers || forceUpdate ) {


                forceUpdate = false;


                setupVertexAttributes( object, material, program, geometry );


                if ( index !== null ) {


                    gl.bindBuffer( gl.ELEMENT_ARRAY_BUFFER, attributes.get( index ).buffer );


                }


            }


        }


        function createVertexArrayObject() {


            if ( capabilities.isWebGL2 ) return gl.createVertexArray();


            return extension.createVertexArrayOES();


        }


        function bindVertexArrayObject( vao ) {


            if ( capabilities.isWebGL2 ) return gl.bindVertexArray( vao );


            return extension.bindVertexArrayOES( vao );


        }


        function deleteVertexArrayObject( vao ) {


            if ( capabilities.isWebGL2 ) return gl.deleteVertexArray( vao );


            return extension.deleteVertexArrayOES( vao );


        }


        function getBindingState( geometry, program, material ) {


            const wireframe = ( material.wireframe === true );


            let programMap = bindingStates[ geometry.id ];


            if ( programMap === undefined ) {


                programMap = {};

                bindingStates[ geometry.id ] = programMap;


            }


            let stateMap = programMap[ program.id ];


            if ( stateMap === undefined ) {


                stateMap = {};

                programMap[ program.id ] = stateMap;


            }


            let state = stateMap[ wireframe ];


            if ( state === undefined ) {


                state = createBindingState( createVertexArrayObject() );

                stateMap[ wireframe ] = state;


            }


            return state;


        }


        function createBindingState( vao ) {


            const newAttributes = [];

            const enabledAttributes = [];

            const attributeDivisors = [];


            for ( let i = 0; i < maxVertexAttributes; i ++ ) {


                newAttributes[ i ] = 0;

                enabledAttributes[ i ] = 0;

                attributeDivisors[ i ] = 0;


            }


            return {


                // for backward compatibility on non-VAO support browser

                geometry: null,

                program: null,

                wireframe: false,


                newAttributes: newAttributes,

                enabledAttributes: enabledAttributes,

                attributeDivisors: attributeDivisors,

                object: vao,

                attributes: {},

                index: null


            };


        }


        function needsUpdate( object, geometry, program, index ) {


            const cachedAttributes = currentState.attributes;

            const geometryAttributes = geometry.attributes;


            let attributesNum = 0;


            const programAttributes = program.getAttributes();


            for ( const name in programAttributes ) {


                const programAttribute = programAttributes[ name ];


                if ( programAttribute.location >= 0 ) {


                    const cachedAttribute = cachedAttributes[ name ];

                    let geometryAttribute = geometryAttributes[ name ];


                    if ( geometryAttribute === undefined ) {


                        if ( name === 'instanceMatrix' && object.instanceMatrix ) geometryAttribute = object.instanceMatrix;

                        if ( name === 'instanceColor' && object.instanceColor ) geometryAttribute = object.instanceColor;


                    }


                    if ( cachedAttribute === undefined ) return true;


                    if ( cachedAttribute.attribute !== geometryAttribute ) return true;


                    if ( geometryAttribute && cachedAttribute.data !== geometryAttribute.data ) return true;


                    attributesNum ++;


                }


            }


            if ( currentState.attributesNum !== attributesNum ) return true;


            if ( currentState.index !== index ) return true;


            return false;


        }


        function saveCache( object, geometry, program, index ) {


            const cache = {};

            const attributes = geometry.attributes;

            let attributesNum = 0;


            const programAttributes = program.getAttributes();


            for ( const name in programAttributes ) {


                const programAttribute = programAttributes[ name ];


                if ( programAttribute.location >= 0 ) {


                    let attribute = attributes[ name ];


                    if ( attribute === undefined ) {


                        if ( name === 'instanceMatrix' && object.instanceMatrix ) attribute = object.instanceMatrix;

                        if ( name === 'instanceColor' && object.instanceColor ) attribute = object.instanceColor;


                    }


                    const data = {};

                    data.attribute = attribute;


                    if ( attribute && attribute.data ) {


                        data.data = attribute.data;


                    }


                    cache[ name ] = data;


                    attributesNum ++;


                }


            }


            currentState.attributes = cache;

            currentState.attributesNum = attributesNum;


            currentState.index = index;


        }


        function initAttributes() {


            const newAttributes = currentState.newAttributes;


            for ( let i = 0, il = newAttributes.length; i < il; i ++ ) {


                newAttributes[ i ] = 0;


            }


        }


        function enableAttribute( attribute ) {


            enableAttributeAndDivisor( attribute, 0 );


        }


        function enableAttributeAndDivisor( attribute, meshPerAttribute ) {


            const newAttributes = currentState.newAttributes;

            const enabledAttributes = currentState.enabledAttributes;

            const attributeDivisors = currentState.attributeDivisors;


            newAttributes[ attribute ] = 1;


            if ( enabledAttributes[ attribute ] === 0 ) {


                gl.enableVertexAttribArray( attribute );

                enabledAttributes[ attribute ] = 1;


            }


            if ( attributeDivisors[ attribute ] !== meshPerAttribute ) {


                const extension = capabilities.isWebGL2 ? gl : extensions.get( 'ANGLE_instanced_arrays' );


                extension[ capabilities.isWebGL2 ? 'vertexAttribDivisor' : 'vertexAttribDivisorANGLE' ]( attribute, meshPerAttribute );

                attributeDivisors[ attribute ] = meshPerAttribute;


            }


        }


        function disableUnusedAttributes() {


            const newAttributes = currentState.newAttributes;

            const enabledAttributes = currentState.enabledAttributes;


            for ( let i = 0, il = enabledAttributes.length; i < il; i ++ ) {


                if ( enabledAttributes[ i ] !== newAttributes[ i ] ) {


                    gl.disableVertexAttribArray( i );

                    enabledAttributes[ i ] = 0;


                }


            }


        }


        function vertexAttribPointer( index, size, type, normalized, stride, offset, integer ) {


            if ( integer === true ) {


                gl.vertexAttribIPointer( index, size, type, stride, offset );


            } else {


                gl.vertexAttribPointer( index, size, type, normalized, stride, offset );


            }


        }


        function setupVertexAttributes( object, material, program, geometry ) {


            if ( capabilities.isWebGL2 === false && ( object.isInstancedMesh || geometry.isInstancedBufferGeometry ) ) {


                if ( extensions.get( 'ANGLE_instanced_arrays' ) === null ) return;


            }


            initAttributes();


            const geometryAttributes = geometry.attributes;


            const programAttributes = program.getAttributes();


            const materialDefaultAttributeValues = material.defaultAttributeValues;


            for ( const name in programAttributes ) {


                const programAttribute = programAttributes[ name ];


                if ( programAttribute.location >= 0 ) {


                    let geometryAttribute = geometryAttributes[ name ];


                    if ( geometryAttribute === undefined ) {


                        if ( name === 'instanceMatrix' && object.instanceMatrix ) geometryAttribute = object.instanceMatrix;

                        if ( name === 'instanceColor' && object.instanceColor ) geometryAttribute = object.instanceColor;


                    }


                    if ( geometryAttribute !== undefined ) {


                        const normalized = geometryAttribute.normalized;

                        const size = geometryAttribute.itemSize;


                        const attribute = attributes.get( geometryAttribute );


                        // TODO Attribute may not be available on context restore


                        if ( attribute === undefined ) continue;


                        const buffer = attribute.buffer;

                        const type = attribute.type;

                        const bytesPerElement = attribute.bytesPerElement;


                        // check for integer attributes (WebGL 2 only)


                        const integer = ( capabilities.isWebGL2 === true && ( type === gl.INT || type === gl.UNSIGNED_INT || geometryAttribute.gpuType === IntType ) );


                        if ( geometryAttribute.isInterleavedBufferAttribute ) {


                            const data = geometryAttribute.data;

                            const stride = data.stride;

                            const offset = geometryAttribute.offset;


                            if ( data.isInstancedInterleavedBuffer ) {


                                for ( let i = 0; i < programAttribute.locationSize; i ++ ) {


                                    enableAttributeAndDivisor( programAttribute.location + i, data.meshPerAttribute );


                                }


                                if ( object.isInstancedMesh !== true && geometry._maxInstanceCount === undefined ) {


                                    geometry._maxInstanceCount = data.meshPerAttribute * data.count;


                                }


                            } else {


                                for ( let i = 0; i < programAttribute.locationSize; i ++ ) {


                                    enableAttribute( programAttribute.location + i );


                                }


                            }


                            gl.bindBuffer( gl.ARRAY_BUFFER, buffer );


                            for ( let i = 0; i < programAttribute.locationSize; i ++ ) {


                                vertexAttribPointer(

                                    programAttribute.location + i,

                                    size / programAttribute.locationSize,

                                    type,

                                    normalized,

                                    stride * bytesPerElement,

                                    ( offset + ( size / programAttribute.locationSize ) * i ) * bytesPerElement,

                                    integer

                                );


                            }


                        } else {


                            if ( geometryAttribute.isInstancedBufferAttribute ) {


                                for ( let i = 0; i < programAttribute.locationSize; i ++ ) {


                                    enableAttributeAndDivisor( programAttribute.location + i, geometryAttribute.meshPerAttribute );


                                }


                                if ( object.isInstancedMesh !== true && geometry._maxInstanceCount === undefined ) {


                                    geometry._maxInstanceCount = geometryAttribute.meshPerAttribute * geometryAttribute.count;


                                }


                            } else {


                                for ( let i = 0; i < programAttribute.locationSize; i ++ ) {


                                    enableAttribute( programAttribute.location + i );


                                }


                            }


                            gl.bindBuffer( gl.ARRAY_BUFFER, buffer );


                            for ( let i = 0; i < programAttribute.locationSize; i ++ ) {


                                vertexAttribPointer(

                                    programAttribute.location + i,

                                    size / programAttribute.locationSize,

                                    type,

                                    normalized,

                                    size * bytesPerElement,

                                    ( size / programAttribute.locationSize ) * i * bytesPerElement,

                                    integer

                                );


                            }


                        }


                    } else if ( materialDefaultAttributeValues !== undefined ) {


                        const value = materialDefaultAttributeValues[ name ];


                        if ( value !== undefined ) {


                            switch ( value.length ) {


                                case 2:

                                    gl.vertexAttrib2fv( programAttribute.location, value );

                                    break;


                                case 3:

                                    gl.vertexAttrib3fv( programAttribute.location, value );

                                    break;


                                case 4:

                                    gl.vertexAttrib4fv( programAttribute.location, value );

                                    break;


                                default:

                                    gl.vertexAttrib1fv( programAttribute.location, value );


                            }


                        }


                    }


                }


            }


            disableUnusedAttributes();


        }


        function dispose() {


            reset();


            for ( const geometryId in bindingStates ) {


                const programMap = bindingStates[ geometryId ];


                for ( const programId in programMap ) {


                    const stateMap = programMap[ programId ];


                    for ( const wireframe in stateMap ) {


                        deleteVertexArrayObject( stateMap[ wireframe ].object );


                        delete stateMap[ wireframe ];


                    }


                    delete programMap[ programId ];


                }


                delete bindingStates[ geometryId ];


            }


        }


        function releaseStatesOfGeometry( geometry ) {


            if ( bindingStates[ geometry.id ] === undefined ) return;


            const programMap = bindingStates[ geometry.id ];


            for ( const programId in programMap ) {


                const stateMap = programMap[ programId ];


                for ( const wireframe in stateMap ) {


                    deleteVertexArrayObject( stateMap[ wireframe ].object );


                    delete stateMap[ wireframe ];


                }


                delete programMap[ programId ];


            }


            delete bindingStates[ geometry.id ];


        }


        function releaseStatesOfProgram( program ) {


            for ( const geometryId in bindingStates ) {


                const programMap = bindingStates[ geometryId ];


                if ( programMap[ program.id ] === undefined ) continue;


                const stateMap = programMap[ program.id ];


                for ( const wireframe in stateMap ) {


                    deleteVertexArrayObject( stateMap[ wireframe ].object );


                    delete stateMap[ wireframe ];


                }


                delete programMap[ program.id ];


            }


        }


        function reset() {


            resetDefaultState();

            forceUpdate = true;


            if ( currentState === defaultState ) return;


            currentState = defaultState;

            bindVertexArrayObject( currentState.object );


        }


        // for backward-compatibility


        function resetDefaultState() {


            defaultState.geometry = null;

            defaultState.program = null;

            defaultState.wireframe = false;


        }


        return {


            setup: setup,

            reset: reset,

            resetDefaultState: resetDefaultState,

            dispose: dispose,

            releaseStatesOfGeometry: releaseStatesOfGeometry,

            releaseStatesOfProgram: releaseStatesOfProgram,


            initAttributes: initAttributes,

            enableAttribute: enableAttribute,

            disableUnusedAttributes: disableUnusedAttributes


        };


    }


    function WebGLBufferRenderer( gl, extensions, info, capabilities ) {


        const isWebGL2 = capabilities.isWebGL2;


        let mode;


        function setMode( value ) {


            mode = value;


        }


        function render( start, count ) {


            gl.drawArrays( mode, start, count );


            info.update( count, mode, 1 );


        }


        function renderInstances( start, count, primcount ) {


            if ( primcount === 0 ) return;


            let extension, methodName;


            if ( isWebGL2 ) {


                extension = gl;

                methodName = 'drawArraysInstanced';


            } else {


                extension = extensions.get( 'ANGLE_instanced_arrays' );

                methodName = 'drawArraysInstancedANGLE';


                if ( extension === null ) {


                    console.error( 'THREE.WebGLBufferRenderer: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.' );

                    return;


                }


            }


            extension[ methodName ]( mode, start, count, primcount );


            info.update( count, mode, primcount );


        }


        function renderMultiDraw( starts, counts, drawCount ) {


            if ( drawCount === 0 ) return;


            const extension = extensions.get( 'WEBGL_multi_draw' );

            if ( extension === null ) {


                for ( let i = 0; i < drawCount; i ++ ) {


                    this.render( starts[ i ], counts[ i ] );


                }


            } else {


                extension.multiDrawArraysWEBGL( mode, starts, 0, counts, 0, drawCount );


                let elementCount = 0;

                for ( let i = 0; i < drawCount; i ++ ) {


                    elementCount += counts[ i ];


                }


                info.update( elementCount, mode, 1 );


            }


        }


        //


        this.setMode = setMode;

        this.render = render;

        this.renderInstances = renderInstances;

        this.renderMultiDraw = renderMultiDraw;


    }


    function WebGLCapabilities( gl, extensions, parameters ) {


        let maxAnisotropy;


        function getMaxAnisotropy() {


            if ( maxAnisotropy !== undefined ) return maxAnisotropy;


            if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {


                const extension = extensions.get( 'EXT_texture_filter_anisotropic' );


                maxAnisotropy = gl.getParameter( extension.MAX_TEXTURE_MAX_ANISOTROPY_EXT );


            } else {


                maxAnisotropy = 0;


            }


            return maxAnisotropy;


        }


        function getMaxPrecision( precision ) {


            if ( precision === 'highp' ) {


                if ( gl.getShaderPrecisionFormat( gl.VERTEX_SHADER, gl.HIGH_FLOAT ).precision > 0 &&

                    gl.getShaderPrecisionFormat( gl.FRAGMENT_SHADER, gl.HIGH_FLOAT ).precision > 0 ) {


                    return 'highp';


                }


                precision = 'mediump';


            }


            if ( precision === 'mediump' ) {


                if ( gl.getShaderPrecisionFormat( gl.VERTEX_SHADER, gl.MEDIUM_FLOAT ).precision > 0 &&

                    gl.getShaderPrecisionFormat( gl.FRAGMENT_SHADER, gl.MEDIUM_FLOAT ).precision > 0 ) {


                    return 'mediump';


                }


            }


            return 'lowp';


        }


        const isWebGL2 = typeof WebGL2RenderingContext !== 'undefined' && gl.constructor.name === 'WebGL2RenderingContext';


        let precision = parameters.precision !== undefined ? parameters.precision : 'highp';

        const maxPrecision = getMaxPrecision( precision );


        if ( maxPrecision !== precision ) {


            console.warn( 'THREE.WebGLRenderer:', precision, 'not supported, using', maxPrecision, 'instead.' );

            precision = maxPrecision;


        }


        const drawBuffers = isWebGL2 || extensions.has( 'WEBGL_draw_buffers' );


        const logarithmicDepthBuffer = parameters.logarithmicDepthBuffer === true;


        const maxTextures = gl.getParameter( gl.MAX_TEXTURE_IMAGE_UNITS );

        const maxVertexTextures = gl.getParameter( gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS );

        const maxTextureSize = gl.getParameter( gl.MAX_TEXTURE_SIZE );

        const maxCubemapSize = gl.getParameter( gl.MAX_CUBE_MAP_TEXTURE_SIZE );


        const maxAttributes = gl.getParameter( gl.MAX_VERTEX_ATTRIBS );

        const maxVertexUniforms = gl.getParameter( gl.MAX_VERTEX_UNIFORM_VECTORS );

        const maxVaryings = gl.getParameter( gl.MAX_VARYING_VECTORS );

        const maxFragmentUniforms = gl.getParameter( gl.MAX_FRAGMENT_UNIFORM_VECTORS );


        const vertexTextures = maxVertexTextures > 0;

        const floatFragmentTextures = isWebGL2 || extensions.has( 'OES_texture_float' );

        const floatVertexTextures = vertexTextures && floatFragmentTextures;


        const maxSamples = isWebGL2 ? gl.getParameter( gl.MAX_SAMPLES ) : 0;


        return {


            isWebGL2: isWebGL2,


            drawBuffers: drawBuffers,


            getMaxAnisotropy: getMaxAnisotropy,

            getMaxPrecision: getMaxPrecision,


            precision: precision,

            logarithmicDepthBuffer: logarithmicDepthBuffer,


            maxTextures: maxTextures,

            maxVertexTextures: maxVertexTextures,

            maxTextureSize: maxTextureSize,

            maxCubemapSize: maxCubemapSize,


            maxAttributes: maxAttributes,

            maxVertexUniforms: maxVertexUniforms,

            maxVaryings: maxVaryings,

            maxFragmentUniforms: maxFragmentUniforms,


            vertexTextures: vertexTextures,

            floatFragmentTextures: floatFragmentTextures,

            floatVertexTextures: floatVertexTextures,


            maxSamples: maxSamples


        };


    }


    function WebGLClipping( properties ) {


        const scope = this;


        let globalState = null,

            numGlobalPlanes = 0,

            localClippingEnabled = false,

            renderingShadows = false;


        const plane = new Plane(),

            viewNormalMatrix = new Matrix3(),


            uniform = { value: null, needsUpdate: false };


        this.uniform = uniform;

        this.numPlanes = 0;

        this.numIntersection = 0;


        this.init = function ( planes, enableLocalClipping ) {


            const enabled =

                planes.length !== 0 ||

                enableLocalClipping ||

                // enable state of previous frame - the clipping code has to

                // run another frame in order to reset the state:

                numGlobalPlanes !== 0 ||

                localClippingEnabled;


            localClippingEnabled = enableLocalClipping;


            numGlobalPlanes = planes.length;


            return enabled;


        };


        this.beginShadows = function () {


            renderingShadows = true;

            projectPlanes( null );


        };


        this.endShadows = function () {


            renderingShadows = false;


        };


        this.setGlobalState = function ( planes, camera ) {


            globalState = projectPlanes( planes, camera, 0 );


        };


        this.setState = function ( material, camera, useCache ) {


            const planes = material.clippingPlanes,

                clipIntersection = material.clipIntersection,

                clipShadows = material.clipShadows;


            const materialProperties = properties.get( material );


            if ( ! localClippingEnabled || planes === null || planes.length === 0 || renderingShadows && ! clipShadows ) {


                // there's no local clipping


                if ( renderingShadows ) {


                    // there's no global clipping


                    projectPlanes( null );


                } else {


                    resetGlobalState();


                }


            } else {


                const nGlobal = renderingShadows ? 0 : numGlobalPlanes,

                    lGlobal = nGlobal * 4;


                let dstArray = materialProperties.clippingState || null;


                uniform.value = dstArray; // ensure unique state


                dstArray = projectPlanes( planes, camera, lGlobal, useCache );


                for ( let i = 0; i !== lGlobal; ++ i ) {


                    dstArray[ i ] = globalState[ i ];


                }


                materialProperties.clippingState = dstArray;

                this.numIntersection = clipIntersection ? this.numPlanes : 0;

                this.numPlanes += nGlobal;


            }


        };


        function resetGlobalState() {


            if ( uniform.value !== globalState ) {


                uniform.value = globalState;

                uniform.needsUpdate = numGlobalPlanes > 0;


            }


            scope.numPlanes = numGlobalPlanes;

            scope.numIntersection = 0;


        }


        function projectPlanes( planes, camera, dstOffset, skipTransform ) {


            const nPlanes = planes !== null ? planes.length : 0;

            let dstArray = null;


            if ( nPlanes !== 0 ) {


                dstArray = uniform.value;


                if ( skipTransform !== true || dstArray === null ) {


                    const flatSize = dstOffset + nPlanes * 4,

                        viewMatrix = camera.matrixWorldInverse;


                    viewNormalMatrix.getNormalMatrix( viewMatrix );


                    if ( dstArray === null || dstArray.length < flatSize ) {


                        dstArray = new Float32Array( flatSize );


                    }


                    for ( let i = 0, i4 = dstOffset; i !== nPlanes; ++ i, i4 += 4 ) {


                        plane.copy( planes[ i ] ).applyMatrix4( viewMatrix, viewNormalMatrix );


                        plane.normal.toArray( dstArray, i4 );

                        dstArray[ i4 + 3 ] = plane.constant;


                    }


                }


                uniform.value = dstArray;

                uniform.needsUpdate = true;


            }


            scope.numPlanes = nPlanes;

            scope.numIntersection = 0;


            return dstArray;


        }


    }


    function WebGLCubeMaps( renderer ) {


        let cubemaps = new WeakMap();


        function mapTextureMapping( texture, mapping ) {


            if ( mapping === EquirectangularReflectionMapping ) {


                texture.mapping = CubeReflectionMapping;


            } else if ( mapping === EquirectangularRefractionMapping ) {


                texture.mapping = CubeRefractionMapping;


            }


            return texture;


        }


        function get( texture ) {


            if ( texture && texture.isTexture ) {


                const mapping = texture.mapping;


                if ( mapping === EquirectangularReflectionMapping || mapping === EquirectangularRefractionMapping ) {


                    if ( cubemaps.has( texture ) ) {


                        const cubemap = cubemaps.get( texture ).texture;

                        return mapTextureMapping( cubemap, texture.mapping );


                    } else {


                        const image = texture.image;


                        if ( image && image.height > 0 ) {


                            const renderTarget = new WebGLCubeRenderTarget( image.height / 2 );

                            renderTarget.fromEquirectangularTexture( renderer, texture );

                            cubemaps.set( texture, renderTarget );


                            texture.addEventListener( 'dispose', onTextureDispose );


                            return mapTextureMapping( renderTarget.texture, texture.mapping );


                        } else {


                            // image not yet ready. try the conversion next frame


                            return null;


                        }


                    }


                }


            }


            return texture;


        }


        function onTextureDispose( event ) {


            const texture = event.target;


            texture.removeEventListener( 'dispose', onTextureDispose );


            const cubemap = cubemaps.get( texture );


            if ( cubemap !== undefined ) {


                cubemaps.delete( texture );

                cubemap.dispose();


            }


        }


        function dispose() {


            cubemaps = new WeakMap();


        }


        return {

            get: get,

            dispose: dispose

        };


    }


    class OrthographicCamera extends Camera {


        constructor( left = - 1, right = 1, top = 1, bottom = - 1, near = 0.1, far = 2000 ) {


            super();


            this.isOrthographicCamera = true;


            this.type = 'OrthographicCamera';


            this.zoom = 1;

            this.view = null;


            this.left = left;

            this.right = right;

            this.top = top;

            this.bottom = bottom;


            this.near = near;

            this.far = far;


            this.updateProjectionMatrix();


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.left = source.left;

            this.right = source.right;

            this.top = source.top;

            this.bottom = source.bottom;

            this.near = source.near;

            this.far = source.far;


            this.zoom = source.zoom;

            this.view = source.view === null ? null : Object.assign( {}, source.view );


            return this;


        }


        setViewOffset( fullWidth, fullHeight, x, y, width, height ) {


            if ( this.view === null ) {


                this.view = {

                    enabled: true,

                    fullWidth: 1,

                    fullHeight: 1,

                    offsetX: 0,

                    offsetY: 0,

                    width: 1,

                    height: 1

                };


            }


            this.view.enabled = true;

            this.view.fullWidth = fullWidth;

            this.view.fullHeight = fullHeight;

            this.view.offsetX = x;

            this.view.offsetY = y;

            this.view.width = width;

            this.view.height = height;


            this.updateProjectionMatrix();


        }


        clearViewOffset() {


            if ( this.view !== null ) {


                this.view.enabled = false;


            }


            this.updateProjectionMatrix();


        }


        updateProjectionMatrix() {


            const dx = ( this.right - this.left ) / ( 2 * this.zoom );

            const dy = ( this.top - this.bottom ) / ( 2 * this.zoom );

            const cx = ( this.right + this.left ) / 2;

            const cy = ( this.top + this.bottom ) / 2;


            let left = cx - dx;

            let right = cx + dx;

            let top = cy + dy;

            let bottom = cy - dy;


            if ( this.view !== null && this.view.enabled ) {


                const scaleW = ( this.right - this.left ) / this.view.fullWidth / this.zoom;

                const scaleH = ( this.top - this.bottom ) / this.view.fullHeight / this.zoom;


                left += scaleW * this.view.offsetX;

                right = left + scaleW * this.view.width;

                top -= scaleH * this.view.offsetY;

                bottom = top - scaleH * this.view.height;


            }


            this.projectionMatrix.makeOrthographic( left, right, top, bottom, this.near, this.far, this.coordinateSystem );


            this.projectionMatrixInverse.copy( this.projectionMatrix ).invert();


        }


        toJSON( meta ) {


            const data = super.toJSON( meta );


            data.object.zoom = this.zoom;

            data.object.left = this.left;

            data.object.right = this.right;

            data.object.top = this.top;

            data.object.bottom = this.bottom;

            data.object.near = this.near;

            data.object.far = this.far;


            if ( this.view !== null ) data.object.view = Object.assign( {}, this.view );


            return data;


        }


    }


    const LOD_MIN = 4;


    // The standard deviations (radians) associated with the extra mips. These are

    // chosen to approximate a Trowbridge-Reitz distribution function times the

    // geometric shadowing function. These sigma values squared must match the

    // variance #defines in cube_uv_reflection_fragment.glsl.js.

    const EXTRA_LOD_SIGMA = [ 0.125, 0.215, 0.35, 0.446, 0.526, 0.582 ];


    // The maximum length of the blur for loop. Smaller sigmas will use fewer

    // samples and exit early, but not recompile the shader.

    const MAX_SAMPLES = 20;


    const _flatCamera = /*@__PURE__*/ new OrthographicCamera();

    const _clearColor = /*@__PURE__*/ new Color();

    let _oldTarget = null;

    let _oldActiveCubeFace = 0;

    let _oldActiveMipmapLevel = 0;


    // Golden Ratio

    const PHI = ( 1 + Math.sqrt( 5 ) ) / 2;

    const INV_PHI = 1 / PHI;


    // Vertices of a dodecahedron (except the opposites, which represent the

    // same axis), used as axis directions evenly spread on a sphere.

    const _axisDirections = [

        /*@__PURE__*/ new Vector3( 1, 1, 1 ),

        /*@__PURE__*/ new Vector3( - 1, 1, 1 ),

        /*@__PURE__*/ new Vector3( 1, 1, - 1 ),

        /*@__PURE__*/ new Vector3( - 1, 1, - 1 ),

        /*@__PURE__*/ new Vector3( 0, PHI, INV_PHI ),

        /*@__PURE__*/ new Vector3( 0, PHI, - INV_PHI ),

        /*@__PURE__*/ new Vector3( INV_PHI, 0, PHI ),

        /*@__PURE__*/ new Vector3( - INV_PHI, 0, PHI ),

        /*@__PURE__*/ new Vector3( PHI, INV_PHI, 0 ),

        /*@__PURE__*/ new Vector3( - PHI, INV_PHI, 0 ) ];


    class PMREMGenerator {


        constructor( renderer ) {


            this._renderer = renderer;

            this._pingPongRenderTarget = null;


            this._lodMax = 0;

            this._cubeSize = 0;

            this._lodPlanes = [];

            this._sizeLods = [];

            this._sigmas = [];


            this._blurMaterial = null;

            this._cubemapMaterial = null;

            this._equirectMaterial = null;


            this._compileMaterial( this._blurMaterial );


        }


        fromScene( scene, sigma = 0, near = 0.1, far = 100 ) {


            _oldTarget = this._renderer.getRenderTarget();

            _oldActiveCubeFace = this._renderer.getActiveCubeFace();

            _oldActiveMipmapLevel = this._renderer.getActiveMipmapLevel();


            this._setSize( 256 );


            const cubeUVRenderTarget = this._allocateTargets();

            cubeUVRenderTarget.depthBuffer = true;


            this._sceneToCubeUV( scene, near, far, cubeUVRenderTarget );


            if ( sigma > 0 ) {


                this._blur( cubeUVRenderTarget, 0, 0, sigma );


            }


            this._applyPMREM( cubeUVRenderTarget );

            this._cleanup( cubeUVRenderTarget );


            return cubeUVRenderTarget;


        }


        fromEquirectangular( equirectangular, renderTarget = null ) {


            return this._fromTexture( equirectangular, renderTarget );


        }


        fromCubemap( cubemap, renderTarget = null ) {


            return this._fromTexture( cubemap, renderTarget );


        }


        compileCubemapShader() {


            if ( this._cubemapMaterial === null ) {


                this._cubemapMaterial = _getCubemapMaterial();

                this._compileMaterial( this._cubemapMaterial );


            }


        }


        compileEquirectangularShader() {


            if ( this._equirectMaterial === null ) {


                this._equirectMaterial = _getEquirectMaterial();

                this._compileMaterial( this._equirectMaterial );


            }


        }


        dispose() {


            this._dispose();


            if ( this._cubemapMaterial !== null ) this._cubemapMaterial.dispose();

            if ( this._equirectMaterial !== null ) this._equirectMaterial.dispose();


        }


        // private interface


        _setSize( cubeSize ) {


            this._lodMax = Math.floor( Math.log2( cubeSize ) );

            this._cubeSize = Math.pow( 2, this._lodMax );


        }


        _dispose() {


            if ( this._blurMaterial !== null ) this._blurMaterial.dispose();


            if ( this._pingPongRenderTarget !== null ) this._pingPongRenderTarget.dispose();


            for ( let i = 0; i < this._lodPlanes.length; i ++ ) {


                this._lodPlanes[ i ].dispose();


            }


        }


        _cleanup( outputTarget ) {


            this._renderer.setRenderTarget( _oldTarget, _oldActiveCubeFace, _oldActiveMipmapLevel );

            outputTarget.scissorTest = false;

            _setViewport( outputTarget, 0, 0, outputTarget.width, outputTarget.height );


        }


        _fromTexture( texture, renderTarget ) {


            if ( texture.mapping === CubeReflectionMapping || texture.mapping === CubeRefractionMapping ) {


                this._setSize( texture.image.length === 0 ? 16 : ( texture.image[ 0 ].width || texture.image[ 0 ].image.width ) );


            } else { // Equirectangular


                this._setSize( texture.image.width / 4 );


            }


            _oldTarget = this._renderer.getRenderTarget();

            _oldActiveCubeFace = this._renderer.getActiveCubeFace();

            _oldActiveMipmapLevel = this._renderer.getActiveMipmapLevel();


            const cubeUVRenderTarget = renderTarget || this._allocateTargets();

            this._textureToCubeUV( texture, cubeUVRenderTarget );

            this._applyPMREM( cubeUVRenderTarget );

            this._cleanup( cubeUVRenderTarget );


            return cubeUVRenderTarget;


        }


        _allocateTargets() {


            const width = 3 * Math.max( this._cubeSize, 16 * 7 );

            const height = 4 * this._cubeSize;


            const params = {

                magFilter: LinearFilter,

                minFilter: LinearFilter,

                generateMipmaps: false,

                type: HalfFloatType,

                format: RGBAFormat,

                colorSpace: LinearSRGBColorSpace,

                depthBuffer: false

            };


            const cubeUVRenderTarget = _createRenderTarget( width, height, params );


            if ( this._pingPongRenderTarget === null || this._pingPongRenderTarget.width !== width || this._pingPongRenderTarget.height !== height ) {


                if ( this._pingPongRenderTarget !== null ) {


                    this._dispose();


                }


                this._pingPongRenderTarget = _createRenderTarget( width, height, params );


                const { _lodMax } = this;

                ( { sizeLods: this._sizeLods, lodPlanes: this._lodPlanes, sigmas: this._sigmas } = _createPlanes( _lodMax ) );


                this._blurMaterial = _getBlurShader( _lodMax, width, height );


            }


            return cubeUVRenderTarget;


        }


        _compileMaterial( material ) {


            const tmpMesh = new Mesh( this._lodPlanes[ 0 ], material );

            this._renderer.compile( tmpMesh, _flatCamera );


        }


        _sceneToCubeUV( scene, near, far, cubeUVRenderTarget ) {


            const fov = 90;

            const aspect = 1;

            const cubeCamera = new PerspectiveCamera( fov, aspect, near, far );

            const upSign = [ 1, - 1, 1, 1, 1, 1 ];

            const forwardSign = [ 1, 1, 1, - 1, - 1, - 1 ];

            const renderer = this._renderer;


            const originalAutoClear = renderer.autoClear;

            const toneMapping = renderer.toneMapping;

            renderer.getClearColor( _clearColor );


            renderer.toneMapping = NoToneMapping;

            renderer.autoClear = false;


            const backgroundMaterial = new MeshBasicMaterial( {

                name: 'PMREM.Background',

                side: BackSide,

                depthWrite: false,

                depthTest: false,

            } );


            const backgroundBox = new Mesh( new BoxGeometry(), backgroundMaterial );


            let useSolidColor = false;

            const background = scene.background;


            if ( background ) {


                if ( background.isColor ) {


                    backgroundMaterial.color.copy( background );

                    scene.background = null;

                    useSolidColor = true;


                }


            } else {


                backgroundMaterial.color.copy( _clearColor );

                useSolidColor = true;


            }


            for ( let i = 0; i < 6; i ++ ) {


                const col = i % 3;


                if ( col === 0 ) {


                    cubeCamera.up.set( 0, upSign[ i ], 0 );

                    cubeCamera.lookAt( forwardSign[ i ], 0, 0 );


                } else if ( col === 1 ) {


                    cubeCamera.up.set( 0, 0, upSign[ i ] );

                    cubeCamera.lookAt( 0, forwardSign[ i ], 0 );


                } else {


                    cubeCamera.up.set( 0, upSign[ i ], 0 );

                    cubeCamera.lookAt( 0, 0, forwardSign[ i ] );


                }


                const size = this._cubeSize;


                _setViewport( cubeUVRenderTarget, col * size, i > 2 ? size : 0, size, size );


                renderer.setRenderTarget( cubeUVRenderTarget );


                if ( useSolidColor ) {


                    renderer.render( backgroundBox, cubeCamera );


                }


                renderer.render( scene, cubeCamera );


            }


            backgroundBox.geometry.dispose();

            backgroundBox.material.dispose();


            renderer.toneMapping = toneMapping;

            renderer.autoClear = originalAutoClear;

            scene.background = background;


        }


        _textureToCubeUV( texture, cubeUVRenderTarget ) {


            const renderer = this._renderer;


            const isCubeTexture = ( texture.mapping === CubeReflectionMapping || texture.mapping === CubeRefractionMapping );


            if ( isCubeTexture ) {


                if ( this._cubemapMaterial === null ) {


                    this._cubemapMaterial = _getCubemapMaterial();


                }


                this._cubemapMaterial.uniforms.flipEnvMap.value = ( texture.isRenderTargetTexture === false ) ? - 1 : 1;


            } else {


                if ( this._equirectMaterial === null ) {


                    this._equirectMaterial = _getEquirectMaterial();


                }


            }


            const material = isCubeTexture ? this._cubemapMaterial : this._equirectMaterial;

            const mesh = new Mesh( this._lodPlanes[ 0 ], material );


            const uniforms = material.uniforms;


            uniforms[ 'envMap' ].value = texture;


            const size = this._cubeSize;


            _setViewport( cubeUVRenderTarget, 0, 0, 3 * size, 2 * size );


            renderer.setRenderTarget( cubeUVRenderTarget );

            renderer.render( mesh, _flatCamera );


        }


        _applyPMREM( cubeUVRenderTarget ) {


            const renderer = this._renderer;

            const autoClear = renderer.autoClear;

            renderer.autoClear = false;


            for ( let i = 1; i < this._lodPlanes.length; i ++ ) {


                const sigma = Math.sqrt( this._sigmas[ i ] * this._sigmas[ i ] - this._sigmas[ i - 1 ] * this._sigmas[ i - 1 ] );


                const poleAxis = _axisDirections[ ( i - 1 ) % _axisDirections.length ];


                this._blur( cubeUVRenderTarget, i - 1, i, sigma, poleAxis );


            }


            renderer.autoClear = autoClear;


        }


        _blur( cubeUVRenderTarget, lodIn, lodOut, sigma, poleAxis ) {


            const pingPongRenderTarget = this._pingPongRenderTarget;


            this._halfBlur(

                cubeUVRenderTarget,

                pingPongRenderTarget,

                lodIn,

                lodOut,

                sigma,

                'latitudinal',

                poleAxis );


            this._halfBlur(

                pingPongRenderTarget,

                cubeUVRenderTarget,

                lodOut,

                lodOut,

                sigma,

                'longitudinal',

                poleAxis );


        }


        _halfBlur( targetIn, targetOut, lodIn, lodOut, sigmaRadians, direction, poleAxis ) {


            const renderer = this._renderer;

            const blurMaterial = this._blurMaterial;


            if ( direction !== 'latitudinal' && direction !== 'longitudinal' ) {


                console.error(

                    'blur direction must be either latitudinal or longitudinal!' );


            }


            // Number of standard deviations at which to cut off the discrete approximation.

            const STANDARD_DEVIATIONS = 3;


            const blurMesh = new Mesh( this._lodPlanes[ lodOut ], blurMaterial );

            const blurUniforms = blurMaterial.uniforms;


            const pixels = this._sizeLods[ lodIn ] - 1;

            const radiansPerPixel = isFinite( sigmaRadians ) ? Math.PI / ( 2 * pixels ) : 2 * Math.PI / ( 2 * MAX_SAMPLES - 1 );

            const sigmaPixels = sigmaRadians / radiansPerPixel;

            const samples = isFinite( sigmaRadians ) ? 1 + Math.floor( STANDARD_DEVIATIONS * sigmaPixels ) : MAX_SAMPLES;


            if ( samples > MAX_SAMPLES ) {


                console.warn( `sigmaRadians, ${

                sigmaRadians}, is too large and will clip, as it requested ${

                samples} samples when the maximum is set to ${MAX_SAMPLES}` );


            }


            const weights = [];

            let sum = 0;


            for ( let i = 0; i < MAX_SAMPLES; ++ i ) {


                const x = i / sigmaPixels;

                const weight = Math.exp( - x * x / 2 );

                weights.push( weight );


                if ( i === 0 ) {


                    sum += weight;


                } else if ( i < samples ) {


                    sum += 2 * weight;


                }


            }


            for ( let i = 0; i < weights.length; i ++ ) {


                weights[ i ] = weights[ i ] / sum;


            }


            blurUniforms[ 'envMap' ].value = targetIn.texture;

            blurUniforms[ 'samples' ].value = samples;

            blurUniforms[ 'weights' ].value = weights;

            blurUniforms[ 'latitudinal' ].value = direction === 'latitudinal';


            if ( poleAxis ) {


                blurUniforms[ 'poleAxis' ].value = poleAxis;


            }


            const { _lodMax } = this;

            blurUniforms[ 'dTheta' ].value = radiansPerPixel;

            blurUniforms[ 'mipInt' ].value = _lodMax - lodIn;


            const outputSize = this._sizeLods[ lodOut ];

            const x = 3 * outputSize * ( lodOut > _lodMax - LOD_MIN ? lodOut - _lodMax + LOD_MIN : 0 );

            const y = 4 * ( this._cubeSize - outputSize );


            _setViewport( targetOut, x, y, 3 * outputSize, 2 * outputSize );

            renderer.setRenderTarget( targetOut );

            renderer.render( blurMesh, _flatCamera );


        }


    }


    function _createPlanes( lodMax ) {


        const lodPlanes = [];

        const sizeLods = [];

        const sigmas = [];


        let lod = lodMax;


        const totalLods = lodMax - LOD_MIN + 1 + EXTRA_LOD_SIGMA.length;


        for ( let i = 0; i < totalLods; i ++ ) {


            const sizeLod = Math.pow( 2, lod );

            sizeLods.push( sizeLod );

            let sigma = 1.0 / sizeLod;


            if ( i > lodMax - LOD_MIN ) {


                sigma = EXTRA_LOD_SIGMA[ i - lodMax + LOD_MIN - 1 ];


            } else if ( i === 0 ) {


                sigma = 0;


            }


            sigmas.push( sigma );


            const texelSize = 1.0 / ( sizeLod - 2 );

            const min = - texelSize;

            const max = 1 + texelSize;

            const uv1 = [ min, min, max, min, max, max, min, min, max, max, min, max ];


            const cubeFaces = 6;

            const vertices = 6;

            const positionSize = 3;

            const uvSize = 2;

            const faceIndexSize = 1;


            const position = new Float32Array( positionSize * vertices * cubeFaces );

            const uv = new Float32Array( uvSize * vertices * cubeFaces );

            const faceIndex = new Float32Array( faceIndexSize * vertices * cubeFaces );


            for ( let face = 0; face < cubeFaces; face ++ ) {


                const x = ( face % 3 ) * 2 / 3 - 1;

                const y = face > 2 ? 0 : - 1;

                const coordinates = [

                    x, y, 0,

                    x + 2 / 3, y, 0,

                    x + 2 / 3, y + 1, 0,

                    x, y, 0,

                    x + 2 / 3, y + 1, 0,

                    x, y + 1, 0

                ];

                position.set( coordinates, positionSize * vertices * face );

                uv.set( uv1, uvSize * vertices * face );

                const fill = [ face, face, face, face, face, face ];

                faceIndex.set( fill, faceIndexSize * vertices * face );


            }


            const planes = new BufferGeometry();

            planes.setAttribute( 'position', new BufferAttribute( position, positionSize ) );

            planes.setAttribute( 'uv', new BufferAttribute( uv, uvSize ) );

            planes.setAttribute( 'faceIndex', new BufferAttribute( faceIndex, faceIndexSize ) );

            lodPlanes.push( planes );


            if ( lod > LOD_MIN ) {


                lod --;


            }


        }


        return { lodPlanes, sizeLods, sigmas };


    }


    function _createRenderTarget( width, height, params ) {


        const cubeUVRenderTarget = new WebGLRenderTarget( width, height, params );

        cubeUVRenderTarget.texture.mapping = CubeUVReflectionMapping;

        cubeUVRenderTarget.texture.name = 'PMREM.cubeUv';

        cubeUVRenderTarget.scissorTest = true;

        return cubeUVRenderTarget;


    }


    function _setViewport( target, x, y, width, height ) {


        target.viewport.set( x, y, width, height );

        target.scissor.set( x, y, width, height );


    }


    function _getBlurShader( lodMax, width, height ) {


        const weights = new Float32Array( MAX_SAMPLES );

        const poleAxis = new Vector3( 0, 1, 0 );

        const shaderMaterial = new ShaderMaterial( {


            name: 'SphericalGaussianBlur',


            defines: {

                'n': MAX_SAMPLES,

                'CUBEUV_TEXEL_WIDTH': 1.0 / width,

                'CUBEUV_TEXEL_HEIGHT': 1.0 / height,

                'CUBEUV_MAX_MIP': `${lodMax}.0`,

            },


            uniforms: {

                'envMap': { value: null },

                'samples': { value: 1 },

                'weights': { value: weights },

                'latitudinal': { value: false },

                'dTheta': { value: 0 },

                'mipInt': { value: 0 },

                'poleAxis': { value: poleAxis }

            },


            vertexShader: _getCommonVertexShader(),


            fragmentShader: /* glsl */`


            precision mediump float;

            precision mediump int;


            varying vec3 vOutputDirection;


            uniform sampler2D envMap;

            uniform int samples;

            uniform float weights[ n ];

            uniform bool latitudinal;

            uniform float dTheta;

            uniform float mipInt;

            uniform vec3 poleAxis;


            #define ENVMAP_TYPE_CUBE_UV

            #include <cube_uv_reflection_fragment>


            vec3 getSample( float theta, vec3 axis ) {


                float cosTheta = cos( theta );

                // Rodrigues' axis-angle rotation

                vec3 sampleDirection = vOutputDirection * cosTheta

                    + cross( axis, vOutputDirection ) * sin( theta )

                    + axis * dot( axis, vOutputDirection ) * ( 1.0 - cosTheta );


                return bilinearCubeUV( envMap, sampleDirection, mipInt );


            }


            void main() {


                vec3 axis = latitudinal ? poleAxis : cross( poleAxis, vOutputDirection );


                if ( all( equal( axis, vec3( 0.0 ) ) ) ) {


                    axis = vec3( vOutputDirection.z, 0.0, - vOutputDirection.x );


                }


                axis = normalize( axis );


                gl_FragColor = vec4( 0.0, 0.0, 0.0, 1.0 );

                gl_FragColor.rgb += weights[ 0 ] * getSample( 0.0, axis );


                for ( int i = 1; i < n; i++ ) {


                    if ( i >= samples ) {


                        break;


                    }


                    float theta = dTheta * float( i );

                    gl_FragColor.rgb += weights[ i ] * getSample( -1.0 * theta, axis );

                    gl_FragColor.rgb += weights[ i ] * getSample( theta, axis );


                }


            }

        `,


            blending: NoBlending,

            depthTest: false,

            depthWrite: false


        } );


        return shaderMaterial;


    }


    function _getEquirectMaterial() {


        return new ShaderMaterial( {


            name: 'EquirectangularToCubeUV',


            uniforms: {

                'envMap': { value: null }

            },


            vertexShader: _getCommonVertexShader(),


            fragmentShader: /* glsl */`


            precision mediump float;

            precision mediump int;


            varying vec3 vOutputDirection;


            uniform sampler2D envMap;


            #include <common>


            void main() {


                vec3 outputDirection = normalize( vOutputDirection );

                vec2 uv = equirectUv( outputDirection );


                gl_FragColor = vec4( texture2D ( envMap, uv ).rgb, 1.0 );


            }

        `,


            blending: NoBlending,

            depthTest: false,

            depthWrite: false


        } );


    }


    function _getCubemapMaterial() {


        return new ShaderMaterial( {


            name: 'CubemapToCubeUV',


            uniforms: {

                'envMap': { value: null },

                'flipEnvMap': { value: - 1 }

            },


            vertexShader: _getCommonVertexShader(),


            fragmentShader: /* glsl */`


            precision mediump float;

            precision mediump int;


            uniform float flipEnvMap;


            varying vec3 vOutputDirection;


            uniform samplerCube envMap;


            void main() {


                gl_FragColor = textureCube( envMap, vec3( flipEnvMap * vOutputDirection.x, vOutputDirection.yz ) );


            }

        `,


            blending: NoBlending,

            depthTest: false,

            depthWrite: false


        } );


    }


    function _getCommonVertexShader() {


        return /* glsl */`


        precision mediump float;

        precision mediump int;


        attribute float faceIndex;


        varying vec3 vOutputDirection;


        // RH coordinate system; PMREM face-indexing convention

        vec3 getDirection( vec2 uv, float face ) {


            uv = 2.0 * uv - 1.0;


            vec3 direction = vec3( uv, 1.0 );


            if ( face == 0.0 ) {


                direction = direction.zyx; // ( 1, v, u ) pos x


            } else if ( face == 1.0 ) {


                direction = direction.xzy;

                direction.xz *= -1.0; // ( -u, 1, -v ) pos y


            } else if ( face == 2.0 ) {


                direction.x *= -1.0; // ( -u, v, 1 ) pos z


            } else if ( face == 3.0 ) {


                direction = direction.zyx;

                direction.xz *= -1.0; // ( -1, v, -u ) neg x


            } else if ( face == 4.0 ) {


                direction = direction.xzy;

                direction.xy *= -1.0; // ( -u, -1, v ) neg y


            } else if ( face == 5.0 ) {


                direction.z *= -1.0; // ( u, v, -1 ) neg z


            }


            return direction;


        }


        void main() {


            vOutputDirection = getDirection( uv, faceIndex );

            gl_Position = vec4( position, 1.0 );


        }

    `;


    }


    function WebGLCubeUVMaps( renderer ) {


        let cubeUVmaps = new WeakMap();


        let pmremGenerator = null;


        function get( texture ) {


            if ( texture && texture.isTexture ) {


                const mapping = texture.mapping;


                const isEquirectMap = ( mapping === EquirectangularReflectionMapping || mapping === EquirectangularRefractionMapping );

                const isCubeMap = ( mapping === CubeReflectionMapping || mapping === CubeRefractionMapping );


                // equirect/cube map to cubeUV conversion


                if ( isEquirectMap || isCubeMap ) {


                    if ( texture.isRenderTargetTexture && texture.needsPMREMUpdate === true ) {


                        texture.needsPMREMUpdate = false;


                        let renderTarget = cubeUVmaps.get( texture );


                        if ( pmremGenerator === null ) pmremGenerator = new PMREMGenerator( renderer );


                        renderTarget = isEquirectMap ? pmremGenerator.fromEquirectangular( texture, renderTarget ) : pmremGenerator.fromCubemap( texture, renderTarget );

                        cubeUVmaps.set( texture, renderTarget );


                        return renderTarget.texture;


                    } else {


                        if ( cubeUVmaps.has( texture ) ) {


                            return cubeUVmaps.get( texture ).texture;


                        } else {


                            const image = texture.image;


                            if ( ( isEquirectMap && image && image.height > 0 ) || ( isCubeMap && image && isCubeTextureComplete( image ) ) ) {


                                if ( pmremGenerator === null ) pmremGenerator = new PMREMGenerator( renderer );


                                const renderTarget = isEquirectMap ? pmremGenerator.fromEquirectangular( texture ) : pmremGenerator.fromCubemap( texture );

                                cubeUVmaps.set( texture, renderTarget );


                                texture.addEventListener( 'dispose', onTextureDispose );


                                return renderTarget.texture;


                            } else {


                                // image not yet ready. try the conversion next frame


                                return null;


                            }


                        }


                    }


                }


            }


            return texture;


        }


        function isCubeTextureComplete( image ) {


            let count = 0;

            const length = 6;


            for ( let i = 0; i < length; i ++ ) {


                if ( image[ i ] !== undefined ) count ++;


            }


            return count === length;


        }


        function onTextureDispose( event ) {


            const texture = event.target;


            texture.removeEventListener( 'dispose', onTextureDispose );


            const cubemapUV = cubeUVmaps.get( texture );


            if ( cubemapUV !== undefined ) {


                cubeUVmaps.delete( texture );

                cubemapUV.dispose();


            }


        }


        function dispose() {


            cubeUVmaps = new WeakMap();


            if ( pmremGenerator !== null ) {


                pmremGenerator.dispose();

                pmremGenerator = null;


            }


        }


        return {

            get: get,

            dispose: dispose

        };


    }


    function WebGLExtensions( gl ) {


        const extensions = {};


        function getExtension( name ) {


            if ( extensions[ name ] !== undefined ) {


                return extensions[ name ];


            }


            let extension;


            switch ( name ) {


                case 'WEBGL_depth_texture':

                    extension = gl.getExtension( 'WEBGL_depth_texture' ) || gl.getExtension( 'MOZ_WEBGL_depth_texture' ) || gl.getExtension( 'WEBKIT_WEBGL_depth_texture' );

                    break;


                case 'EXT_texture_filter_anisotropic':

                    extension = gl.getExtension( 'EXT_texture_filter_anisotropic' ) || gl.getExtension( 'MOZ_EXT_texture_filter_anisotropic' ) || gl.getExtension( 'WEBKIT_EXT_texture_filter_anisotropic' );

                    break;


                case 'WEBGL_compressed_texture_s3tc':

                    extension = gl.getExtension( 'WEBGL_compressed_texture_s3tc' ) || gl.getExtension( 'MOZ_WEBGL_compressed_texture_s3tc' ) || gl.getExtension( 'WEBKIT_WEBGL_compressed_texture_s3tc' );

                    break;


                case 'WEBGL_compressed_texture_pvrtc':

                    extension = gl.getExtension( 'WEBGL_compressed_texture_pvrtc' ) || gl.getExtension( 'WEBKIT_WEBGL_compressed_texture_pvrtc' );

                    break;


                default:

                    extension = gl.getExtension( name );


            }


            extensions[ name ] = extension;


            return extension;


        }


        return {


            has: function ( name ) {


                return getExtension( name ) !== null;


            },


            init: function ( capabilities ) {


                if ( capabilities.isWebGL2 ) {


                    getExtension( 'EXT_color_buffer_float' );

                    getExtension( 'WEBGL_clip_cull_distance' );


                } else {


                    getExtension( 'WEBGL_depth_texture' );

                    getExtension( 'OES_texture_float' );

                    getExtension( 'OES_texture_half_float' );

                    getExtension( 'OES_texture_half_float_linear' );

                    getExtension( 'OES_standard_derivatives' );

                    getExtension( 'OES_element_index_uint' );

                    getExtension( 'OES_vertex_array_object' );

                    getExtension( 'ANGLE_instanced_arrays' );


                }


                getExtension( 'OES_texture_float_linear' );

                getExtension( 'EXT_color_buffer_half_float' );

                getExtension( 'WEBGL_multisampled_render_to_texture' );


            },


            get: function ( name ) {


                const extension = getExtension( name );


                if ( extension === null ) {


                    console.warn( 'THREE.WebGLRenderer: ' + name + ' extension not supported.' );


                }


                return extension;


            }


        };


    }


    function WebGLGeometries( gl, attributes, info, bindingStates ) {


        const geometries = {};

        const wireframeAttributes = new WeakMap();


        function onGeometryDispose( event ) {


            const geometry = event.target;


            if ( geometry.index !== null ) {


                attributes.remove( geometry.index );


            }


            for ( const name in geometry.attributes ) {


                attributes.remove( geometry.attributes[ name ] );


            }


            for ( const name in geometry.morphAttributes ) {


                const array = geometry.morphAttributes[ name ];


                for ( let i = 0, l = array.length; i < l; i ++ ) {


                    attributes.remove( array[ i ] );


                }


            }


            geometry.removeEventListener( 'dispose', onGeometryDispose );


            delete geometries[ geometry.id ];


            const attribute = wireframeAttributes.get( geometry );


            if ( attribute ) {


                attributes.remove( attribute );

                wireframeAttributes.delete( geometry );


            }


            bindingStates.releaseStatesOfGeometry( geometry );


            if ( geometry.isInstancedBufferGeometry === true ) {


                delete geometry._maxInstanceCount;


            }


            //


            info.memory.geometries --;


        }


        function get( object, geometry ) {


            if ( geometries[ geometry.id ] === true ) return geometry;


            geometry.addEventListener( 'dispose', onGeometryDispose );


            geometries[ geometry.id ] = true;


            info.memory.geometries ++;


            return geometry;


        }


        function update( geometry ) {


            const geometryAttributes = geometry.attributes;


            // Updating index buffer in VAO now. See WebGLBindingStates.


            for ( const name in geometryAttributes ) {


                attributes.update( geometryAttributes[ name ], gl.ARRAY_BUFFER );


            }


            // morph targets


            const morphAttributes = geometry.morphAttributes;


            for ( const name in morphAttributes ) {


                const array = morphAttributes[ name ];


                for ( let i = 0, l = array.length; i < l; i ++ ) {


                    attributes.update( array[ i ], gl.ARRAY_BUFFER );


                }


            }


        }


        function updateWireframeAttribute( geometry ) {


            const indices = [];


            const geometryIndex = geometry.index;

            const geometryPosition = geometry.attributes.position;

            let version = 0;


            if ( geometryIndex !== null ) {


                const array = geometryIndex.array;

                version = geometryIndex.version;


                for ( let i = 0, l = array.length; i < l; i += 3 ) {


                    const a = array[ i + 0 ];

                    const b = array[ i + 1 ];

                    const c = array[ i + 2 ];


                    indices.push( a, b, b, c, c, a );


                }


            } else if ( geometryPosition !== undefined ) {


                const array = geometryPosition.array;

                version = geometryPosition.version;


                for ( let i = 0, l = ( array.length / 3 ) - 1; i < l; i += 3 ) {


                    const a = i + 0;

                    const b = i + 1;

                    const c = i + 2;


                    indices.push( a, b, b, c, c, a );


                }


            } else {


                return;


            }


            const attribute = new ( arrayNeedsUint32( indices ) ? Uint32BufferAttribute : Uint16BufferAttribute )( indices, 1 );

            attribute.version = version;


            // Updating index buffer in VAO now. See WebGLBindingStates


            //


            const previousAttribute = wireframeAttributes.get( geometry );


            if ( previousAttribute ) attributes.remove( previousAttribute );


            //


            wireframeAttributes.set( geometry, attribute );


        }


        function getWireframeAttribute( geometry ) {


            const currentAttribute = wireframeAttributes.get( geometry );


            if ( currentAttribute ) {


                const geometryIndex = geometry.index;


                if ( geometryIndex !== null ) {


                    // if the attribute is obsolete, create a new one


                    if ( currentAttribute.version < geometryIndex.version ) {


                        updateWireframeAttribute( geometry );


                    }


                }


            } else {


                updateWireframeAttribute( geometry );


            }


            return wireframeAttributes.get( geometry );


        }


        return {


            get: get,

            update: update,


            getWireframeAttribute: getWireframeAttribute


        };


    }


    function WebGLIndexedBufferRenderer( gl, extensions, info, capabilities ) {


        const isWebGL2 = capabilities.isWebGL2;


        let mode;


        function setMode( value ) {


            mode = value;


        }


        let type, bytesPerElement;


        function setIndex( value ) {


            type = value.type;

            bytesPerElement = value.bytesPerElement;


        }


        function render( start, count ) {


            gl.drawElements( mode, count, type, start * bytesPerElement );


            info.update( count, mode, 1 );


        }


        function renderInstances( start, count, primcount ) {


            if ( primcount === 0 ) return;


            let extension, methodName;


            if ( isWebGL2 ) {


                extension = gl;

                methodName = 'drawElementsInstanced';


            } else {


                extension = extensions.get( 'ANGLE_instanced_arrays' );

                methodName = 'drawElementsInstancedANGLE';


                if ( extension === null ) {


                    console.error( 'THREE.WebGLIndexedBufferRenderer: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.' );

                    return;


                }


            }


            extension[ methodName ]( mode, count, type, start * bytesPerElement, primcount );


            info.update( count, mode, primcount );


        }


        function renderMultiDraw( starts, counts, drawCount ) {


            if ( drawCount === 0 ) return;


            const extension = extensions.get( 'WEBGL_multi_draw' );

            if ( extension === null ) {


                for ( let i = 0; i < drawCount; i ++ ) {


                    this.render( starts[ i ] / bytesPerElement, counts[ i ] );


                }


            } else {


                extension.multiDrawElementsWEBGL( mode, counts, 0, type, starts, 0, drawCount );


                let elementCount = 0;

                for ( let i = 0; i < drawCount; i ++ ) {


                    elementCount += counts[ i ];


                }


                info.update( elementCount, mode, 1 );


            }


        }


        //


        this.setMode = setMode;

        this.setIndex = setIndex;

        this.render = render;

        this.renderInstances = renderInstances;

        this.renderMultiDraw = renderMultiDraw;


    }


    function WebGLInfo( gl ) {


        const memory = {

            geometries: 0,

            textures: 0

        };


        const render = {

            frame: 0,

            calls: 0,

            triangles: 0,

            points: 0,

            lines: 0

        };


        function update( count, mode, instanceCount ) {


            render.calls ++;


            switch ( mode ) {


                case gl.TRIANGLES:

                    render.triangles += instanceCount * ( count / 3 );

                    break;


                case gl.LINES:

                    render.lines += instanceCount * ( count / 2 );

                    break;


                case gl.LINE_STRIP:

                    render.lines += instanceCount * ( count - 1 );

                    break;


                case gl.LINE_LOOP:

                    render.lines += instanceCount * count;

                    break;


                case gl.POINTS:

                    render.points += instanceCount * count;

                    break;


                default:

                    console.error( 'THREE.WebGLInfo: Unknown draw mode:', mode );

                    break;


            }


        }


        function reset() {


            render.calls = 0;

            render.triangles = 0;

            render.points = 0;

            render.lines = 0;


        }


        return {

            memory: memory,

            render: render,

            programs: null,

            autoReset: true,

            reset: reset,

            update: update

        };


    }


    function numericalSort( a, b ) {


        return a[ 0 ] - b[ 0 ];


    }


    function absNumericalSort( a, b ) {


        return Math.abs( b[ 1 ] ) - Math.abs( a[ 1 ] );


    }


    function WebGLMorphtargets( gl, capabilities, textures ) {


        const influencesList = {};

        const morphInfluences = new Float32Array( 8 );

        const morphTextures = new WeakMap();

        const morph = new Vector4();


        const workInfluences = [];


        for ( let i = 0; i < 8; i ++ ) {


            workInfluences[ i ] = [ i, 0 ];


        }


        function update( object, geometry, program ) {


            const objectInfluences = object.morphTargetInfluences;


            if ( capabilities.isWebGL2 === true ) {


                // instead of using attributes, the WebGL 2 code path encodes morph targets

                // into an array of data textures. Each layer represents a single morph target.


                const morphAttribute = geometry.morphAttributes.position || geometry.morphAttributes.normal || geometry.morphAttributes.color;

                const morphTargetsCount = ( morphAttribute !== undefined ) ? morphAttribute.length : 0;


                let entry = morphTextures.get( geometry );


                if ( entry === undefined || entry.count !== morphTargetsCount ) {


                    if ( entry !== undefined ) entry.texture.dispose();


                    const hasMorphPosition = geometry.morphAttributes.position !== undefined;

                    const hasMorphNormals = geometry.morphAttributes.normal !== undefined;

                    const hasMorphColors = geometry.morphAttributes.color !== undefined;


                    const morphTargets = geometry.morphAttributes.position || [];

                    const morphNormals = geometry.morphAttributes.normal || [];

                    const morphColors = geometry.morphAttributes.color || [];


                    let vertexDataCount = 0;


                    if ( hasMorphPosition === true ) vertexDataCount = 1;

                    if ( hasMorphNormals === true ) vertexDataCount = 2;

                    if ( hasMorphColors === true ) vertexDataCount = 3;


                    let width = geometry.attributes.position.count * vertexDataCount;

                    let height = 1;


                    if ( width > capabilities.maxTextureSize ) {


                        height = Math.ceil( width / capabilities.maxTextureSize );

                        width = capabilities.maxTextureSize;


                    }


                    const buffer = new Float32Array( width * height * 4 * morphTargetsCount );


                    const texture = new DataArrayTexture( buffer, width, height, morphTargetsCount );

                    texture.type = FloatType;

                    texture.needsUpdate = true;


                    // fill buffer


                    const vertexDataStride = vertexDataCount * 4;


                    for ( let i = 0; i < morphTargetsCount; i ++ ) {


                        const morphTarget = morphTargets[ i ];

                        const morphNormal = morphNormals[ i ];

                        const morphColor = morphColors[ i ];


                        const offset = width * height * 4 * i;


                        for ( let j = 0; j < morphTarget.count; j ++ ) {


                            const stride = j * vertexDataStride;


                            if ( hasMorphPosition === true ) {


                                morph.fromBufferAttribute( morphTarget, j );


                                buffer[ offset + stride + 0 ] = morph.x;

                                buffer[ offset + stride + 1 ] = morph.y;

                                buffer[ offset + stride + 2 ] = morph.z;

                                buffer[ offset + stride + 3 ] = 0;


                            }


                            if ( hasMorphNormals === true ) {


                                morph.fromBufferAttribute( morphNormal, j );


                                buffer[ offset + stride + 4 ] = morph.x;

                                buffer[ offset + stride + 5 ] = morph.y;

                                buffer[ offset + stride + 6 ] = morph.z;

                                buffer[ offset + stride + 7 ] = 0;


                            }


                            if ( hasMorphColors === true ) {


                                morph.fromBufferAttribute( morphColor, j );


                                buffer[ offset + stride + 8 ] = morph.x;

                                buffer[ offset + stride + 9 ] = morph.y;

                                buffer[ offset + stride + 10 ] = morph.z;

                                buffer[ offset + stride + 11 ] = ( morphColor.itemSize === 4 ) ? morph.w : 1;


                            }


                        }


                    }


                    entry = {

                        count: morphTargetsCount,

                        texture: texture,

                        size: new Vector2( width, height )

                    };


                    morphTextures.set( geometry, entry );


                    function disposeTexture() {


                        texture.dispose();


                        morphTextures.delete( geometry );


                        geometry.removeEventListener( 'dispose', disposeTexture );


                    }


                    geometry.addEventListener( 'dispose', disposeTexture );


                }


                //


                let morphInfluencesSum = 0;


                for ( let i = 0; i < objectInfluences.length; i ++ ) {


                    morphInfluencesSum += objectInfluences[ i ];


                }


                const morphBaseInfluence = geometry.morphTargetsRelative ? 1 : 1 - morphInfluencesSum;


                program.getUniforms().setValue( gl, 'morphTargetBaseInfluence', morphBaseInfluence );

                program.getUniforms().setValue( gl, 'morphTargetInfluences', objectInfluences );


                program.getUniforms().setValue( gl, 'morphTargetsTexture', entry.texture, textures );

                program.getUniforms().setValue( gl, 'morphTargetsTextureSize', entry.size );


            } else {


                // When object doesn't have morph target influences defined, we treat it as a 0-length array

                // This is important to make sure we set up morphTargetBaseInfluence / morphTargetInfluences


                const length = objectInfluences === undefined ? 0 : objectInfluences.length;


                let influences = influencesList[ geometry.id ];


                if ( influences === undefined || influences.length !== length ) {


                    // initialise list


                    influences = [];


                    for ( let i = 0; i < length; i ++ ) {


                        influences[ i ] = [ i, 0 ];


                    }


                    influencesList[ geometry.id ] = influences;


                }


                // Collect influences


                for ( let i = 0; i < length; i ++ ) {


                    const influence = influences[ i ];


                    influence[ 0 ] = i;

                    influence[ 1 ] = objectInfluences[ i ];


                }


                influences.sort( absNumericalSort );


                for ( let i = 0; i < 8; i ++ ) {


                    if ( i < length && influences[ i ][ 1 ] ) {


                        workInfluences[ i ][ 0 ] = influences[ i ][ 0 ];

                        workInfluences[ i ][ 1 ] = influences[ i ][ 1 ];


                    } else {


                        workInfluences[ i ][ 0 ] = Number.MAX_SAFE_INTEGER;

                        workInfluences[ i ][ 1 ] = 0;


                    }


                }


                workInfluences.sort( numericalSort );


                const morphTargets = geometry.morphAttributes.position;

                const morphNormals = geometry.morphAttributes.normal;


                let morphInfluencesSum = 0;


                for ( let i = 0; i < 8; i ++ ) {


                    const influence = workInfluences[ i ];

                    const index = influence[ 0 ];

                    const value = influence[ 1 ];


                    if ( index !== Number.MAX_SAFE_INTEGER && value ) {


                        if ( morphTargets && geometry.getAttribute( 'morphTarget' + i ) !== morphTargets[ index ] ) {


                            geometry.setAttribute( 'morphTarget' + i, morphTargets[ index ] );


                        }


                        if ( morphNormals && geometry.getAttribute( 'morphNormal' + i ) !== morphNormals[ index ] ) {


                            geometry.setAttribute( 'morphNormal' + i, morphNormals[ index ] );


                        }


                        morphInfluences[ i ] = value;

                        morphInfluencesSum += value;


                    } else {


                        if ( morphTargets && geometry.hasAttribute( 'morphTarget' + i ) === true ) {


                            geometry.deleteAttribute( 'morphTarget' + i );


                        }


                        if ( morphNormals && geometry.hasAttribute( 'morphNormal' + i ) === true ) {


                            geometry.deleteAttribute( 'morphNormal' + i );


                        }


                        morphInfluences[ i ] = 0;


                    }


                }


                // GLSL shader uses formula baseinfluence * base + sum(target * influence)

                // This allows us to switch between absolute morphs and relative morphs without changing shader code

                // When baseinfluence = 1 - sum(influence), the above is equivalent to sum((target - base) * influence)

                const morphBaseInfluence = geometry.morphTargetsRelative ? 1 : 1 - morphInfluencesSum;


                program.getUniforms().setValue( gl, 'morphTargetBaseInfluence', morphBaseInfluence );

                program.getUniforms().setValue( gl, 'morphTargetInfluences', morphInfluences );


            }


        }


        return {


            update: update


        };


    }


    function WebGLObjects( gl, geometries, attributes, info ) {


        let updateMap = new WeakMap();


        function update( object ) {


            const frame = info.render.frame;


            const geometry = object.geometry;

            const buffergeometry = geometries.get( object, geometry );


            // Update once per frame


            if ( updateMap.get( buffergeometry ) !== frame ) {


                geometries.update( buffergeometry );


                updateMap.set( buffergeometry, frame );


            }


            if ( object.isInstancedMesh ) {


                if ( object.hasEventListener( 'dispose', onInstancedMeshDispose ) === false ) {


                    object.addEventListener( 'dispose', onInstancedMeshDispose );


                }


                if ( updateMap.get( object ) !== frame ) {


                    attributes.update( object.instanceMatrix, gl.ARRAY_BUFFER );


                    if ( object.instanceColor !== null ) {


                        attributes.update( object.instanceColor, gl.ARRAY_BUFFER );


                    }


                    updateMap.set( object, frame );


                }


            }


            if ( object.isSkinnedMesh ) {


                const skeleton = object.skeleton;


                if ( updateMap.get( skeleton ) !== frame ) {


                    skeleton.update();


                    updateMap.set( skeleton, frame );


                }


            }


            return buffergeometry;


        }


        function dispose() {


            updateMap = new WeakMap();


        }


        function onInstancedMeshDispose( event ) {


            const instancedMesh = event.target;


            instancedMesh.removeEventListener( 'dispose', onInstancedMeshDispose );


            attributes.remove( instancedMesh.instanceMatrix );


            if ( instancedMesh.instanceColor !== null ) attributes.remove( instancedMesh.instanceColor );


        }


        return {


            update: update,

            dispose: dispose


        };


    }


    class DepthTexture extends Texture {


        constructor( width, height, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, format ) {


            format = format !== undefined ? format : DepthFormat;


            if ( format !== DepthFormat && format !== DepthStencilFormat ) {


                throw new Error( 'DepthTexture format must be either THREE.DepthFormat or THREE.DepthStencilFormat' );


            }


            if ( type === undefined && format === DepthFormat ) type = UnsignedIntType;

            if ( type === undefined && format === DepthStencilFormat ) type = UnsignedInt248Type;


            super( null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );


            this.isDepthTexture = true;


            this.image = { width: width, height: height };


            this.magFilter = magFilter !== undefined ? magFilter : NearestFilter;

            this.minFilter = minFilter !== undefined ? minFilter : NearestFilter;


            this.flipY = false;

            this.generateMipmaps = false;


            this.compareFunction = null;


        }


        copy( source ) {


            super.copy( source );


            this.compareFunction = source.compareFunction;


            return this;


        }


        toJSON( meta ) {


            const data = super.toJSON( meta );


            if ( this.compareFunction !== null ) data.compareFunction = this.compareFunction;


            return data;


        }


    }


    const emptyTexture = /*@__PURE__*/ new Texture();


    const emptyShadowTexture = /*@__PURE__*/ new DepthTexture( 1, 1 );

    emptyShadowTexture.compareFunction = LessEqualCompare;


    const emptyArrayTexture = /*@__PURE__*/ new DataArrayTexture();

    const empty3dTexture = /*@__PURE__*/ new Data3DTexture();

    const emptyCubeTexture = /*@__PURE__*/ new CubeTexture();


    // --- Utilities ---


    // Array Caches (provide typed arrays for temporary by size)


    const arrayCacheF32 = [];

    const arrayCacheI32 = [];


    // Float32Array caches used for uploading Matrix uniforms


    const mat4array = new Float32Array( 16 );

    const mat3array = new Float32Array( 9 );

    const mat2array = new Float32Array( 4 );


    // Flattening for arrays of vectors and matrices


    function flatten( array, nBlocks, blockSize ) {


        const firstElem = array[ 0 ];


        if ( firstElem <= 0 || firstElem > 0 ) return array;

        // unoptimized: ! isNaN( firstElem )

        // see http://jacksondunstan.com/articles/983


        const n = nBlocks * blockSize;

        let r = arrayCacheF32[ n ];


        if ( r === undefined ) {


            r = new Float32Array( n );

            arrayCacheF32[ n ] = r;


        }


        if ( nBlocks !== 0 ) {


            firstElem.toArray( r, 0 );


            for ( let i = 1, offset = 0; i !== nBlocks; ++ i ) {


                offset += blockSize;

                array[ i ].toArray( r, offset );


            }


        }


        return r;


    }


    function arraysEqual( a, b ) {


        if ( a.length !== b.length ) return false;


        for ( let i = 0, l = a.length; i < l; i ++ ) {


            if ( a[ i ] !== b[ i ] ) return false;


        }


        return true;


    }


    function copyArray( a, b ) {


        for ( let i = 0, l = b.length; i < l; i ++ ) {


            a[ i ] = b[ i ];


        }


    }


    // Texture unit allocation


    function allocTexUnits( textures, n ) {


        let r = arrayCacheI32[ n ];


        if ( r === undefined ) {


            r = new Int32Array( n );

            arrayCacheI32[ n ] = r;


        }


        for ( let i = 0; i !== n; ++ i ) {


            r[ i ] = textures.allocateTextureUnit();


        }


        return r;


    }


    // --- Setters ---


    // Note: Defining these methods externally, because they come in a bunch

    // and this way their names minify.


    // Single scalar


    function setValueV1f( gl, v ) {


        const cache = this.cache;


        if ( cache[ 0 ] === v ) return;


        gl.uniform1f( this.addr, v );


        cache[ 0 ] = v;


    }


    // Single float vector (from flat array or THREE.VectorN)


    function setValueV2f( gl, v ) {


        const cache = this.cache;


        if ( v.x !== undefined ) {


            if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y ) {


                gl.uniform2f( this.addr, v.x, v.y );


                cache[ 0 ] = v.x;

                cache[ 1 ] = v.y;


            }


        } else {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniform2fv( this.addr, v );


            copyArray( cache, v );


        }


    }


    function setValueV3f( gl, v ) {


        const cache = this.cache;


        if ( v.x !== undefined ) {


            if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z ) {


                gl.uniform3f( this.addr, v.x, v.y, v.z );


                cache[ 0 ] = v.x;

                cache[ 1 ] = v.y;

                cache[ 2 ] = v.z;


            }


        } else if ( v.r !== undefined ) {


            if ( cache[ 0 ] !== v.r || cache[ 1 ] !== v.g || cache[ 2 ] !== v.b ) {


                gl.uniform3f( this.addr, v.r, v.g, v.b );


                cache[ 0 ] = v.r;

                cache[ 1 ] = v.g;

                cache[ 2 ] = v.b;


            }


        } else {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniform3fv( this.addr, v );


            copyArray( cache, v );


        }


    }


    function setValueV4f( gl, v ) {


        const cache = this.cache;


        if ( v.x !== undefined ) {


            if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z || cache[ 3 ] !== v.w ) {


                gl.uniform4f( this.addr, v.x, v.y, v.z, v.w );


                cache[ 0 ] = v.x;

                cache[ 1 ] = v.y;

                cache[ 2 ] = v.z;

                cache[ 3 ] = v.w;


            }


        } else {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniform4fv( this.addr, v );


            copyArray( cache, v );


        }


    }


    // Single matrix (from flat array or THREE.MatrixN)


    function setValueM2( gl, v ) {


        const cache = this.cache;

        const elements = v.elements;


        if ( elements === undefined ) {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniformMatrix2fv( this.addr, false, v );


            copyArray( cache, v );


        } else {


            if ( arraysEqual( cache, elements ) ) return;


            mat2array.set( elements );


            gl.uniformMatrix2fv( this.addr, false, mat2array );


            copyArray( cache, elements );


        }


    }


    function setValueM3( gl, v ) {


        const cache = this.cache;

        const elements = v.elements;


        if ( elements === undefined ) {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniformMatrix3fv( this.addr, false, v );


            copyArray( cache, v );


        } else {


            if ( arraysEqual( cache, elements ) ) return;


            mat3array.set( elements );


            gl.uniformMatrix3fv( this.addr, false, mat3array );


            copyArray( cache, elements );


        }


    }


    function setValueM4( gl, v ) {


        const cache = this.cache;

        const elements = v.elements;


        if ( elements === undefined ) {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniformMatrix4fv( this.addr, false, v );


            copyArray( cache, v );


        } else {


            if ( arraysEqual( cache, elements ) ) return;


            mat4array.set( elements );


            gl.uniformMatrix4fv( this.addr, false, mat4array );


            copyArray( cache, elements );


        }


    }


    // Single integer / boolean


    function setValueV1i( gl, v ) {


        const cache = this.cache;


        if ( cache[ 0 ] === v ) return;


        gl.uniform1i( this.addr, v );


        cache[ 0 ] = v;


    }


    // Single integer / boolean vector (from flat array or THREE.VectorN)


    function setValueV2i( gl, v ) {


        const cache = this.cache;


        if ( v.x !== undefined ) {


            if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y ) {


                gl.uniform2i( this.addr, v.x, v.y );


                cache[ 0 ] = v.x;

                cache[ 1 ] = v.y;


            }


        } else {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniform2iv( this.addr, v );


            copyArray( cache, v );


        }


    }


    function setValueV3i( gl, v ) {


        const cache = this.cache;


        if ( v.x !== undefined ) {


            if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z ) {


                gl.uniform3i( this.addr, v.x, v.y, v.z );


                cache[ 0 ] = v.x;

                cache[ 1 ] = v.y;

                cache[ 2 ] = v.z;


            }


        } else {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniform3iv( this.addr, v );


            copyArray( cache, v );


        }


    }


    function setValueV4i( gl, v ) {


        const cache = this.cache;


        if ( v.x !== undefined ) {


            if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z || cache[ 3 ] !== v.w ) {


                gl.uniform4i( this.addr, v.x, v.y, v.z, v.w );


                cache[ 0 ] = v.x;

                cache[ 1 ] = v.y;

                cache[ 2 ] = v.z;

                cache[ 3 ] = v.w;


            }


        } else {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniform4iv( this.addr, v );


            copyArray( cache, v );


        }


    }


    // Single unsigned integer


    function setValueV1ui( gl, v ) {


        const cache = this.cache;


        if ( cache[ 0 ] === v ) return;


        gl.uniform1ui( this.addr, v );


        cache[ 0 ] = v;


    }


    // Single unsigned integer vector (from flat array or THREE.VectorN)


    function setValueV2ui( gl, v ) {


        const cache = this.cache;


        if ( v.x !== undefined ) {


            if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y ) {


                gl.uniform2ui( this.addr, v.x, v.y );


                cache[ 0 ] = v.x;

                cache[ 1 ] = v.y;


            }


        } else {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniform2uiv( this.addr, v );


            copyArray( cache, v );


        }


    }


    function setValueV3ui( gl, v ) {


        const cache = this.cache;


        if ( v.x !== undefined ) {


            if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z ) {


                gl.uniform3ui( this.addr, v.x, v.y, v.z );


                cache[ 0 ] = v.x;

                cache[ 1 ] = v.y;

                cache[ 2 ] = v.z;


            }


        } else {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniform3uiv( this.addr, v );


            copyArray( cache, v );


        }


    }


    function setValueV4ui( gl, v ) {


        const cache = this.cache;


        if ( v.x !== undefined ) {


            if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z || cache[ 3 ] !== v.w ) {


                gl.uniform4ui( this.addr, v.x, v.y, v.z, v.w );


                cache[ 0 ] = v.x;

                cache[ 1 ] = v.y;

                cache[ 2 ] = v.z;

                cache[ 3 ] = v.w;


            }


        } else {


            if ( arraysEqual( cache, v ) ) return;


            gl.uniform4uiv( this.addr, v );


            copyArray( cache, v );


        }


    }


    // Single texture (2D / Cube)


    function setValueT1( gl, v, textures ) {


        const cache = this.cache;

        const unit = textures.allocateTextureUnit();


        if ( cache[ 0 ] !== unit ) {


            gl.uniform1i( this.addr, unit );

            cache[ 0 ] = unit;


        }


        const emptyTexture2D = ( this.type === gl.SAMPLER_2D_SHADOW ) ? emptyShadowTexture : emptyTexture;


        textures.setTexture2D( v || emptyTexture2D, unit );


    }


    function setValueT3D1( gl, v, textures ) {


        const cache = this.cache;

        const unit = textures.allocateTextureUnit();


        if ( cache[ 0 ] !== unit ) {


            gl.uniform1i( this.addr, unit );

            cache[ 0 ] = unit;


        }


        textures.setTexture3D( v || empty3dTexture, unit );


    }


    function setValueT6( gl, v, textures ) {


        const cache = this.cache;

        const unit = textures.allocateTextureUnit();


        if ( cache[ 0 ] !== unit ) {


            gl.uniform1i( this.addr, unit );

            cache[ 0 ] = unit;


        }


        textures.setTextureCube( v || emptyCubeTexture, unit );


    }


    function setValueT2DArray1( gl, v, textures ) {


        const cache = this.cache;

        const unit = textures.allocateTextureUnit();


        if ( cache[ 0 ] !== unit ) {


            gl.uniform1i( this.addr, unit );

            cache[ 0 ] = unit;


        }


        textures.setTexture2DArray( v || emptyArrayTexture, unit );


    }


    // Helper to pick the right setter for the singular case


    function getSingularSetter( type ) {


        switch ( type ) {


            case 0x1406: return setValueV1f; // FLOAT

            case 0x8b50: return setValueV2f; // _VEC2

            case 0x8b51: return setValueV3f; // _VEC3

            case 0x8b52: return setValueV4f; // _VEC4


            case 0x8b5a: return setValueM2; // _MAT2

            case 0x8b5b: return setValueM3; // _MAT3

            case 0x8b5c: return setValueM4; // _MAT4


            case 0x1404: case 0x8b56: return setValueV1i; // INT, BOOL

            case 0x8b53: case 0x8b57: return setValueV2i; // _VEC2

            case 0x8b54: case 0x8b58: return setValueV3i; // _VEC3

            case 0x8b55: case 0x8b59: return setValueV4i; // _VEC4


            case 0x1405: return setValueV1ui; // UINT

            case 0x8dc6: return setValueV2ui; // _VEC2

            case 0x8dc7: return setValueV3ui; // _VEC3

            case 0x8dc8: return setValueV4ui; // _VEC4


            case 0x8b5e: // SAMPLER_2D

            case 0x8d66: // SAMPLER_EXTERNAL_OES

            case 0x8dca: // INT_SAMPLER_2D

            case 0x8dd2: // UNSIGNED_INT_SAMPLER_2D

            case 0x8b62: // SAMPLER_2D_SHADOW

                return setValueT1;


            case 0x8b5f: // SAMPLER_3D

            case 0x8dcb: // INT_SAMPLER_3D

            case 0x8dd3: // UNSIGNED_INT_SAMPLER_3D

                return setValueT3D1;


            case 0x8b60: // SAMPLER_CUBE

            case 0x8dcc: // INT_SAMPLER_CUBE

            case 0x8dd4: // UNSIGNED_INT_SAMPLER_CUBE

            case 0x8dc5: // SAMPLER_CUBE_SHADOW

                return setValueT6;


            case 0x8dc1: // SAMPLER_2D_ARRAY

            case 0x8dcf: // INT_SAMPLER_2D_ARRAY

            case 0x8dd7: // UNSIGNED_INT_SAMPLER_2D_ARRAY

            case 0x8dc4: // SAMPLER_2D_ARRAY_SHADOW

                return setValueT2DArray1;


        }


    }


    // Array of scalars


    function setValueV1fArray( gl, v ) {


        gl.uniform1fv( this.addr, v );


    }


    // Array of vectors (from flat array or array of THREE.VectorN)


    function setValueV2fArray( gl, v ) {


        const data = flatten( v, this.size, 2 );


        gl.uniform2fv( this.addr, data );


    }


    function setValueV3fArray( gl, v ) {


        const data = flatten( v, this.size, 3 );


        gl.uniform3fv( this.addr, data );


    }


    function setValueV4fArray( gl, v ) {


        const data = flatten( v, this.size, 4 );


        gl.uniform4fv( this.addr, data );


    }


    // Array of matrices (from flat array or array of THREE.MatrixN)


    function setValueM2Array( gl, v ) {


        const data = flatten( v, this.size, 4 );


        gl.uniformMatrix2fv( this.addr, false, data );


    }


    function setValueM3Array( gl, v ) {


        const data = flatten( v, this.size, 9 );


        gl.uniformMatrix3fv( this.addr, false, data );


    }


    function setValueM4Array( gl, v ) {


        const data = flatten( v, this.size, 16 );


        gl.uniformMatrix4fv( this.addr, false, data );


    }


    // Array of integer / boolean


    function setValueV1iArray( gl, v ) {


        gl.uniform1iv( this.addr, v );


    }


    // Array of integer / boolean vectors (from flat array)


    function setValueV2iArray( gl, v ) {


        gl.uniform2iv( this.addr, v );


    }


    function setValueV3iArray( gl, v ) {


        gl.uniform3iv( this.addr, v );


    }


    function setValueV4iArray( gl, v ) {


        gl.uniform4iv( this.addr, v );


    }


    // Array of unsigned integer


    function setValueV1uiArray( gl, v ) {


        gl.uniform1uiv( this.addr, v );


    }


    // Array of unsigned integer vectors (from flat array)


    function setValueV2uiArray( gl, v ) {


        gl.uniform2uiv( this.addr, v );


    }


    function setValueV3uiArray( gl, v ) {


        gl.uniform3uiv( this.addr, v );


    }


    function setValueV4uiArray( gl, v ) {


        gl.uniform4uiv( this.addr, v );


    }


    // Array of textures (2D / 3D / Cube / 2DArray)


    function setValueT1Array( gl, v, textures ) {


        const cache = this.cache;


        const n = v.length;


        const units = allocTexUnits( textures, n );


        if ( ! arraysEqual( cache, units ) ) {


            gl.uniform1iv( this.addr, units );


            copyArray( cache, units );


        }


        for ( let i = 0; i !== n; ++ i ) {


            textures.setTexture2D( v[ i ] || emptyTexture, units[ i ] );


        }


    }


    function setValueT3DArray( gl, v, textures ) {


        const cache = this.cache;


        const n = v.length;


        const units = allocTexUnits( textures, n );


        if ( ! arraysEqual( cache, units ) ) {


            gl.uniform1iv( this.addr, units );


            copyArray( cache, units );


        }


        for ( let i = 0; i !== n; ++ i ) {


            textures.setTexture3D( v[ i ] || empty3dTexture, units[ i ] );


        }


    }


    function setValueT6Array( gl, v, textures ) {


        const cache = this.cache;


        const n = v.length;


        const units = allocTexUnits( textures, n );


        if ( ! arraysEqual( cache, units ) ) {


            gl.uniform1iv( this.addr, units );


            copyArray( cache, units );


        }


        for ( let i = 0; i !== n; ++ i ) {


            textures.setTextureCube( v[ i ] || emptyCubeTexture, units[ i ] );


        }


    }


    function setValueT2DArrayArray( gl, v, textures ) {


        const cache = this.cache;


        const n = v.length;


        const units = allocTexUnits( textures, n );


        if ( ! arraysEqual( cache, units ) ) {


            gl.uniform1iv( this.addr, units );


            copyArray( cache, units );


        }


        for ( let i = 0; i !== n; ++ i ) {


            textures.setTexture2DArray( v[ i ] || emptyArrayTexture, units[ i ] );


        }


    }


    // Helper to pick the right setter for a pure (bottom-level) array


    function getPureArraySetter( type ) {


        switch ( type ) {


            case 0x1406: return setValueV1fArray; // FLOAT

            case 0x8b50: return setValueV2fArray; // _VEC2

            case 0x8b51: return setValueV3fArray; // _VEC3

            case 0x8b52: return setValueV4fArray; // _VEC4


            case 0x8b5a: return setValueM2Array; // _MAT2

            case 0x8b5b: return setValueM3Array; // _MAT3

            case 0x8b5c: return setValueM4Array; // _MAT4


            case 0x1404: case 0x8b56: return setValueV1iArray; // INT, BOOL

            case 0x8b53: case 0x8b57: return setValueV2iArray; // _VEC2

            case 0x8b54: case 0x8b58: return setValueV3iArray; // _VEC3

            case 0x8b55: case 0x8b59: return setValueV4iArray; // _VEC4


            case 0x1405: return setValueV1uiArray; // UINT

            case 0x8dc6: return setValueV2uiArray; // _VEC2

            case 0x8dc7: return setValueV3uiArray; // _VEC3

            case 0x8dc8: return setValueV4uiArray; // _VEC4


            case 0x8b5e: // SAMPLER_2D

            case 0x8d66: // SAMPLER_EXTERNAL_OES

            case 0x8dca: // INT_SAMPLER_2D

            case 0x8dd2: // UNSIGNED_INT_SAMPLER_2D

            case 0x8b62: // SAMPLER_2D_SHADOW

                return setValueT1Array;


            case 0x8b5f: // SAMPLER_3D

            case 0x8dcb: // INT_SAMPLER_3D

            case 0x8dd3: // UNSIGNED_INT_SAMPLER_3D

                return setValueT3DArray;


            case 0x8b60: // SAMPLER_CUBE

            case 0x8dcc: // INT_SAMPLER_CUBE

            case 0x8dd4: // UNSIGNED_INT_SAMPLER_CUBE

            case 0x8dc5: // SAMPLER_CUBE_SHADOW

                return setValueT6Array;


            case 0x8dc1: // SAMPLER_2D_ARRAY

            case 0x8dcf: // INT_SAMPLER_2D_ARRAY

            case 0x8dd7: // UNSIGNED_INT_SAMPLER_2D_ARRAY

            case 0x8dc4: // SAMPLER_2D_ARRAY_SHADOW

                return setValueT2DArrayArray;


        }


    }


    // --- Uniform Classes ---


    class SingleUniform {


        constructor( id, activeInfo, addr ) {


            this.id = id;

            this.addr = addr;

            this.cache = [];

            this.type = activeInfo.type;

            this.setValue = getSingularSetter( activeInfo.type );


            // this.path = activeInfo.name; // DEBUG


        }


    }


    class PureArrayUniform {


        constructor( id, activeInfo, addr ) {


            this.id = id;

            this.addr = addr;

            this.cache = [];

            this.type = activeInfo.type;

            this.size = activeInfo.size;

            this.setValue = getPureArraySetter( activeInfo.type );


            // this.path = activeInfo.name; // DEBUG


        }


    }


    class StructuredUniform {


        constructor( id ) {


            this.id = id;


            this.seq = [];

            this.map = {};


        }


        setValue( gl, value, textures ) {


            const seq = this.seq;


            for ( let i = 0, n = seq.length; i !== n; ++ i ) {


                const u = seq[ i ];

                u.setValue( gl, value[ u.id ], textures );


            }


        }


    }


    // --- Top-level ---


    // Parser - builds up the property tree from the path strings


    const RePathPart = /(\w+)(\])?(\[|\.)?/g;


    // extracts

    //  - the identifier (member name or array index)

    //  - followed by an optional right bracket (found when array index)

    //  - followed by an optional left bracket or dot (type of subscript)

    //

    // Note: These portions can be read in a non-overlapping fashion and

    // allow straightforward parsing of the hierarchy that WebGL encodes

    // in the uniform names.


    function addUniform( container, uniformObject ) {


        container.seq.push( uniformObject );

        container.map[ uniformObject.id ] = uniformObject;


    }


    function parseUniform( activeInfo, addr, container ) {


        const path = activeInfo.name,

            pathLength = path.length;


        // reset RegExp object, because of the early exit of a previous run

        RePathPart.lastIndex = 0;


        while ( true ) {


            const match = RePathPart.exec( path ),

                matchEnd = RePathPart.lastIndex;


            let id = match[ 1 ];

            const idIsIndex = match[ 2 ] === ']',

                subscript = match[ 3 ];


            if ( idIsIndex ) id = id | 0; // convert to integer


            if ( subscript === undefined || subscript === '[' && matchEnd + 2 === pathLength ) {


                // bare name or "pure" bottom-level array "[0]" suffix


                addUniform( container, subscript === undefined ?

                    new SingleUniform( id, activeInfo, addr ) :

                    new PureArrayUniform( id, activeInfo, addr ) );


                break;


            } else {


                // step into inner node / create it in case it doesn't exist


                const map = container.map;

                let next = map[ id ];


                if ( next === undefined ) {


                    next = new StructuredUniform( id );

                    addUniform( container, next );


                }


                container = next;


            }


        }


    }


    // Root Container


    class WebGLUniforms {


        constructor( gl, program ) {


            this.seq = [];

            this.map = {};


            const n = gl.getProgramParameter( program, gl.ACTIVE_UNIFORMS );


            for ( let i = 0; i < n; ++ i ) {


                const info = gl.getActiveUniform( program, i ),

                    addr = gl.getUniformLocation( program, info.name );


                parseUniform( info, addr, this );


            }


        }


        setValue( gl, name, value, textures ) {


            const u = this.map[ name ];


            if ( u !== undefined ) u.setValue( gl, value, textures );


        }


        setOptional( gl, object, name ) {


            const v = object[ name ];


            if ( v !== undefined ) this.setValue( gl, name, v );


        }


        static upload( gl, seq, values, textures ) {


            for ( let i = 0, n = seq.length; i !== n; ++ i ) {


                const u = seq[ i ],

                    v = values[ u.id ];


                if ( v.needsUpdate !== false ) {


                    // note: always updating when .needsUpdate is undefined

                    u.setValue( gl, v.value, textures );


                }


            }


        }


        static seqWithValue( seq, values ) {


            const r = [];


            for ( let i = 0, n = seq.length; i !== n; ++ i ) {


                const u = seq[ i ];

                if ( u.id in values ) r.push( u );


            }


            return r;


        }


    }


    function WebGLShader( gl, type, string ) {


        const shader = gl.createShader( type );


        gl.shaderSource( shader, string );

        gl.compileShader( shader );


        return shader;


    }


    // From https://www.khronos.org/registry/webgl/extensions/KHR_parallel_shader_compile/

    const COMPLETION_STATUS_KHR = 0x91B1;


    let programIdCount = 0;


    function handleSource( string, errorLine ) {


        const lines = string.split( '\n' );

        const lines2 = [];


        const from = Math.max( errorLine - 6, 0 );

        const to = Math.min( errorLine + 6, lines.length );


        for ( let i = from; i < to; i ++ ) {


            const line = i + 1;

            lines2.push( `${line === errorLine ? '>' : ' '} ${line}: ${lines[ i ]}` );


        }


        return lines2.join( '\n' );


    }


    function getEncodingComponents( colorSpace ) {


        const workingPrimaries = ColorManagement.getPrimaries( ColorManagement.workingColorSpace );

        const encodingPrimaries = ColorManagement.getPrimaries( colorSpace );


        let gamutMapping;


        if ( workingPrimaries === encodingPrimaries ) {


            gamutMapping = '';


        } else if ( workingPrimaries === P3Primaries && encodingPrimaries === Rec709Primaries ) {


            gamutMapping = 'LinearDisplayP3ToLinearSRGB';


        } else if ( workingPrimaries === Rec709Primaries && encodingPrimaries === P3Primaries ) {


            gamutMapping = 'LinearSRGBToLinearDisplayP3';


        }


        switch ( colorSpace ) {


            case LinearSRGBColorSpace:

            case LinearDisplayP3ColorSpace:

                return [ gamutMapping, 'LinearTransferOETF' ];


            case SRGBColorSpace:

            case DisplayP3ColorSpace:

                return [ gamutMapping, 'sRGBTransferOETF' ];


            default:

                console.warn( 'THREE.WebGLProgram: Unsupported color space:', colorSpace );

                return [ gamutMapping, 'LinearTransferOETF' ];


        }


    }


    function getShaderErrors( gl, shader, type ) {


        const status = gl.getShaderParameter( shader, gl.COMPILE_STATUS );

        const errors = gl.getShaderInfoLog( shader ).trim();


        if ( status && errors === '' ) return '';


        const errorMatches = /ERROR: 0:(\d+)/.exec( errors );

        if ( errorMatches ) {


            // --enable-privileged-webgl-extension

            // console.log( '**' + type + '**', gl.getExtension( 'WEBGL_debug_shaders' ).getTranslatedShaderSource( shader ) );


            const errorLine = parseInt( errorMatches[ 1 ] );

            return type.toUpperCase() + '\n\n' + errors + '\n\n' + handleSource( gl.getShaderSource( shader ), errorLine );


        } else {


            return errors;


        }


    }


    function getTexelEncodingFunction( functionName, colorSpace ) {


        const components = getEncodingComponents( colorSpace );

        return `vec4 ${functionName}( vec4 value ) { return ${components[ 0 ]}( ${components[ 1 ]}( value ) ); }`;


    }


    function getToneMappingFunction( functionName, toneMapping ) {


        let toneMappingName;


        switch ( toneMapping ) {


            case LinearToneMapping:

                toneMappingName = 'Linear';

                break;


            case ReinhardToneMapping:

                toneMappingName = 'Reinhard';

                break;


            case CineonToneMapping:

                toneMappingName = 'OptimizedCineon';

                break;


            case ACESFilmicToneMapping:

                toneMappingName = 'ACESFilmic';

                break;


            case AgXToneMapping:

                toneMappingName = 'AgX';

                break;


            case CustomToneMapping:

                toneMappingName = 'Custom';

                break;


            default:

                console.warn( 'THREE.WebGLProgram: Unsupported toneMapping:', toneMapping );

                toneMappingName = 'Linear';


        }


        return 'vec3 ' + functionName + '( vec3 color ) { return ' + toneMappingName + 'ToneMapping( color ); }';


    }


    function generateExtensions( parameters ) {


        const chunks = [

            ( parameters.extensionDerivatives || !! parameters.envMapCubeUVHeight || parameters.bumpMap || parameters.normalMapTangentSpace || parameters.clearcoatNormalMap || parameters.flatShading || parameters.shaderID === 'physical' ) ? '#extension GL_OES_standard_derivatives : enable' : '',

            ( parameters.extensionFragDepth || parameters.logarithmicDepthBuffer ) && parameters.rendererExtensionFragDepth ? '#extension GL_EXT_frag_depth : enable' : '',

            ( parameters.extensionDrawBuffers && parameters.rendererExtensionDrawBuffers ) ? '#extension GL_EXT_draw_buffers : require' : '',

            ( parameters.extensionShaderTextureLOD || parameters.envMap || parameters.transmission ) && parameters.rendererExtensionShaderTextureLod ? '#extension GL_EXT_shader_texture_lod : enable' : ''

        ];


        return chunks.filter( filterEmptyLine ).join( '\n' );


    }


    function generateVertexExtensions( parameters ) {


        const chunks = [

            parameters.extensionClipCullDistance ? '#extension GL_ANGLE_clip_cull_distance : require' : ''

        ];


        return chunks.filter( filterEmptyLine ).join( '\n' );


    }


    function generateDefines( defines ) {


        const chunks = [];


        for ( const name in defines ) {


            const value = defines[ name ];


            if ( value === false ) continue;


            chunks.push( '#define ' + name + ' ' + value );


        }


        return chunks.join( '\n' );


    }


    function fetchAttributeLocations( gl, program ) {


        const attributes = {};


        const n = gl.getProgramParameter( program, gl.ACTIVE_ATTRIBUTES );


        for ( let i = 0; i < n; i ++ ) {


            const info = gl.getActiveAttrib( program, i );

            const name = info.name;


            let locationSize = 1;

            if ( info.type === gl.FLOAT_MAT2 ) locationSize = 2;

            if ( info.type === gl.FLOAT_MAT3 ) locationSize = 3;

            if ( info.type === gl.FLOAT_MAT4 ) locationSize = 4;


            // console.log( 'THREE.WebGLProgram: ACTIVE VERTEX ATTRIBUTE:', name, i );


            attributes[ name ] = {

                type: info.type,

                location: gl.getAttribLocation( program, name ),

                locationSize: locationSize

            };


        }


        return attributes;


    }


    function filterEmptyLine( string ) {


        return string !== '';


    }


    function replaceLightNums( string, parameters ) {


        const numSpotLightCoords = parameters.numSpotLightShadows + parameters.numSpotLightMaps - parameters.numSpotLightShadowsWithMaps;


        return string

            .replace( /NUM_DIR_LIGHTS/g, parameters.numDirLights )

            .replace( /NUM_SPOT_LIGHTS/g, parameters.numSpotLights )

            .replace( /NUM_SPOT_LIGHT_MAPS/g, parameters.numSpotLightMaps )

            .replace( /NUM_SPOT_LIGHT_COORDS/g, numSpotLightCoords )

            .replace( /NUM_RECT_AREA_LIGHTS/g, parameters.numRectAreaLights )

            .replace( /NUM_POINT_LIGHTS/g, parameters.numPointLights )

            .replace( /NUM_HEMI_LIGHTS/g, parameters.numHemiLights )

            .replace( /NUM_DIR_LIGHT_SHADOWS/g, parameters.numDirLightShadows )

            .replace( /NUM_SPOT_LIGHT_SHADOWS_WITH_MAPS/g, parameters.numSpotLightShadowsWithMaps )

            .replace( /NUM_SPOT_LIGHT_SHADOWS/g, parameters.numSpotLightShadows )

            .replace( /NUM_POINT_LIGHT_SHADOWS/g, parameters.numPointLightShadows );


    }


    function replaceClippingPlaneNums( string, parameters ) {


        return string

            .replace( /NUM_CLIPPING_PLANES/g, parameters.numClippingPlanes )

            .replace( /UNION_CLIPPING_PLANES/g, ( parameters.numClippingPlanes - parameters.numClipIntersection ) );


    }


    // Resolve Includes


    const includePattern = /^[ \t]*#include +<([\w\d./]+)>/gm;


    function resolveIncludes( string ) {


        return string.replace( includePattern, includeReplacer );


    }


    const shaderChunkMap = new Map( [

        [ 'encodings_fragment', 'colorspace_fragment' ], // @deprecated, r154

        [ 'encodings_pars_fragment', 'colorspace_pars_fragment' ], // @deprecated, r154

        [ 'output_fragment', 'opaque_fragment' ], // @deprecated, r154

    ] );


    function includeReplacer( match, include ) {


        let string = ShaderChunk[ include ];


        if ( string === undefined ) {


            const newInclude = shaderChunkMap.get( include );


            if ( newInclude !== undefined ) {


                string = ShaderChunk[ newInclude ];

                console.warn( 'THREE.WebGLRenderer: Shader chunk "%s" has been deprecated. Use "%s" instead.', include, newInclude );


            } else {


                throw new Error( 'Can not resolve #include <' + include + '>' );


            }


        }


        return resolveIncludes( string );


    }


    // Unroll Loops


    const unrollLoopPattern = /#pragma unroll_loop_start\s+for\s*\‍(\s*int\s+i\s*=\s*(\d+)\s*;\s*i\s*<\s*(\d+)\s*;\s*i\s*\+\+\s*\‍)\s*{([\s\S]+?)}\s+#pragma unroll_loop_end/g;


    function unrollLoops( string ) {


        return string.replace( unrollLoopPattern, loopReplacer );


    }


    function loopReplacer( match, start, end, snippet ) {


        let string = '';


        for ( let i = parseInt( start ); i < parseInt( end ); i ++ ) {


            string += snippet

                .replace( /\[\s*i\s*\]/g, '[ ' + i + ' ]' )

                .replace( /UNROLLED_LOOP_INDEX/g, i );


        }


        return string;


    }


    //


    function generatePrecision( parameters ) {


        let precisionstring = 'precision ' + parameters.precision + ' float;\nprecision ' + parameters.precision + ' int;';


        if ( parameters.precision === 'highp' ) {


            precisionstring += '\n#define HIGH_PRECISION';


        } else if ( parameters.precision === 'mediump' ) {


            precisionstring += '\n#define MEDIUM_PRECISION';


        } else if ( parameters.precision === 'lowp' ) {


            precisionstring += '\n#define LOW_PRECISION';


        }


        return precisionstring;


    }


    function generateShadowMapTypeDefine( parameters ) {


        let shadowMapTypeDefine = 'SHADOWMAP_TYPE_BASIC';


        if ( parameters.shadowMapType === PCFShadowMap ) {


            shadowMapTypeDefine = 'SHADOWMAP_TYPE_PCF';


        } else if ( parameters.shadowMapType === PCFSoftShadowMap ) {


            shadowMapTypeDefine = 'SHADOWMAP_TYPE_PCF_SOFT';


        } else if ( parameters.shadowMapType === VSMShadowMap ) {


            shadowMapTypeDefine = 'SHADOWMAP_TYPE_VSM';


        }


        return shadowMapTypeDefine;


    }


    function generateEnvMapTypeDefine( parameters ) {


        let envMapTypeDefine = 'ENVMAP_TYPE_CUBE';


        if ( parameters.envMap ) {


            switch ( parameters.envMapMode ) {


                case CubeReflectionMapping:

                case CubeRefractionMapping:

                    envMapTypeDefine = 'ENVMAP_TYPE_CUBE';

                    break;


                case CubeUVReflectionMapping:

                    envMapTypeDefine = 'ENVMAP_TYPE_CUBE_UV';

                    break;


            }


        }


        return envMapTypeDefine;


    }


    function generateEnvMapModeDefine( parameters ) {


        let envMapModeDefine = 'ENVMAP_MODE_REFLECTION';


        if ( parameters.envMap ) {


            switch ( parameters.envMapMode ) {


                case CubeRefractionMapping:


                    envMapModeDefine = 'ENVMAP_MODE_REFRACTION';

                    break;


            }


        }


        return envMapModeDefine;


    }


    function generateEnvMapBlendingDefine( parameters ) {


        let envMapBlendingDefine = 'ENVMAP_BLENDING_NONE';


        if ( parameters.envMap ) {


            switch ( parameters.combine ) {


                case MultiplyOperation:

                    envMapBlendingDefine = 'ENVMAP_BLENDING_MULTIPLY';

                    break;


                case MixOperation:

                    envMapBlendingDefine = 'ENVMAP_BLENDING_MIX';

                    break;


                case AddOperation:

                    envMapBlendingDefine = 'ENVMAP_BLENDING_ADD';

                    break;


            }


        }


        return envMapBlendingDefine;


    }


    function generateCubeUVSize( parameters ) {


        const imageHeight = parameters.envMapCubeUVHeight;


        if ( imageHeight === null ) return null;


        const maxMip = Math.log2( imageHeight ) - 2;


        const texelHeight = 1.0 / imageHeight;


        const texelWidth = 1.0 / ( 3 * Math.max( Math.pow( 2, maxMip ), 7 * 16 ) );


        return { texelWidth, texelHeight, maxMip };


    }


    function WebGLProgram( renderer, cacheKey, parameters, bindingStates ) {


        // TODO Send this event to Three.js DevTools

        // console.log( 'WebGLProgram', cacheKey );


        const gl = renderer.getContext();


        const defines = parameters.defines;


        let vertexShader = parameters.vertexShader;

        let fragmentShader = parameters.fragmentShader;


        const shadowMapTypeDefine = generateShadowMapTypeDefine( parameters );

        const envMapTypeDefine = generateEnvMapTypeDefine( parameters );

        const envMapModeDefine = generateEnvMapModeDefine( parameters );

        const envMapBlendingDefine = generateEnvMapBlendingDefine( parameters );

        const envMapCubeUVSize = generateCubeUVSize( parameters );


        const customExtensions = parameters.isWebGL2 ? '' : generateExtensions( parameters );


        const customVertexExtensions = generateVertexExtensions( parameters );


        const customDefines = generateDefines( defines );


        const program = gl.createProgram();


        let prefixVertex, prefixFragment;

        let versionString = parameters.glslVersion ? '#version ' + parameters.glslVersion + '\n' : '';


        if ( parameters.isRawShaderMaterial ) {


            prefixVertex = [


                '#define SHADER_TYPE ' + parameters.shaderType,

                '#define SHADER_NAME ' + parameters.shaderName,


                customDefines


            ].filter( filterEmptyLine ).join( '\n' );


            if ( prefixVertex.length > 0 ) {


                prefixVertex += '\n';


            }


            prefixFragment = [


                customExtensions,


                '#define SHADER_TYPE ' + parameters.shaderType,

                '#define SHADER_NAME ' + parameters.shaderName,


                customDefines


            ].filter( filterEmptyLine ).join( '\n' );


            if ( prefixFragment.length > 0 ) {


                prefixFragment += '\n';


            }


        } else {


            prefixVertex = [


                generatePrecision( parameters ),


                '#define SHADER_TYPE ' + parameters.shaderType,

                '#define SHADER_NAME ' + parameters.shaderName,


                customDefines,


                parameters.extensionClipCullDistance ? '#define USE_CLIP_DISTANCE' : '',

                parameters.batching ? '#define USE_BATCHING' : '',

                parameters.instancing ? '#define USE_INSTANCING' : '',

                parameters.instancingColor ? '#define USE_INSTANCING_COLOR' : '',


                parameters.useFog && parameters.fog ? '#define USE_FOG' : '',

                parameters.useFog && parameters.fogExp2 ? '#define FOG_EXP2' : '',


                parameters.map ? '#define USE_MAP' : '',

                parameters.envMap ? '#define USE_ENVMAP' : '',

                parameters.envMap ? '#define ' + envMapModeDefine : '',

                parameters.lightMap ? '#define USE_LIGHTMAP' : '',

                parameters.aoMap ? '#define USE_AOMAP' : '',

                parameters.bumpMap ? '#define USE_BUMPMAP' : '',

                parameters.normalMap ? '#define USE_NORMALMAP' : '',

                parameters.normalMapObjectSpace ? '#define USE_NORMALMAP_OBJECTSPACE' : '',

                parameters.normalMapTangentSpace ? '#define USE_NORMALMAP_TANGENTSPACE' : '',

                parameters.displacementMap ? '#define USE_DISPLACEMENTMAP' : '',

                parameters.emissiveMap ? '#define USE_EMISSIVEMAP' : '',


                parameters.anisotropy ? '#define USE_ANISOTROPY' : '',

                parameters.anisotropyMap ? '#define USE_ANISOTROPYMAP' : '',


                parameters.clearcoatMap ? '#define USE_CLEARCOATMAP' : '',

                parameters.clearcoatRoughnessMap ? '#define USE_CLEARCOAT_ROUGHNESSMAP' : '',

                parameters.clearcoatNormalMap ? '#define USE_CLEARCOAT_NORMALMAP' : '',


                parameters.iridescenceMap ? '#define USE_IRIDESCENCEMAP' : '',

                parameters.iridescenceThicknessMap ? '#define USE_IRIDESCENCE_THICKNESSMAP' : '',


                parameters.specularMap ? '#define USE_SPECULARMAP' : '',

                parameters.specularColorMap ? '#define USE_SPECULAR_COLORMAP' : '',

                parameters.specularIntensityMap ? '#define USE_SPECULAR_INTENSITYMAP' : '',


                parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',

                parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',

                parameters.alphaMap ? '#define USE_ALPHAMAP' : '',

                parameters.alphaHash ? '#define USE_ALPHAHASH' : '',


                parameters.transmission ? '#define USE_TRANSMISSION' : '',

                parameters.transmissionMap ? '#define USE_TRANSMISSIONMAP' : '',

                parameters.thicknessMap ? '#define USE_THICKNESSMAP' : '',


                parameters.sheenColorMap ? '#define USE_SHEEN_COLORMAP' : '',

                parameters.sheenRoughnessMap ? '#define USE_SHEEN_ROUGHNESSMAP' : '',


                //


                parameters.mapUv ? '#define MAP_UV ' + parameters.mapUv : '',

                parameters.alphaMapUv ? '#define ALPHAMAP_UV ' + parameters.alphaMapUv : '',

                parameters.lightMapUv ? '#define LIGHTMAP_UV ' + parameters.lightMapUv : '',

                parameters.aoMapUv ? '#define AOMAP_UV ' + parameters.aoMapUv : '',

                parameters.emissiveMapUv ? '#define EMISSIVEMAP_UV ' + parameters.emissiveMapUv : '',

                parameters.bumpMapUv ? '#define BUMPMAP_UV ' + parameters.bumpMapUv : '',

                parameters.normalMapUv ? '#define NORMALMAP_UV ' + parameters.normalMapUv : '',

                parameters.displacementMapUv ? '#define DISPLACEMENTMAP_UV ' + parameters.displacementMapUv : '',


                parameters.metalnessMapUv ? '#define METALNESSMAP_UV ' + parameters.metalnessMapUv : '',

                parameters.roughnessMapUv ? '#define ROUGHNESSMAP_UV ' + parameters.roughnessMapUv : '',


                parameters.anisotropyMapUv ? '#define ANISOTROPYMAP_UV ' + parameters.anisotropyMapUv : '',


                parameters.clearcoatMapUv ? '#define CLEARCOATMAP_UV ' + parameters.clearcoatMapUv : '',

                parameters.clearcoatNormalMapUv ? '#define CLEARCOAT_NORMALMAP_UV ' + parameters.clearcoatNormalMapUv : '',

                parameters.clearcoatRoughnessMapUv ? '#define CLEARCOAT_ROUGHNESSMAP_UV ' + parameters.clearcoatRoughnessMapUv : '',


                parameters.iridescenceMapUv ? '#define IRIDESCENCEMAP_UV ' + parameters.iridescenceMapUv : '',

                parameters.iridescenceThicknessMapUv ? '#define IRIDESCENCE_THICKNESSMAP_UV ' + parameters.iridescenceThicknessMapUv : '',


                parameters.sheenColorMapUv ? '#define SHEEN_COLORMAP_UV ' + parameters.sheenColorMapUv : '',

                parameters.sheenRoughnessMapUv ? '#define SHEEN_ROUGHNESSMAP_UV ' + parameters.sheenRoughnessMapUv : '',


                parameters.specularMapUv ? '#define SPECULARMAP_UV ' + parameters.specularMapUv : '',

                parameters.specularColorMapUv ? '#define SPECULAR_COLORMAP_UV ' + parameters.specularColorMapUv : '',

                parameters.specularIntensityMapUv ? '#define SPECULAR_INTENSITYMAP_UV ' + parameters.specularIntensityMapUv : '',


                parameters.transmissionMapUv ? '#define TRANSMISSIONMAP_UV ' + parameters.transmissionMapUv : '',

                parameters.thicknessMapUv ? '#define THICKNESSMAP_UV ' + parameters.thicknessMapUv : '',


                //


                parameters.vertexTangents && parameters.flatShading === false ? '#define USE_TANGENT' : '',

                parameters.vertexColors ? '#define USE_COLOR' : '',

                parameters.vertexAlphas ? '#define USE_COLOR_ALPHA' : '',

                parameters.vertexUv1s ? '#define USE_UV1' : '',

                parameters.vertexUv2s ? '#define USE_UV2' : '',

                parameters.vertexUv3s ? '#define USE_UV3' : '',


                parameters.pointsUvs ? '#define USE_POINTS_UV' : '',


                parameters.flatShading ? '#define FLAT_SHADED' : '',


                parameters.skinning ? '#define USE_SKINNING' : '',


                parameters.morphTargets ? '#define USE_MORPHTARGETS' : '',

                parameters.morphNormals && parameters.flatShading === false ? '#define USE_MORPHNORMALS' : '',

                ( parameters.morphColors && parameters.isWebGL2 ) ? '#define USE_MORPHCOLORS' : '',

                ( parameters.morphTargetsCount > 0 && parameters.isWebGL2 ) ? '#define MORPHTARGETS_TEXTURE' : '',

                ( parameters.morphTargetsCount > 0 && parameters.isWebGL2 ) ? '#define MORPHTARGETS_TEXTURE_STRIDE ' + parameters.morphTextureStride : '',

                ( parameters.morphTargetsCount > 0 && parameters.isWebGL2 ) ? '#define MORPHTARGETS_COUNT ' + parameters.morphTargetsCount : '',

                parameters.doubleSided ? '#define DOUBLE_SIDED' : '',

                parameters.flipSided ? '#define FLIP_SIDED' : '',


                parameters.shadowMapEnabled ? '#define USE_SHADOWMAP' : '',

                parameters.shadowMapEnabled ? '#define ' + shadowMapTypeDefine : '',


                parameters.sizeAttenuation ? '#define USE_SIZEATTENUATION' : '',


                parameters.numLightProbes > 0 ? '#define USE_LIGHT_PROBES' : '',


                parameters.useLegacyLights ? '#define LEGACY_LIGHTS' : '',


                parameters.logarithmicDepthBuffer ? '#define USE_LOGDEPTHBUF' : '',

                ( parameters.logarithmicDepthBuffer && parameters.rendererExtensionFragDepth ) ? '#define USE_LOGDEPTHBUF_EXT' : '',


                'uniform mat4 modelMatrix;',

                'uniform mat4 modelViewMatrix;',

                'uniform mat4 projectionMatrix;',

                'uniform mat4 viewMatrix;',

                'uniform mat3 normalMatrix;',

                'uniform vec3 cameraPosition;',

                'uniform bool isOrthographic;',


                '#ifdef USE_INSTANCING',


                '   attribute mat4 instanceMatrix;',


                '#endif',


                '#ifdef USE_INSTANCING_COLOR',


                '   attribute vec3 instanceColor;',


                '#endif',


                'attribute vec3 position;',

                'attribute vec3 normal;',

                'attribute vec2 uv;',


                '#ifdef USE_UV1',


                '   attribute vec2 uv1;',


                '#endif',


                '#ifdef USE_UV2',


                '   attribute vec2 uv2;',


                '#endif',


                '#ifdef USE_UV3',


                '   attribute vec2 uv3;',


                '#endif',


                '#ifdef USE_TANGENT',


                '   attribute vec4 tangent;',


                '#endif',


                '#if defined( USE_COLOR_ALPHA )',


                '   attribute vec4 color;',


                '#elif defined( USE_COLOR )',


                '   attribute vec3 color;',


                '#endif',


                '#if ( defined( USE_MORPHTARGETS ) && ! defined( MORPHTARGETS_TEXTURE ) )',


                '   attribute vec3 morphTarget0;',

                '   attribute vec3 morphTarget1;',

                '   attribute vec3 morphTarget2;',

                '   attribute vec3 morphTarget3;',


                '   #ifdef USE_MORPHNORMALS',


                '       attribute vec3 morphNormal0;',

                '       attribute vec3 morphNormal1;',

                '       attribute vec3 morphNormal2;',

                '       attribute vec3 morphNormal3;',


                '   #else',


                '       attribute vec3 morphTarget4;',

                '       attribute vec3 morphTarget5;',

                '       attribute vec3 morphTarget6;',

                '       attribute vec3 morphTarget7;',


                '   #endif',


                '#endif',


                '#ifdef USE_SKINNING',


                '   attribute vec4 skinIndex;',

                '   attribute vec4 skinWeight;',


                '#endif',


                '\n'


            ].filter( filterEmptyLine ).join( '\n' );


            prefixFragment = [


                customExtensions,


                generatePrecision( parameters ),


                '#define SHADER_TYPE ' + parameters.shaderType,

                '#define SHADER_NAME ' + parameters.shaderName,


                customDefines,


                parameters.useFog && parameters.fog ? '#define USE_FOG' : '',

                parameters.useFog && parameters.fogExp2 ? '#define FOG_EXP2' : '',


                parameters.map ? '#define USE_MAP' : '',

                parameters.matcap ? '#define USE_MATCAP' : '',

                parameters.envMap ? '#define USE_ENVMAP' : '',

                parameters.envMap ? '#define ' + envMapTypeDefine : '',

                parameters.envMap ? '#define ' + envMapModeDefine : '',

                parameters.envMap ? '#define ' + envMapBlendingDefine : '',

                envMapCubeUVSize ? '#define CUBEUV_TEXEL_WIDTH ' + envMapCubeUVSize.texelWidth : '',

                envMapCubeUVSize ? '#define CUBEUV_TEXEL_HEIGHT ' + envMapCubeUVSize.texelHeight : '',

                envMapCubeUVSize ? '#define CUBEUV_MAX_MIP ' + envMapCubeUVSize.maxMip + '.0' : '',

                parameters.lightMap ? '#define USE_LIGHTMAP' : '',

                parameters.aoMap ? '#define USE_AOMAP' : '',

                parameters.bumpMap ? '#define USE_BUMPMAP' : '',

                parameters.normalMap ? '#define USE_NORMALMAP' : '',

                parameters.normalMapObjectSpace ? '#define USE_NORMALMAP_OBJECTSPACE' : '',

                parameters.normalMapTangentSpace ? '#define USE_NORMALMAP_TANGENTSPACE' : '',

                parameters.emissiveMap ? '#define USE_EMISSIVEMAP' : '',


                parameters.anisotropy ? '#define USE_ANISOTROPY' : '',

                parameters.anisotropyMap ? '#define USE_ANISOTROPYMAP' : '',


                parameters.clearcoat ? '#define USE_CLEARCOAT' : '',

                parameters.clearcoatMap ? '#define USE_CLEARCOATMAP' : '',

                parameters.clearcoatRoughnessMap ? '#define USE_CLEARCOAT_ROUGHNESSMAP' : '',

                parameters.clearcoatNormalMap ? '#define USE_CLEARCOAT_NORMALMAP' : '',


                parameters.iridescence ? '#define USE_IRIDESCENCE' : '',

                parameters.iridescenceMap ? '#define USE_IRIDESCENCEMAP' : '',

                parameters.iridescenceThicknessMap ? '#define USE_IRIDESCENCE_THICKNESSMAP' : '',


                parameters.specularMap ? '#define USE_SPECULARMAP' : '',

                parameters.specularColorMap ? '#define USE_SPECULAR_COLORMAP' : '',

                parameters.specularIntensityMap ? '#define USE_SPECULAR_INTENSITYMAP' : '',


                parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',

                parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',


                parameters.alphaMap ? '#define USE_ALPHAMAP' : '',

                parameters.alphaTest ? '#define USE_ALPHATEST' : '',

                parameters.alphaHash ? '#define USE_ALPHAHASH' : '',


                parameters.sheen ? '#define USE_SHEEN' : '',

                parameters.sheenColorMap ? '#define USE_SHEEN_COLORMAP' : '',

                parameters.sheenRoughnessMap ? '#define USE_SHEEN_ROUGHNESSMAP' : '',


                parameters.transmission ? '#define USE_TRANSMISSION' : '',

                parameters.transmissionMap ? '#define USE_TRANSMISSIONMAP' : '',

                parameters.thicknessMap ? '#define USE_THICKNESSMAP' : '',


                parameters.vertexTangents && parameters.flatShading === false ? '#define USE_TANGENT' : '',

                parameters.vertexColors || parameters.instancingColor ? '#define USE_COLOR' : '',

                parameters.vertexAlphas ? '#define USE_COLOR_ALPHA' : '',

                parameters.vertexUv1s ? '#define USE_UV1' : '',

                parameters.vertexUv2s ? '#define USE_UV2' : '',

                parameters.vertexUv3s ? '#define USE_UV3' : '',


                parameters.pointsUvs ? '#define USE_POINTS_UV' : '',


                parameters.gradientMap ? '#define USE_GRADIENTMAP' : '',


                parameters.flatShading ? '#define FLAT_SHADED' : '',


                parameters.doubleSided ? '#define DOUBLE_SIDED' : '',

                parameters.flipSided ? '#define FLIP_SIDED' : '',


                parameters.shadowMapEnabled ? '#define USE_SHADOWMAP' : '',

                parameters.shadowMapEnabled ? '#define ' + shadowMapTypeDefine : '',


                parameters.premultipliedAlpha ? '#define PREMULTIPLIED_ALPHA' : '',


                parameters.numLightProbes > 0 ? '#define USE_LIGHT_PROBES' : '',


                parameters.useLegacyLights ? '#define LEGACY_LIGHTS' : '',


                parameters.decodeVideoTexture ? '#define DECODE_VIDEO_TEXTURE' : '',


                parameters.logarithmicDepthBuffer ? '#define USE_LOGDEPTHBUF' : '',

                ( parameters.logarithmicDepthBuffer && parameters.rendererExtensionFragDepth ) ? '#define USE_LOGDEPTHBUF_EXT' : '',


                'uniform mat4 viewMatrix;',

                'uniform vec3 cameraPosition;',

                'uniform bool isOrthographic;',


                ( parameters.toneMapping !== NoToneMapping ) ? '#define TONE_MAPPING' : '',

                ( parameters.toneMapping !== NoToneMapping ) ? ShaderChunk[ 'tonemapping_pars_fragment' ] : '', // this code is required here because it is used by the toneMapping() function defined below

                ( parameters.toneMapping !== NoToneMapping ) ? getToneMappingFunction( 'toneMapping', parameters.toneMapping ) : '',


                parameters.dithering ? '#define DITHERING' : '',

                parameters.opaque ? '#define OPAQUE' : '',


                ShaderChunk[ 'colorspace_pars_fragment' ], // this code is required here because it is used by the various encoding/decoding function defined below

                getTexelEncodingFunction( 'linearToOutputTexel', parameters.outputColorSpace ),


                parameters.useDepthPacking ? '#define DEPTH_PACKING ' + parameters.depthPacking : '',


                '\n'


            ].filter( filterEmptyLine ).join( '\n' );


        }


        vertexShader = resolveIncludes( vertexShader );

        vertexShader = replaceLightNums( vertexShader, parameters );

        vertexShader = replaceClippingPlaneNums( vertexShader, parameters );


        fragmentShader = resolveIncludes( fragmentShader );

        fragmentShader = replaceLightNums( fragmentShader, parameters );

        fragmentShader = replaceClippingPlaneNums( fragmentShader, parameters );


        vertexShader = unrollLoops( vertexShader );

        fragmentShader = unrollLoops( fragmentShader );


        if ( parameters.isWebGL2 && parameters.isRawShaderMaterial !== true ) {


            // GLSL 3.0 conversion for built-in materials and ShaderMaterial


            versionString = '#version 300 es\n';


            prefixVertex = [

                customVertexExtensions,

                'precision mediump sampler2DArray;',

                '#define attribute in',

                '#define varying out',

                '#define texture2D texture'

            ].join( '\n' ) + '\n' + prefixVertex;


            prefixFragment = [

                'precision mediump sampler2DArray;',

                '#define varying in',

                ( parameters.glslVersion === GLSL3 ) ? '' : 'layout(location = 0) out highp vec4 pc_fragColor;',

                ( parameters.glslVersion === GLSL3 ) ? '' : '#define gl_FragColor pc_fragColor',

                '#define gl_FragDepthEXT gl_FragDepth',

                '#define texture2D texture',

                '#define textureCube texture',

                '#define texture2DProj textureProj',

                '#define texture2DLodEXT textureLod',

                '#define texture2DProjLodEXT textureProjLod',

                '#define textureCubeLodEXT textureLod',

                '#define texture2DGradEXT textureGrad',

                '#define texture2DProjGradEXT textureProjGrad',

                '#define textureCubeGradEXT textureGrad'

            ].join( '\n' ) + '\n' + prefixFragment;


        }


        const vertexGlsl = versionString + prefixVertex + vertexShader;

        const fragmentGlsl = versionString + prefixFragment + fragmentShader;


        // console.log( '*VERTEX*', vertexGlsl );

        // console.log( '*FRAGMENT*', fragmentGlsl );


        const glVertexShader = WebGLShader( gl, gl.VERTEX_SHADER, vertexGlsl );

        const glFragmentShader = WebGLShader( gl, gl.FRAGMENT_SHADER, fragmentGlsl );


        gl.attachShader( program, glVertexShader );

        gl.attachShader( program, glFragmentShader );


        // Force a particular attribute to index 0.


        if ( parameters.index0AttributeName !== undefined ) {


            gl.bindAttribLocation( program, 0, parameters.index0AttributeName );


        } else if ( parameters.morphTargets === true ) {


            // programs with morphTargets displace position out of attribute 0

            gl.bindAttribLocation( program, 0, 'position' );


        }


        gl.linkProgram( program );


        function onFirstUse( self ) {


            // check for link errors

            if ( renderer.debug.checkShaderErrors ) {


                const programLog = gl.getProgramInfoLog( program ).trim();

                const vertexLog = gl.getShaderInfoLog( glVertexShader ).trim();

                const fragmentLog = gl.getShaderInfoLog( glFragmentShader ).trim();


                let runnable = true;

                let haveDiagnostics = true;


                if ( gl.getProgramParameter( program, gl.LINK_STATUS ) === false ) {


                    runnable = false;


                    if ( typeof renderer.debug.onShaderError === 'function' ) {


                        renderer.debug.onShaderError( gl, program, glVertexShader, glFragmentShader );


                    } else {


                        // default error reporting


                        const vertexErrors = getShaderErrors( gl, glVertexShader, 'vertex' );

                        const fragmentErrors = getShaderErrors( gl, glFragmentShader, 'fragment' );


                        console.error(

                            'THREE.WebGLProgram: Shader Error ' + gl.getError() + ' - ' +

                            'VALIDATE_STATUS ' + gl.getProgramParameter( program, gl.VALIDATE_STATUS ) + '\n\n' +

                            'Program Info Log: ' + programLog + '\n' +

                            vertexErrors + '\n' +

                            fragmentErrors

                        );


                    }


                } else if ( programLog !== '' ) {


                    console.warn( 'THREE.WebGLProgram: Program Info Log:', programLog );


                } else if ( vertexLog === '' || fragmentLog === '' ) {


                    haveDiagnostics = false;


                }


                if ( haveDiagnostics ) {


                    self.diagnostics = {


                        runnable: runnable,


                        programLog: programLog,


                        vertexShader: {


                            log: vertexLog,

                            prefix: prefixVertex


                        },


                        fragmentShader: {


                            log: fragmentLog,

                            prefix: prefixFragment


                        }


                    };


                }


            }


            // Clean up


            // Crashes in iOS9 and iOS10. #18402

            // gl.detachShader( program, glVertexShader );

            // gl.detachShader( program, glFragmentShader );


            gl.deleteShader( glVertexShader );

            gl.deleteShader( glFragmentShader );


            cachedUniforms = new WebGLUniforms( gl, program );

            cachedAttributes = fetchAttributeLocations( gl, program );


        }


        // set up caching for uniform locations


        let cachedUniforms;


        this.getUniforms = function () {


            if ( cachedUniforms === undefined ) {


                // Populates cachedUniforms and cachedAttributes

                onFirstUse( this );


            }


            return cachedUniforms;


        };


        // set up caching for attribute locations


        let cachedAttributes;


        this.getAttributes = function () {


            if ( cachedAttributes === undefined ) {


                // Populates cachedAttributes and cachedUniforms

                onFirstUse( this );


            }


            return cachedAttributes;


        };


        // indicate when the program is ready to be used. if the KHR_parallel_shader_compile extension isn't supported,

        // flag the program as ready immediately. It may cause a stall when it's first used.


        let programReady = ( parameters.rendererExtensionParallelShaderCompile === false );


        this.isReady = function () {


            if ( programReady === false ) {


                programReady = gl.getProgramParameter( program, COMPLETION_STATUS_KHR );


            }


            return programReady;


        };


        // free resource


        this.destroy = function () {


            bindingStates.releaseStatesOfProgram( this );


            gl.deleteProgram( program );

            this.program = undefined;


        };


        //


        this.type = parameters.shaderType;

        this.name = parameters.shaderName;

        this.id = programIdCount ++;

        this.cacheKey = cacheKey;

        this.usedTimes = 1;

        this.program = program;

        this.vertexShader = glVertexShader;

        this.fragmentShader = glFragmentShader;


        return this;


    }


    let _id$1 = 0;


    class WebGLShaderCache {


        constructor() {


            this.shaderCache = new Map();

            this.materialCache = new Map();


        }


        update( material ) {


            const vertexShader = material.vertexShader;

            const fragmentShader = material.fragmentShader;


            const vertexShaderStage = this._getShaderStage( vertexShader );

            const fragmentShaderStage = this._getShaderStage( fragmentShader );


            const materialShaders = this._getShaderCacheForMaterial( material );


            if ( materialShaders.has( vertexShaderStage ) === false ) {


                materialShaders.add( vertexShaderStage );

                vertexShaderStage.usedTimes ++;


            }


            if ( materialShaders.has( fragmentShaderStage ) === false ) {


                materialShaders.add( fragmentShaderStage );

                fragmentShaderStage.usedTimes ++;


            }


            return this;


        }


        remove( material ) {


            const materialShaders = this.materialCache.get( material );


            for ( const shaderStage of materialShaders ) {


                shaderStage.usedTimes --;


                if ( shaderStage.usedTimes === 0 ) this.shaderCache.delete( shaderStage.code );


            }


            this.materialCache.delete( material );


            return this;


        }


        getVertexShaderID( material ) {


            return this._getShaderStage( material.vertexShader ).id;


        }


        getFragmentShaderID( material ) {


            return this._getShaderStage( material.fragmentShader ).id;


        }


        dispose() {


            this.shaderCache.clear();

            this.materialCache.clear();


        }


        _getShaderCacheForMaterial( material ) {


            const cache = this.materialCache;

            let set = cache.get( material );


            if ( set === undefined ) {


                set = new Set();

                cache.set( material, set );


            }


            return set;


        }


        _getShaderStage( code ) {


            const cache = this.shaderCache;

            let stage = cache.get( code );


            if ( stage === undefined ) {


                stage = new WebGLShaderStage( code );

                cache.set( code, stage );


            }


            return stage;


        }


    }


    class WebGLShaderStage {


        constructor( code ) {


            this.id = _id$1 ++;


            this.code = code;

            this.usedTimes = 0;


        }


    }


    function WebGLPrograms( renderer, cubemaps, cubeuvmaps, extensions, capabilities, bindingStates, clipping ) {


        const _programLayers = new Layers();

        const _customShaders = new WebGLShaderCache();

        const programs = [];


        const IS_WEBGL2 = capabilities.isWebGL2;

        const logarithmicDepthBuffer = capabilities.logarithmicDepthBuffer;

        const SUPPORTS_VERTEX_TEXTURES = capabilities.vertexTextures;


        let precision = capabilities.precision;


        const shaderIDs = {

            MeshDepthMaterial: 'depth',

            MeshDistanceMaterial: 'distanceRGBA',

            MeshNormalMaterial: 'normal',

            MeshBasicMaterial: 'basic',

            MeshLambertMaterial: 'lambert',

            MeshPhongMaterial: 'phong',

            MeshToonMaterial: 'toon',

            MeshStandardMaterial: 'physical',

            MeshPhysicalMaterial: 'physical',

            MeshMatcapMaterial: 'matcap',

            LineBasicMaterial: 'basic',

            LineDashedMaterial: 'dashed',

            PointsMaterial: 'points',

            ShadowMaterial: 'shadow',

            SpriteMaterial: 'sprite'

        };


        function getChannel( value ) {


            if ( value === 0 ) return 'uv';


            return `uv${ value }`;


        }


        function getParameters( material, lights, shadows, scene, object ) {


            const fog = scene.fog;

            const geometry = object.geometry;

            const environment = material.isMeshStandardMaterial ? scene.environment : null;


            const envMap = ( material.isMeshStandardMaterial ? cubeuvmaps : cubemaps ).get( material.envMap || environment );

            const envMapCubeUVHeight = ( !! envMap ) && ( envMap.mapping === CubeUVReflectionMapping ) ? envMap.image.height : null;


            const shaderID = shaderIDs[ material.type ];


            // heuristics to create shader parameters according to lights in the scene

            // (not to blow over maxLights budget)


            if ( material.precision !== null ) {


                precision = capabilities.getMaxPrecision( material.precision );


                if ( precision !== material.precision ) {


                    console.warn( 'THREE.WebGLProgram.getParameters:', material.precision, 'not supported, using', precision, 'instead.' );


                }


            }


            //


            const morphAttribute = geometry.morphAttributes.position || geometry.morphAttributes.normal || geometry.morphAttributes.color;

            const morphTargetsCount = ( morphAttribute !== undefined ) ? morphAttribute.length : 0;


            let morphTextureStride = 0;


            if ( geometry.morphAttributes.position !== undefined ) morphTextureStride = 1;

            if ( geometry.morphAttributes.normal !== undefined ) morphTextureStride = 2;

            if ( geometry.morphAttributes.color !== undefined ) morphTextureStride = 3;


            //


            let vertexShader, fragmentShader;

            let customVertexShaderID, customFragmentShaderID;


            if ( shaderID ) {


                const shader = ShaderLib[ shaderID ];


                vertexShader = shader.vertexShader;

                fragmentShader = shader.fragmentShader;


            } else {


                vertexShader = material.vertexShader;

                fragmentShader = material.fragmentShader;


                _customShaders.update( material );


                customVertexShaderID = _customShaders.getVertexShaderID( material );

                customFragmentShaderID = _customShaders.getFragmentShaderID( material );


            }


            const currentRenderTarget = renderer.getRenderTarget();


            const IS_INSTANCEDMESH = object.isInstancedMesh === true;

            const IS_BATCHEDMESH = object.isBatchedMesh === true;


            const HAS_MAP = !! material.map;

            const HAS_MATCAP = !! material.matcap;

            const HAS_ENVMAP = !! envMap;

            const HAS_AOMAP = !! material.aoMap;

            const HAS_LIGHTMAP = !! material.lightMap;

            const HAS_BUMPMAP = !! material.bumpMap;

            const HAS_NORMALMAP = !! material.normalMap;

            const HAS_DISPLACEMENTMAP = !! material.displacementMap;

            const HAS_EMISSIVEMAP = !! material.emissiveMap;


            const HAS_METALNESSMAP = !! material.metalnessMap;

            const HAS_ROUGHNESSMAP = !! material.roughnessMap;


            const HAS_ANISOTROPY = material.anisotropy > 0;

            const HAS_CLEARCOAT = material.clearcoat > 0;

            const HAS_IRIDESCENCE = material.iridescence > 0;

            const HAS_SHEEN = material.sheen > 0;

            const HAS_TRANSMISSION = material.transmission > 0;


            const HAS_ANISOTROPYMAP = HAS_ANISOTROPY && !! material.anisotropyMap;


            const HAS_CLEARCOATMAP = HAS_CLEARCOAT && !! material.clearcoatMap;

            const HAS_CLEARCOAT_NORMALMAP = HAS_CLEARCOAT && !! material.clearcoatNormalMap;

            const HAS_CLEARCOAT_ROUGHNESSMAP = HAS_CLEARCOAT && !! material.clearcoatRoughnessMap;


            const HAS_IRIDESCENCEMAP = HAS_IRIDESCENCE && !! material.iridescenceMap;

            const HAS_IRIDESCENCE_THICKNESSMAP = HAS_IRIDESCENCE && !! material.iridescenceThicknessMap;


            const HAS_SHEEN_COLORMAP = HAS_SHEEN && !! material.sheenColorMap;

            const HAS_SHEEN_ROUGHNESSMAP = HAS_SHEEN && !! material.sheenRoughnessMap;


            const HAS_SPECULARMAP = !! material.specularMap;

            const HAS_SPECULAR_COLORMAP = !! material.specularColorMap;

            const HAS_SPECULAR_INTENSITYMAP = !! material.specularIntensityMap;


            const HAS_TRANSMISSIONMAP = HAS_TRANSMISSION && !! material.transmissionMap;

            const HAS_THICKNESSMAP = HAS_TRANSMISSION && !! material.thicknessMap;


            const HAS_GRADIENTMAP = !! material.gradientMap;


            const HAS_ALPHAMAP = !! material.alphaMap;


            const HAS_ALPHATEST = material.alphaTest > 0;


            const HAS_ALPHAHASH = !! material.alphaHash;


            const HAS_EXTENSIONS = !! material.extensions;


            const HAS_ATTRIBUTE_UV1 = !! geometry.attributes.uv1;

            const HAS_ATTRIBUTE_UV2 = !! geometry.attributes.uv2;

            const HAS_ATTRIBUTE_UV3 = !! geometry.attributes.uv3;


            let toneMapping = NoToneMapping;


            if ( material.toneMapped ) {


                if ( currentRenderTarget === null || currentRenderTarget.isXRRenderTarget === true ) {


                    toneMapping = renderer.toneMapping;


                }


            }


            const parameters = {


                isWebGL2: IS_WEBGL2,


                shaderID: shaderID,

                shaderType: material.type,

                shaderName: material.name,


                vertexShader: vertexShader,

                fragmentShader: fragmentShader,

                defines: material.defines,


                customVertexShaderID: customVertexShaderID,

                customFragmentShaderID: customFragmentShaderID,


                isRawShaderMaterial: material.isRawShaderMaterial === true,

                glslVersion: material.glslVersion,


                precision: precision,


                batching: IS_BATCHEDMESH,

                instancing: IS_INSTANCEDMESH,

                instancingColor: IS_INSTANCEDMESH && object.instanceColor !== null,


                supportsVertexTextures: SUPPORTS_VERTEX_TEXTURES,

                outputColorSpace: ( currentRenderTarget === null ) ? renderer.outputColorSpace : ( currentRenderTarget.isXRRenderTarget === true ? currentRenderTarget.texture.colorSpace : LinearSRGBColorSpace ),


                map: HAS_MAP,

                matcap: HAS_MATCAP,

                envMap: HAS_ENVMAP,

                envMapMode: HAS_ENVMAP && envMap.mapping,

                envMapCubeUVHeight: envMapCubeUVHeight,

                aoMap: HAS_AOMAP,

                lightMap: HAS_LIGHTMAP,

                bumpMap: HAS_BUMPMAP,

                normalMap: HAS_NORMALMAP,

                displacementMap: SUPPORTS_VERTEX_TEXTURES && HAS_DISPLACEMENTMAP,

                emissiveMap: HAS_EMISSIVEMAP,


                normalMapObjectSpace: HAS_NORMALMAP && material.normalMapType === ObjectSpaceNormalMap,

                normalMapTangentSpace: HAS_NORMALMAP && material.normalMapType === TangentSpaceNormalMap,


                metalnessMap: HAS_METALNESSMAP,

                roughnessMap: HAS_ROUGHNESSMAP,


                anisotropy: HAS_ANISOTROPY,

                anisotropyMap: HAS_ANISOTROPYMAP,


                clearcoat: HAS_CLEARCOAT,

                clearcoatMap: HAS_CLEARCOATMAP,

                clearcoatNormalMap: HAS_CLEARCOAT_NORMALMAP,

                clearcoatRoughnessMap: HAS_CLEARCOAT_ROUGHNESSMAP,


                iridescence: HAS_IRIDESCENCE,

                iridescenceMap: HAS_IRIDESCENCEMAP,

                iridescenceThicknessMap: HAS_IRIDESCENCE_THICKNESSMAP,


                sheen: HAS_SHEEN,

                sheenColorMap: HAS_SHEEN_COLORMAP,

                sheenRoughnessMap: HAS_SHEEN_ROUGHNESSMAP,


                specularMap: HAS_SPECULARMAP,

                specularColorMap: HAS_SPECULAR_COLORMAP,

                specularIntensityMap: HAS_SPECULAR_INTENSITYMAP,


                transmission: HAS_TRANSMISSION,

                transmissionMap: HAS_TRANSMISSIONMAP,

                thicknessMap: HAS_THICKNESSMAP,


                gradientMap: HAS_GRADIENTMAP,


                opaque: material.transparent === false && material.blending === NormalBlending,


                alphaMap: HAS_ALPHAMAP,

                alphaTest: HAS_ALPHATEST,

                alphaHash: HAS_ALPHAHASH,


                combine: material.combine,


                //


                mapUv: HAS_MAP && getChannel( material.map.channel ),

                aoMapUv: HAS_AOMAP && getChannel( material.aoMap.channel ),

                lightMapUv: HAS_LIGHTMAP && getChannel( material.lightMap.channel ),

                bumpMapUv: HAS_BUMPMAP && getChannel( material.bumpMap.channel ),

                normalMapUv: HAS_NORMALMAP && getChannel( material.normalMap.channel ),

                displacementMapUv: HAS_DISPLACEMENTMAP && getChannel( material.displacementMap.channel ),

                emissiveMapUv: HAS_EMISSIVEMAP && getChannel( material.emissiveMap.channel ),


                metalnessMapUv: HAS_METALNESSMAP && getChannel( material.metalnessMap.channel ),

                roughnessMapUv: HAS_ROUGHNESSMAP && getChannel( material.roughnessMap.channel ),


                anisotropyMapUv: HAS_ANISOTROPYMAP && getChannel( material.anisotropyMap.channel ),


                clearcoatMapUv: HAS_CLEARCOATMAP && getChannel( material.clearcoatMap.channel ),

                clearcoatNormalMapUv: HAS_CLEARCOAT_NORMALMAP && getChannel( material.clearcoatNormalMap.channel ),

                clearcoatRoughnessMapUv: HAS_CLEARCOAT_ROUGHNESSMAP && getChannel( material.clearcoatRoughnessMap.channel ),


                iridescenceMapUv: HAS_IRIDESCENCEMAP && getChannel( material.iridescenceMap.channel ),

                iridescenceThicknessMapUv: HAS_IRIDESCENCE_THICKNESSMAP && getChannel( material.iridescenceThicknessMap.channel ),


                sheenColorMapUv: HAS_SHEEN_COLORMAP && getChannel( material.sheenColorMap.channel ),

                sheenRoughnessMapUv: HAS_SHEEN_ROUGHNESSMAP && getChannel( material.sheenRoughnessMap.channel ),


                specularMapUv: HAS_SPECULARMAP && getChannel( material.specularMap.channel ),

                specularColorMapUv: HAS_SPECULAR_COLORMAP && getChannel( material.specularColorMap.channel ),

                specularIntensityMapUv: HAS_SPECULAR_INTENSITYMAP && getChannel( material.specularIntensityMap.channel ),


                transmissionMapUv: HAS_TRANSMISSIONMAP && getChannel( material.transmissionMap.channel ),

                thicknessMapUv: HAS_THICKNESSMAP && getChannel( material.thicknessMap.channel ),


                alphaMapUv: HAS_ALPHAMAP && getChannel( material.alphaMap.channel ),


                //


                vertexTangents: !! geometry.attributes.tangent && ( HAS_NORMALMAP || HAS_ANISOTROPY ),

                vertexColors: material.vertexColors,

                vertexAlphas: material.vertexColors === true && !! geometry.attributes.color && geometry.attributes.color.itemSize === 4,

                vertexUv1s: HAS_ATTRIBUTE_UV1,

                vertexUv2s: HAS_ATTRIBUTE_UV2,

                vertexUv3s: HAS_ATTRIBUTE_UV3,


                pointsUvs: object.isPoints === true && !! geometry.attributes.uv && ( HAS_MAP || HAS_ALPHAMAP ),


                fog: !! fog,

                useFog: material.fog === true,

                fogExp2: ( fog && fog.isFogExp2 ),


                flatShading: material.flatShading === true,


                sizeAttenuation: material.sizeAttenuation === true,

                logarithmicDepthBuffer: logarithmicDepthBuffer,


                skinning: object.isSkinnedMesh === true,


                morphTargets: geometry.morphAttributes.position !== undefined,

                morphNormals: geometry.morphAttributes.normal !== undefined,

                morphColors: geometry.morphAttributes.color !== undefined,

                morphTargetsCount: morphTargetsCount,

                morphTextureStride: morphTextureStride,


                numDirLights: lights.directional.length,

                numPointLights: lights.point.length,

                numSpotLights: lights.spot.length,

                numSpotLightMaps: lights.spotLightMap.length,

                numRectAreaLights: lights.rectArea.length,

                numHemiLights: lights.hemi.length,


                numDirLightShadows: lights.directionalShadowMap.length,

                numPointLightShadows: lights.pointShadowMap.length,

                numSpotLightShadows: lights.spotShadowMap.length,

                numSpotLightShadowsWithMaps: lights.numSpotLightShadowsWithMaps,


                numLightProbes: lights.numLightProbes,


                numClippingPlanes: clipping.numPlanes,

                numClipIntersection: clipping.numIntersection,


                dithering: material.dithering,


                shadowMapEnabled: renderer.shadowMap.enabled && shadows.length > 0,

                shadowMapType: renderer.shadowMap.type,


                toneMapping: toneMapping,

                useLegacyLights: renderer._useLegacyLights,


                decodeVideoTexture: HAS_MAP && ( material.map.isVideoTexture === true ) && ( ColorManagement.getTransfer( material.map.colorSpace ) === SRGBTransfer ),


                premultipliedAlpha: material.premultipliedAlpha,


                doubleSided: material.side === DoubleSide,

                flipSided: material.side === BackSide,


                useDepthPacking: material.depthPacking >= 0,

                depthPacking: material.depthPacking || 0,


                index0AttributeName: material.index0AttributeName,


                extensionDerivatives: HAS_EXTENSIONS && material.extensions.derivatives === true,

                extensionFragDepth: HAS_EXTENSIONS && material.extensions.fragDepth === true,

                extensionDrawBuffers: HAS_EXTENSIONS && material.extensions.drawBuffers === true,

                extensionShaderTextureLOD: HAS_EXTENSIONS && material.extensions.shaderTextureLOD === true,

                extensionClipCullDistance: HAS_EXTENSIONS && material.extensions.clipCullDistance && extensions.has( 'WEBGL_clip_cull_distance' ),


                rendererExtensionFragDepth: IS_WEBGL2 || extensions.has( 'EXT_frag_depth' ),

                rendererExtensionDrawBuffers: IS_WEBGL2 || extensions.has( 'WEBGL_draw_buffers' ),

                rendererExtensionShaderTextureLod: IS_WEBGL2 || extensions.has( 'EXT_shader_texture_lod' ),

                rendererExtensionParallelShaderCompile: extensions.has( 'KHR_parallel_shader_compile' ),


                customProgramCacheKey: material.customProgramCacheKey()


            };


            return parameters;


        }


        function getProgramCacheKey( parameters ) {


            const array = [];


            if ( parameters.shaderID ) {


                array.push( parameters.shaderID );


            } else {


                array.push( parameters.customVertexShaderID );

                array.push( parameters.customFragmentShaderID );


            }


            if ( parameters.defines !== undefined ) {


                for ( const name in parameters.defines ) {


                    array.push( name );

                    array.push( parameters.defines[ name ] );


                }


            }


            if ( parameters.isRawShaderMaterial === false ) {


                getProgramCacheKeyParameters( array, parameters );

                getProgramCacheKeyBooleans( array, parameters );

                array.push( renderer.outputColorSpace );


            }


            array.push( parameters.customProgramCacheKey );


            return array.join();


        }


        function getProgramCacheKeyParameters( array, parameters ) {


            array.push( parameters.precision );

            array.push( parameters.outputColorSpace );

            array.push( parameters.envMapMode );

            array.push( parameters.envMapCubeUVHeight );

            array.push( parameters.mapUv );

            array.push( parameters.alphaMapUv );

            array.push( parameters.lightMapUv );

            array.push( parameters.aoMapUv );

            array.push( parameters.bumpMapUv );

            array.push( parameters.normalMapUv );

            array.push( parameters.displacementMapUv );

            array.push( parameters.emissiveMapUv );

            array.push( parameters.metalnessMapUv );

            array.push( parameters.roughnessMapUv );

            array.push( parameters.anisotropyMapUv );

            array.push( parameters.clearcoatMapUv );

            array.push( parameters.clearcoatNormalMapUv );

            array.push( parameters.clearcoatRoughnessMapUv );

            array.push( parameters.iridescenceMapUv );

            array.push( parameters.iridescenceThicknessMapUv );

            array.push( parameters.sheenColorMapUv );

            array.push( parameters.sheenRoughnessMapUv );

            array.push( parameters.specularMapUv );

            array.push( parameters.specularColorMapUv );

            array.push( parameters.specularIntensityMapUv );

            array.push( parameters.transmissionMapUv );

            array.push( parameters.thicknessMapUv );

            array.push( parameters.combine );

            array.push( parameters.fogExp2 );

            array.push( parameters.sizeAttenuation );

            array.push( parameters.morphTargetsCount );

            array.push( parameters.morphAttributeCount );

            array.push( parameters.numDirLights );

            array.push( parameters.numPointLights );

            array.push( parameters.numSpotLights );

            array.push( parameters.numSpotLightMaps );

            array.push( parameters.numHemiLights );

            array.push( parameters.numRectAreaLights );

            array.push( parameters.numDirLightShadows );

            array.push( parameters.numPointLightShadows );

            array.push( parameters.numSpotLightShadows );

            array.push( parameters.numSpotLightShadowsWithMaps );

            array.push( parameters.numLightProbes );

            array.push( parameters.shadowMapType );

            array.push( parameters.toneMapping );

            array.push( parameters.numClippingPlanes );

            array.push( parameters.numClipIntersection );

            array.push( parameters.depthPacking );


        }


        function getProgramCacheKeyBooleans( array, parameters ) {


            _programLayers.disableAll();


            if ( parameters.isWebGL2 )

                _programLayers.enable( 0 );

            if ( parameters.supportsVertexTextures )

                _programLayers.enable( 1 );

            if ( parameters.instancing )

                _programLayers.enable( 2 );

            if ( parameters.instancingColor )

                _programLayers.enable( 3 );

            if ( parameters.matcap )

                _programLayers.enable( 4 );

            if ( parameters.envMap )

                _programLayers.enable( 5 );

            if ( parameters.normalMapObjectSpace )

                _programLayers.enable( 6 );

            if ( parameters.normalMapTangentSpace )

                _programLayers.enable( 7 );

            if ( parameters.clearcoat )

                _programLayers.enable( 8 );

            if ( parameters.iridescence )

                _programLayers.enable( 9 );

            if ( parameters.alphaTest )

                _programLayers.enable( 10 );

            if ( parameters.vertexColors )

                _programLayers.enable( 11 );

            if ( parameters.vertexAlphas )

                _programLayers.enable( 12 );

            if ( parameters.vertexUv1s )

                _programLayers.enable( 13 );

            if ( parameters.vertexUv2s )

                _programLayers.enable( 14 );

            if ( parameters.vertexUv3s )

                _programLayers.enable( 15 );

            if ( parameters.vertexTangents )

                _programLayers.enable( 16 );

            if ( parameters.anisotropy )

                _programLayers.enable( 17 );

            if ( parameters.alphaHash )

                _programLayers.enable( 18 );

            if ( parameters.batching )

                _programLayers.enable( 19 );


            array.push( _programLayers.mask );

            _programLayers.disableAll();


            if ( parameters.fog )

                _programLayers.enable( 0 );

            if ( parameters.useFog )

                _programLayers.enable( 1 );

            if ( parameters.flatShading )

                _programLayers.enable( 2 );

            if ( parameters.logarithmicDepthBuffer )

                _programLayers.enable( 3 );

            if ( parameters.skinning )

                _programLayers.enable( 4 );

            if ( parameters.morphTargets )

                _programLayers.enable( 5 );

            if ( parameters.morphNormals )

                _programLayers.enable( 6 );

            if ( parameters.morphColors )

                _programLayers.enable( 7 );

            if ( parameters.premultipliedAlpha )

                _programLayers.enable( 8 );

            if ( parameters.shadowMapEnabled )

                _programLayers.enable( 9 );

            if ( parameters.useLegacyLights )

                _programLayers.enable( 10 );

            if ( parameters.doubleSided )

                _programLayers.enable( 11 );

            if ( parameters.flipSided )

                _programLayers.enable( 12 );

            if ( parameters.useDepthPacking )

                _programLayers.enable( 13 );

            if ( parameters.dithering )

                _programLayers.enable( 14 );

            if ( parameters.transmission )

                _programLayers.enable( 15 );

            if ( parameters.sheen )

                _programLayers.enable( 16 );

            if ( parameters.opaque )

                _programLayers.enable( 17 );

            if ( parameters.pointsUvs )

                _programLayers.enable( 18 );

            if ( parameters.decodeVideoTexture )

                _programLayers.enable( 19 );


            array.push( _programLayers.mask );


        }


        function getUniforms( material ) {


            const shaderID = shaderIDs[ material.type ];

            let uniforms;


            if ( shaderID ) {


                const shader = ShaderLib[ shaderID ];

                uniforms = UniformsUtils.clone( shader.uniforms );


            } else {


                uniforms = material.uniforms;


            }


            return uniforms;


        }


        function acquireProgram( parameters, cacheKey ) {


            let program;


            // Check if code has been already compiled

            for ( let p = 0, pl = programs.length; p < pl; p ++ ) {


                const preexistingProgram = programs[ p ];


                if ( preexistingProgram.cacheKey === cacheKey ) {


                    program = preexistingProgram;

                    ++ program.usedTimes;


                    break;


                }


            }


            if ( program === undefined ) {


                program = new WebGLProgram( renderer, cacheKey, parameters, bindingStates );

                programs.push( program );


            }


            return program;


        }


        function releaseProgram( program ) {


            if ( -- program.usedTimes === 0 ) {


                // Remove from unordered set

                const i = programs.indexOf( program );

                programs[ i ] = programs[ programs.length - 1 ];

                programs.pop();


                // Free WebGL resources

                program.destroy();


            }


        }


        function releaseShaderCache( material ) {


            _customShaders.remove( material );


        }


        function dispose() {


            _customShaders.dispose();


        }


        return {

            getParameters: getParameters,

            getProgramCacheKey: getProgramCacheKey,

            getUniforms: getUniforms,

            acquireProgram: acquireProgram,

            releaseProgram: releaseProgram,

            releaseShaderCache: releaseShaderCache,

            // Exposed for resource monitoring & error feedback via renderer.info:

            programs: programs,

            dispose: dispose

        };


    }


    function WebGLProperties() {


        let properties = new WeakMap();


        function get( object ) {


            let map = properties.get( object );


            if ( map === undefined ) {


                map = {};

                properties.set( object, map );


            }


            return map;


        }


        function remove( object ) {


            properties.delete( object );


        }


        function update( object, key, value ) {


            properties.get( object )[ key ] = value;


        }


        function dispose() {


            properties = new WeakMap();


        }


        return {

            get: get,

            remove: remove,

            update: update,

            dispose: dispose

        };


    }


    function painterSortStable( a, b ) {


        if ( a.groupOrder !== b.groupOrder ) {


            return a.groupOrder - b.groupOrder;


        } else if ( a.renderOrder !== b.renderOrder ) {


            return a.renderOrder - b.renderOrder;


        } else if ( a.material.id !== b.material.id ) {


            return a.material.id - b.material.id;


        } else if ( a.z !== b.z ) {


            return a.z - b.z;


        } else {


            return a.id - b.id;


        }


    }


    function reversePainterSortStable( a, b ) {


        if ( a.groupOrder !== b.groupOrder ) {


            return a.groupOrder - b.groupOrder;


        } else if ( a.renderOrder !== b.renderOrder ) {


            return a.renderOrder - b.renderOrder;


        } else if ( a.z !== b.z ) {


            return b.z - a.z;


        } else {


            return a.id - b.id;


        }


    }


    function WebGLRenderList() {


        const renderItems = [];

        let renderItemsIndex = 0;


        const opaque = [];

        const transmissive = [];

        const transparent = [];


        function init() {


            renderItemsIndex = 0;


            opaque.length = 0;

            transmissive.length = 0;

            transparent.length = 0;


        }


        function getNextRenderItem( object, geometry, material, groupOrder, z, group ) {


            let renderItem = renderItems[ renderItemsIndex ];


            if ( renderItem === undefined ) {


                renderItem = {

                    id: object.id,

                    object: object,

                    geometry: geometry,

                    material: material,

                    groupOrder: groupOrder,

                    renderOrder: object.renderOrder,

                    z: z,

                    group: group

                };


                renderItems[ renderItemsIndex ] = renderItem;


            } else {


                renderItem.id = object.id;

                renderItem.object = object;

                renderItem.geometry = geometry;

                renderItem.material = material;

                renderItem.groupOrder = groupOrder;

                renderItem.renderOrder = object.renderOrder;

                renderItem.z = z;

                renderItem.group = group;


            }


            renderItemsIndex ++;


            return renderItem;


        }


        function push( object, geometry, material, groupOrder, z, group ) {


            const renderItem = getNextRenderItem( object, geometry, material, groupOrder, z, group );


            if ( material.transmission > 0.0 ) {


                transmissive.push( renderItem );


            } else if ( material.transparent === true ) {


                transparent.push( renderItem );


            } else {


                opaque.push( renderItem );


            }


        }


        function unshift( object, geometry, material, groupOrder, z, group ) {


            const renderItem = getNextRenderItem( object, geometry, material, groupOrder, z, group );


            if ( material.transmission > 0.0 ) {


                transmissive.unshift( renderItem );


            } else if ( material.transparent === true ) {


                transparent.unshift( renderItem );


            } else {


                opaque.unshift( renderItem );


            }


        }


        function sort( customOpaqueSort, customTransparentSort ) {


            if ( opaque.length > 1 ) opaque.sort( customOpaqueSort || painterSortStable );

            if ( transmissive.length > 1 ) transmissive.sort( customTransparentSort || reversePainterSortStable );

            if ( transparent.length > 1 ) transparent.sort( customTransparentSort || reversePainterSortStable );


        }


        function finish() {


            // Clear references from inactive renderItems in the list


            for ( let i = renderItemsIndex, il = renderItems.length; i < il; i ++ ) {


                const renderItem = renderItems[ i ];


                if ( renderItem.id === null ) break;


                renderItem.id = null;

                renderItem.object = null;

                renderItem.geometry = null;

                renderItem.material = null;

                renderItem.group = null;


            }


        }


        return {


            opaque: opaque,

            transmissive: transmissive,

            transparent: transparent,


            init: init,

            push: push,

            unshift: unshift,

            finish: finish,


            sort: sort

        };


    }


    function WebGLRenderLists() {


        let lists = new WeakMap();


        function get( scene, renderCallDepth ) {


            const listArray = lists.get( scene );

            let list;


            if ( listArray === undefined ) {


                list = new WebGLRenderList();

                lists.set( scene, [ list ] );


            } else {


                if ( renderCallDepth >= listArray.length ) {


                    list = new WebGLRenderList();

                    listArray.push( list );


                } else {


                    list = listArray[ renderCallDepth ];


                }


            }


            return list;


        }


        function dispose() {


            lists = new WeakMap();


        }


        return {

            get: get,

            dispose: dispose

        };


    }


    function UniformsCache() {


        const lights = {};


        return {


            get: function ( light ) {


                if ( lights[ light.id ] !== undefined ) {


                    return lights[ light.id ];


                }


                let uniforms;


                switch ( light.type ) {


                    case 'DirectionalLight':

                        uniforms = {

                            direction: new Vector3(),

                            color: new Color()

                        };

                        break;


                    case 'SpotLight':

                        uniforms = {

                            position: new Vector3(),

                            direction: new Vector3(),

                            color: new Color(),

                            distance: 0,

                            coneCos: 0,

                            penumbraCos: 0,

                            decay: 0

                        };

                        break;


                    case 'PointLight':

                        uniforms = {

                            position: new Vector3(),

                            color: new Color(),

                            distance: 0,

                            decay: 0

                        };

                        break;


                    case 'HemisphereLight':

                        uniforms = {

                            direction: new Vector3(),

                            skyColor: new Color(),

                            groundColor: new Color()

                        };

                        break;


                    case 'RectAreaLight':

                        uniforms = {

                            color: new Color(),

                            position: new Vector3(),

                            halfWidth: new Vector3(),

                            halfHeight: new Vector3()

                        };

                        break;


                }


                lights[ light.id ] = uniforms;


                return uniforms;


            }


        };


    }


    function ShadowUniformsCache() {


        const lights = {};


        return {


            get: function ( light ) {


                if ( lights[ light.id ] !== undefined ) {


                    return lights[ light.id ];


                }


                let uniforms;


                switch ( light.type ) {


                    case 'DirectionalLight':

                        uniforms = {

                            shadowBias: 0,

                            shadowNormalBias: 0,

                            shadowRadius: 1,

                            shadowMapSize: new Vector2()

                        };

                        break;


                    case 'SpotLight':

                        uniforms = {

                            shadowBias: 0,

                            shadowNormalBias: 0,

                            shadowRadius: 1,

                            shadowMapSize: new Vector2()

                        };

                        break;


                    case 'PointLight':

                        uniforms = {

                            shadowBias: 0,

                            shadowNormalBias: 0,

                            shadowRadius: 1,

                            shadowMapSize: new Vector2(),

                            shadowCameraNear: 1,

                            shadowCameraFar: 1000

                        };

                        break;


                    // TODO (abelnation): set RectAreaLight shadow uniforms


                }


                lights[ light.id ] = uniforms;


                return uniforms;


            }


        };


    }


    let nextVersion = 0;


    function shadowCastingAndTexturingLightsFirst( lightA, lightB ) {


        return ( lightB.castShadow ? 2 : 0 ) - ( lightA.castShadow ? 2 : 0 ) + ( lightB.map ? 1 : 0 ) - ( lightA.map ? 1 : 0 );


    }


    function WebGLLights( extensions, capabilities ) {


        const cache = new UniformsCache();


        const shadowCache = ShadowUniformsCache();


        const state = {


            version: 0,


            hash: {

                directionalLength: - 1,

                pointLength: - 1,

                spotLength: - 1,

                rectAreaLength: - 1,

                hemiLength: - 1,


                numDirectionalShadows: - 1,

                numPointShadows: - 1,

                numSpotShadows: - 1,

                numSpotMaps: - 1,


                numLightProbes: - 1

            },


            ambient: [ 0, 0, 0 ],

            probe: [],

            directional: [],

            directionalShadow: [],

            directionalShadowMap: [],

            directionalShadowMatrix: [],

            spot: [],

            spotLightMap: [],

            spotShadow: [],

            spotShadowMap: [],

            spotLightMatrix: [],

            rectArea: [],

            rectAreaLTC1: null,

            rectAreaLTC2: null,

            point: [],

            pointShadow: [],

            pointShadowMap: [],

            pointShadowMatrix: [],

            hemi: [],

            numSpotLightShadowsWithMaps: 0,

            numLightProbes: 0


        };


        for ( let i = 0; i < 9; i ++ ) state.probe.push( new Vector3() );


        const vector3 = new Vector3();

        const matrix4 = new Matrix4();

        const matrix42 = new Matrix4();


        function setup( lights, useLegacyLights ) {


            let r = 0, g = 0, b = 0;


            for ( let i = 0; i < 9; i ++ ) state.probe[ i ].set( 0, 0, 0 );


            let directionalLength = 0;

            let pointLength = 0;

            let spotLength = 0;

            let rectAreaLength = 0;

            let hemiLength = 0;


            let numDirectionalShadows = 0;

            let numPointShadows = 0;

            let numSpotShadows = 0;

            let numSpotMaps = 0;

            let numSpotShadowsWithMaps = 0;


            let numLightProbes = 0;


            // ordering : [shadow casting + map texturing, map texturing, shadow casting, none ]

            lights.sort( shadowCastingAndTexturingLightsFirst );


            // artist-friendly light intensity scaling factor

            const scaleFactor = ( useLegacyLights === true ) ? Math.PI : 1;


            for ( let i = 0, l = lights.length; i < l; i ++ ) {


                const light = lights[ i ];


                const color = light.color;

                const intensity = light.intensity;

                const distance = light.distance;


                const shadowMap = ( light.shadow && light.shadow.map ) ? light.shadow.map.texture : null;


                if ( light.isAmbientLight ) {


                    r += color.r * intensity * scaleFactor;

                    g += color.g * intensity * scaleFactor;

                    b += color.b * intensity * scaleFactor;


                } else if ( light.isLightProbe ) {


                    for ( let j = 0; j < 9; j ++ ) {


                        state.probe[ j ].addScaledVector( light.sh.coefficients[ j ], intensity );


                    }


                    numLightProbes ++;


                } else if ( light.isDirectionalLight ) {


                    const uniforms = cache.get( light );


                    uniforms.color.copy( light.color ).multiplyScalar( light.intensity * scaleFactor );


                    if ( light.castShadow ) {


                        const shadow = light.shadow;


                        const shadowUniforms = shadowCache.get( light );


                        shadowUniforms.shadowBias = shadow.bias;

                        shadowUniforms.shadowNormalBias = shadow.normalBias;

                        shadowUniforms.shadowRadius = shadow.radius;

                        shadowUniforms.shadowMapSize = shadow.mapSize;


                        state.directionalShadow[ directionalLength ] = shadowUniforms;

                        state.directionalShadowMap[ directionalLength ] = shadowMap;

                        state.directionalShadowMatrix[ directionalLength ] = light.shadow.matrix;


                        numDirectionalShadows ++;


                    }


                    state.directional[ directionalLength ] = uniforms;


                    directionalLength ++;


                } else if ( light.isSpotLight ) {


                    const uniforms = cache.get( light );


                    uniforms.position.setFromMatrixPosition( light.matrixWorld );


                    uniforms.color.copy( color ).multiplyScalar( intensity * scaleFactor );

                    uniforms.distance = distance;


                    uniforms.coneCos = Math.cos( light.angle );

                    uniforms.penumbraCos = Math.cos( light.angle * ( 1 - light.penumbra ) );

                    uniforms.decay = light.decay;


                    state.spot[ spotLength ] = uniforms;


                    const shadow = light.shadow;


                    if ( light.map ) {


                        state.spotLightMap[ numSpotMaps ] = light.map;

                        numSpotMaps ++;


                        // make sure the lightMatrix is up to date

                        // TODO : do it if required only

                        shadow.updateMatrices( light );


                        if ( light.castShadow ) numSpotShadowsWithMaps ++;


                    }


                    state.spotLightMatrix[ spotLength ] = shadow.matrix;


                    if ( light.castShadow ) {


                        const shadowUniforms = shadowCache.get( light );


                        shadowUniforms.shadowBias = shadow.bias;

                        shadowUniforms.shadowNormalBias = shadow.normalBias;

                        shadowUniforms.shadowRadius = shadow.radius;

                        shadowUniforms.shadowMapSize = shadow.mapSize;


                        state.spotShadow[ spotLength ] = shadowUniforms;

                        state.spotShadowMap[ spotLength ] = shadowMap;


                        numSpotShadows ++;


                    }


                    spotLength ++;


                } else if ( light.isRectAreaLight ) {


                    const uniforms = cache.get( light );


                    uniforms.color.copy( color ).multiplyScalar( intensity );


                    uniforms.halfWidth.set( light.width * 0.5, 0.0, 0.0 );

                    uniforms.halfHeight.set( 0.0, light.height * 0.5, 0.0 );


                    state.rectArea[ rectAreaLength ] = uniforms;


                    rectAreaLength ++;


                } else if ( light.isPointLight ) {


                    const uniforms = cache.get( light );


                    uniforms.color.copy( light.color ).multiplyScalar( light.intensity * scaleFactor );

                    uniforms.distance = light.distance;

                    uniforms.decay = light.decay;


                    if ( light.castShadow ) {


                        const shadow = light.shadow;


                        const shadowUniforms = shadowCache.get( light );


                        shadowUniforms.shadowBias = shadow.bias;

                        shadowUniforms.shadowNormalBias = shadow.normalBias;

                        shadowUniforms.shadowRadius = shadow.radius;

                        shadowUniforms.shadowMapSize = shadow.mapSize;

                        shadowUniforms.shadowCameraNear = shadow.camera.near;

                        shadowUniforms.shadowCameraFar = shadow.camera.far;


                        state.pointShadow[ pointLength ] = shadowUniforms;

                        state.pointShadowMap[ pointLength ] = shadowMap;

                        state.pointShadowMatrix[ pointLength ] = light.shadow.matrix;


                        numPointShadows ++;


                    }


                    state.point[ pointLength ] = uniforms;


                    pointLength ++;


                } else if ( light.isHemisphereLight ) {


                    const uniforms = cache.get( light );


                    uniforms.skyColor.copy( light.color ).multiplyScalar( intensity * scaleFactor );

                    uniforms.groundColor.copy( light.groundColor ).multiplyScalar( intensity * scaleFactor );


                    state.hemi[ hemiLength ] = uniforms;


                    hemiLength ++;


                }


            }


            if ( rectAreaLength > 0 ) {


                if ( capabilities.isWebGL2 ) {


                    // WebGL 2


                    if ( extensions.has( 'OES_texture_float_linear' ) === true ) {


                        state.rectAreaLTC1 = UniformsLib.LTC_FLOAT_1;

                        state.rectAreaLTC2 = UniformsLib.LTC_FLOAT_2;


                    } else {


                        state.rectAreaLTC1 = UniformsLib.LTC_HALF_1;

                        state.rectAreaLTC2 = UniformsLib.LTC_HALF_2;


                    }


                } else {


                    // WebGL 1


                    if ( extensions.has( 'OES_texture_float_linear' ) === true ) {


                        state.rectAreaLTC1 = UniformsLib.LTC_FLOAT_1;

                        state.rectAreaLTC2 = UniformsLib.LTC_FLOAT_2;


                    } else if ( extensions.has( 'OES_texture_half_float_linear' ) === true ) {


                        state.rectAreaLTC1 = UniformsLib.LTC_HALF_1;

                        state.rectAreaLTC2 = UniformsLib.LTC_HALF_2;


                    } else {


                        console.error( 'THREE.WebGLRenderer: Unable to use RectAreaLight. Missing WebGL extensions.' );


                    }


                }


            }


            state.ambient[ 0 ] = r;

            state.ambient[ 1 ] = g;

            state.ambient[ 2 ] = b;


            const hash = state.hash;


            if ( hash.directionalLength !== directionalLength ||

                hash.pointLength !== pointLength ||

                hash.spotLength !== spotLength ||

                hash.rectAreaLength !== rectAreaLength ||

                hash.hemiLength !== hemiLength ||

                hash.numDirectionalShadows !== numDirectionalShadows ||

                hash.numPointShadows !== numPointShadows ||

                hash.numSpotShadows !== numSpotShadows ||

                hash.numSpotMaps !== numSpotMaps ||

                hash.numLightProbes !== numLightProbes ) {


                state.directional.length = directionalLength;

                state.spot.length = spotLength;

                state.rectArea.length = rectAreaLength;

                state.point.length = pointLength;

                state.hemi.length = hemiLength;


                state.directionalShadow.length = numDirectionalShadows;

                state.directionalShadowMap.length = numDirectionalShadows;

                state.pointShadow.length = numPointShadows;

                state.pointShadowMap.length = numPointShadows;

                state.spotShadow.length = numSpotShadows;

                state.spotShadowMap.length = numSpotShadows;

                state.directionalShadowMatrix.length = numDirectionalShadows;

                state.pointShadowMatrix.length = numPointShadows;

                state.spotLightMatrix.length = numSpotShadows + numSpotMaps - numSpotShadowsWithMaps;

                state.spotLightMap.length = numSpotMaps;

                state.numSpotLightShadowsWithMaps = numSpotShadowsWithMaps;

                state.numLightProbes = numLightProbes;


                hash.directionalLength = directionalLength;

                hash.pointLength = pointLength;

                hash.spotLength = spotLength;

                hash.rectAreaLength = rectAreaLength;

                hash.hemiLength = hemiLength;


                hash.numDirectionalShadows = numDirectionalShadows;

                hash.numPointShadows = numPointShadows;

                hash.numSpotShadows = numSpotShadows;

                hash.numSpotMaps = numSpotMaps;


                hash.numLightProbes = numLightProbes;


                state.version = nextVersion ++;


            }


        }


        function setupView( lights, camera ) {


            let directionalLength = 0;

            let pointLength = 0;

            let spotLength = 0;

            let rectAreaLength = 0;

            let hemiLength = 0;


            const viewMatrix = camera.matrixWorldInverse;


            for ( let i = 0, l = lights.length; i < l; i ++ ) {


                const light = lights[ i ];


                if ( light.isDirectionalLight ) {


                    const uniforms = state.directional[ directionalLength ];


                    uniforms.direction.setFromMatrixPosition( light.matrixWorld );

                    vector3.setFromMatrixPosition( light.target.matrixWorld );

                    uniforms.direction.sub( vector3 );

                    uniforms.direction.transformDirection( viewMatrix );


                    directionalLength ++;


                } else if ( light.isSpotLight ) {


                    const uniforms = state.spot[ spotLength ];


                    uniforms.position.setFromMatrixPosition( light.matrixWorld );

                    uniforms.position.applyMatrix4( viewMatrix );


                    uniforms.direction.setFromMatrixPosition( light.matrixWorld );

                    vector3.setFromMatrixPosition( light.target.matrixWorld );

                    uniforms.direction.sub( vector3 );

                    uniforms.direction.transformDirection( viewMatrix );


                    spotLength ++;


                } else if ( light.isRectAreaLight ) {


                    const uniforms = state.rectArea[ rectAreaLength ];


                    uniforms.position.setFromMatrixPosition( light.matrixWorld );

                    uniforms.position.applyMatrix4( viewMatrix );


                    // extract local rotation of light to derive width/height half vectors

                    matrix42.identity();

                    matrix4.copy( light.matrixWorld );

                    matrix4.premultiply( viewMatrix );

                    matrix42.extractRotation( matrix4 );


                    uniforms.halfWidth.set( light.width * 0.5, 0.0, 0.0 );

                    uniforms.halfHeight.set( 0.0, light.height * 0.5, 0.0 );


                    uniforms.halfWidth.applyMatrix4( matrix42 );

                    uniforms.halfHeight.applyMatrix4( matrix42 );


                    rectAreaLength ++;


                } else if ( light.isPointLight ) {


                    const uniforms = state.point[ pointLength ];


                    uniforms.position.setFromMatrixPosition( light.matrixWorld );

                    uniforms.position.applyMatrix4( viewMatrix );


                    pointLength ++;


                } else if ( light.isHemisphereLight ) {


                    const uniforms = state.hemi[ hemiLength ];


                    uniforms.direction.setFromMatrixPosition( light.matrixWorld );

                    uniforms.direction.transformDirection( viewMatrix );


                    hemiLength ++;


                }


            }


        }


        return {

            setup: setup,

            setupView: setupView,

            state: state

        };


    }


    function WebGLRenderState( extensions, capabilities ) {


        const lights = new WebGLLights( extensions, capabilities );


        const lightsArray = [];

        const shadowsArray = [];


        function init() {


            lightsArray.length = 0;

            shadowsArray.length = 0;


        }


        function pushLight( light ) {


            lightsArray.push( light );


        }


        function pushShadow( shadowLight ) {


            shadowsArray.push( shadowLight );


        }


        function setupLights( useLegacyLights ) {


            lights.setup( lightsArray, useLegacyLights );


        }


        function setupLightsView( camera ) {


            lights.setupView( lightsArray, camera );


        }


        const state = {

            lightsArray: lightsArray,

            shadowsArray: shadowsArray,


            lights: lights

        };


        return {

            init: init,

            state: state,

            setupLights: setupLights,

            setupLightsView: setupLightsView,


            pushLight: pushLight,

            pushShadow: pushShadow

        };


    }


    function WebGLRenderStates( extensions, capabilities ) {


        let renderStates = new WeakMap();


        function get( scene, renderCallDepth = 0 ) {


            const renderStateArray = renderStates.get( scene );

            let renderState;


            if ( renderStateArray === undefined ) {


                renderState = new WebGLRenderState( extensions, capabilities );

                renderStates.set( scene, [ renderState ] );


            } else {


                if ( renderCallDepth >= renderStateArray.length ) {


                    renderState = new WebGLRenderState( extensions, capabilities );

                    renderStateArray.push( renderState );


                } else {


                    renderState = renderStateArray[ renderCallDepth ];


                }


            }


            return renderState;


        }


        function dispose() {


            renderStates = new WeakMap();


        }


        return {

            get: get,

            dispose: dispose

        };


    }


    class MeshDepthMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isMeshDepthMaterial = true;


            this.type = 'MeshDepthMaterial';


            this.depthPacking = BasicDepthPacking;


            this.map = null;


            this.alphaMap = null;


            this.displacementMap = null;

            this.displacementScale = 1;

            this.displacementBias = 0;


            this.wireframe = false;

            this.wireframeLinewidth = 1;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.depthPacking = source.depthPacking;


            this.map = source.map;


            this.alphaMap = source.alphaMap;


            this.displacementMap = source.displacementMap;

            this.displacementScale = source.displacementScale;

            this.displacementBias = source.displacementBias;


            this.wireframe = source.wireframe;

            this.wireframeLinewidth = source.wireframeLinewidth;


            return this;


        }


    }


    class MeshDistanceMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isMeshDistanceMaterial = true;


            this.type = 'MeshDistanceMaterial';


            this.map = null;


            this.alphaMap = null;


            this.displacementMap = null;

            this.displacementScale = 1;

            this.displacementBias = 0;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.map = source.map;


            this.alphaMap = source.alphaMap;


            this.displacementMap = source.displacementMap;

            this.displacementScale = source.displacementScale;

            this.displacementBias = source.displacementBias;


            return this;


        }


    }


    const vertex = "void main() {\n\tgl_Position = vec4( position, 1.0 );\n}";


    const fragment = "uniform sampler2D shadow_pass;\nuniform vec2 resolution;\nuniform float radius;\n#include <packing>\nvoid main() {\n\tconst float samples = float( VSM_SAMPLES );\n\tfloat mean = 0.0;\n\tfloat squared_mean = 0.0;\n\tfloat uvStride = samples <= 1.0 ? 0.0 : 2.0 / ( samples - 1.0 );\n\tfloat uvStart = samples <= 1.0 ? 0.0 : - 1.0;\n\tfor ( float i = 0.0; i < samples; i ++ ) {\n\t\tfloat uvOffset = uvStart + i * uvStride;\n\t\t#ifdef HORIZONTAL_PASS\n\t\t\tvec2 distribution = unpackRGBATo2Half( texture2D( shadow_pass, ( gl_FragCoord.xy + vec2( uvOffset, 0.0 ) * radius ) / resolution ) );\n\t\t\tmean += distribution.x;\n\t\t\tsquared_mean += distribution.y * distribution.y + distribution.x * distribution.x;\n\t\t#else\n\t\t\tfloat depth = unpackRGBAToDepth( texture2D( shadow_pass, ( gl_FragCoord.xy + vec2( 0.0, uvOffset ) * radius ) / resolution ) );\n\t\t\tmean += depth;\n\t\t\tsquared_mean += depth * depth;\n\t\t#endif\n\t}\n\tmean = mean / samples;\n\tsquared_mean = squared_mean / samples;\n\tfloat std_dev = sqrt( squared_mean - mean * mean );\n\tgl_FragColor = pack2HalfToRGBA( vec2( mean, std_dev ) );\n}";


    function WebGLShadowMap( _renderer, _objects, _capabilities ) {


        let _frustum = new Frustum();


        const _shadowMapSize = new Vector2(),

            _viewportSize = new Vector2(),


            _viewport = new Vector4(),


            _depthMaterial = new MeshDepthMaterial( { depthPacking: RGBADepthPacking } ),

            _distanceMaterial = new MeshDistanceMaterial(),


            _materialCache = {},


            _maxTextureSize = _capabilities.maxTextureSize;


        const shadowSide = { [ FrontSide ]: BackSide, [ BackSide ]: FrontSide, [ DoubleSide ]: DoubleSide };


        const shadowMaterialVertical = new ShaderMaterial( {

            defines: {

                VSM_SAMPLES: 8

            },

            uniforms: {

                shadow_pass: { value: null },

                resolution: { value: new Vector2() },

                radius: { value: 4.0 }

            },


            vertexShader: vertex,

            fragmentShader: fragment


        } );


        const shadowMaterialHorizontal = shadowMaterialVertical.clone();

        shadowMaterialHorizontal.defines.HORIZONTAL_PASS = 1;


        const fullScreenTri = new BufferGeometry();

        fullScreenTri.setAttribute(

            'position',

            new BufferAttribute(

                new Float32Array( [ - 1, - 1, 0.5, 3, - 1, 0.5, - 1, 3, 0.5 ] ),

                3

            )

        );


        const fullScreenMesh = new Mesh( fullScreenTri, shadowMaterialVertical );


        const scope = this;


        this.enabled = false;


        this.autoUpdate = true;

        this.needsUpdate = false;


        this.type = PCFShadowMap;

        let _previousType = this.type;


        this.render = function ( lights, scene, camera ) {


            if ( scope.enabled === false ) return;

            if ( scope.autoUpdate === false && scope.needsUpdate === false ) return;


            if ( lights.length === 0 ) return;


            const currentRenderTarget = _renderer.getRenderTarget();

            const activeCubeFace = _renderer.getActiveCubeFace();

            const activeMipmapLevel = _renderer.getActiveMipmapLevel();


            const _state = _renderer.state;


            // Set GL state for depth map.

            _state.setBlending( NoBlending );

            _state.buffers.color.setClear( 1, 1, 1, 1 );

            _state.buffers.depth.setTest( true );

            _state.setScissorTest( false );


            // check for shadow map type changes


            const toVSM = ( _previousType !== VSMShadowMap && this.type === VSMShadowMap );

            const fromVSM = ( _previousType === VSMShadowMap && this.type !== VSMShadowMap );


            // render depth map


            for ( let i = 0, il = lights.length; i < il; i ++ ) {


                const light = lights[ i ];

                const shadow = light.shadow;


                if ( shadow === undefined ) {


                    console.warn( 'THREE.WebGLShadowMap:', light, 'has no shadow.' );

                    continue;


                }


                if ( shadow.autoUpdate === false && shadow.needsUpdate === false ) continue;


                _shadowMapSize.copy( shadow.mapSize );


                const shadowFrameExtents = shadow.getFrameExtents();


                _shadowMapSize.multiply( shadowFrameExtents );


                _viewportSize.copy( shadow.mapSize );


                if ( _shadowMapSize.x > _maxTextureSize || _shadowMapSize.y > _maxTextureSize ) {


                    if ( _shadowMapSize.x > _maxTextureSize ) {


                        _viewportSize.x = Math.floor( _maxTextureSize / shadowFrameExtents.x );

                        _shadowMapSize.x = _viewportSize.x * shadowFrameExtents.x;

                        shadow.mapSize.x = _viewportSize.x;


                    }


                    if ( _shadowMapSize.y > _maxTextureSize ) {


                        _viewportSize.y = Math.floor( _maxTextureSize / shadowFrameExtents.y );

                        _shadowMapSize.y = _viewportSize.y * shadowFrameExtents.y;

                        shadow.mapSize.y = _viewportSize.y;


                    }


                }


                if ( shadow.map === null || toVSM === true || fromVSM === true ) {


                    const pars = ( this.type !== VSMShadowMap ) ? { minFilter: NearestFilter, magFilter: NearestFilter } : {};


                    if ( shadow.map !== null ) {


                        shadow.map.dispose();


                    }


                    shadow.map = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y, pars );

                    shadow.map.texture.name = light.name + '.shadowMap';


                    shadow.camera.updateProjectionMatrix();


                }


                _renderer.setRenderTarget( shadow.map );

                _renderer.clear();


                const viewportCount = shadow.getViewportCount();


                for ( let vp = 0; vp < viewportCount; vp ++ ) {


                    const viewport = shadow.getViewport( vp );


                    _viewport.set(

                        _viewportSize.x * viewport.x,

                        _viewportSize.y * viewport.y,

                        _viewportSize.x * viewport.z,

                        _viewportSize.y * viewport.w

                    );


                    _state.viewport( _viewport );


                    shadow.updateMatrices( light, vp );


                    _frustum = shadow.getFrustum();


                    renderObject( scene, camera, shadow.camera, light, this.type );


                }


                // do blur pass for VSM


                if ( shadow.isPointLightShadow !== true && this.type === VSMShadowMap ) {


                    VSMPass( shadow, camera );


                }


                shadow.needsUpdate = false;


            }


            _previousType = this.type;


            scope.needsUpdate = false;


            _renderer.setRenderTarget( currentRenderTarget, activeCubeFace, activeMipmapLevel );


        };


        function VSMPass( shadow, camera ) {


            const geometry = _objects.update( fullScreenMesh );


            if ( shadowMaterialVertical.defines.VSM_SAMPLES !== shadow.blurSamples ) {


                shadowMaterialVertical.defines.VSM_SAMPLES = shadow.blurSamples;

                shadowMaterialHorizontal.defines.VSM_SAMPLES = shadow.blurSamples;


                shadowMaterialVertical.needsUpdate = true;

                shadowMaterialHorizontal.needsUpdate = true;


            }


            if ( shadow.mapPass === null ) {


                shadow.mapPass = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y );


            }


            // vertical pass


            shadowMaterialVertical.uniforms.shadow_pass.value = shadow.map.texture;

            shadowMaterialVertical.uniforms.resolution.value = shadow.mapSize;

            shadowMaterialVertical.uniforms.radius.value = shadow.radius;

            _renderer.setRenderTarget( shadow.mapPass );

            _renderer.clear();

            _renderer.renderBufferDirect( camera, null, geometry, shadowMaterialVertical, fullScreenMesh, null );


            // horizontal pass


            shadowMaterialHorizontal.uniforms.shadow_pass.value = shadow.mapPass.texture;

            shadowMaterialHorizontal.uniforms.resolution.value = shadow.mapSize;

            shadowMaterialHorizontal.uniforms.radius.value = shadow.radius;

            _renderer.setRenderTarget( shadow.map );

            _renderer.clear();

            _renderer.renderBufferDirect( camera, null, geometry, shadowMaterialHorizontal, fullScreenMesh, null );


        }


        function getDepthMaterial( object, material, light, type ) {


            let result = null;


            const customMaterial = ( light.isPointLight === true ) ? object.customDistanceMaterial : object.customDepthMaterial;


            if ( customMaterial !== undefined ) {


                result = customMaterial;


            } else {


                result = ( light.isPointLight === true ) ? _distanceMaterial : _depthMaterial;


                if ( ( _renderer.localClippingEnabled && material.clipShadows === true && Array.isArray( material.clippingPlanes ) && material.clippingPlanes.length !== 0 ) ||

                    ( material.displacementMap && material.displacementScale !== 0 ) ||

                    ( material.alphaMap && material.alphaTest > 0 ) ||

                    ( material.map && material.alphaTest > 0 ) ) {


                    // in this case we need a unique material instance reflecting the

                    // appropriate state


                    const keyA = result.uuid, keyB = material.uuid;


                    let materialsForVariant = _materialCache[ keyA ];


                    if ( materialsForVariant === undefined ) {


                        materialsForVariant = {};

                        _materialCache[ keyA ] = materialsForVariant;


                    }


                    let cachedMaterial = materialsForVariant[ keyB ];


                    if ( cachedMaterial === undefined ) {


                        cachedMaterial = result.clone();

                        materialsForVariant[ keyB ] = cachedMaterial;

                        material.addEventListener( 'dispose', onMaterialDispose );


                    }


                    result = cachedMaterial;


                }


            }


            result.visible = material.visible;

            result.wireframe = material.wireframe;


            if ( type === VSMShadowMap ) {


                result.side = ( material.shadowSide !== null ) ? material.shadowSide : material.side;


            } else {


                result.side = ( material.shadowSide !== null ) ? material.shadowSide : shadowSide[ material.side ];


            }


            result.alphaMap = material.alphaMap;

            result.alphaTest = material.alphaTest;

            result.map = material.map;


            result.clipShadows = material.clipShadows;

            result.clippingPlanes = material.clippingPlanes;

            result.clipIntersection = material.clipIntersection;


            result.displacementMap = material.displacementMap;

            result.displacementScale = material.displacementScale;

            result.displacementBias = material.displacementBias;


            result.wireframeLinewidth = material.wireframeLinewidth;

            result.linewidth = material.linewidth;


            if ( light.isPointLight === true && result.isMeshDistanceMaterial === true ) {


                const materialProperties = _renderer.properties.get( result );

                materialProperties.light = light;


            }


            return result;


        }


        function renderObject( object, camera, shadowCamera, light, type ) {


            if ( object.visible === false ) return;


            const visible = object.layers.test( camera.layers );


            if ( visible && ( object.isMesh || object.isLine || object.isPoints ) ) {


                if ( ( object.castShadow || ( object.receiveShadow && type === VSMShadowMap ) ) && ( ! object.frustumCulled || _frustum.intersectsObject( object ) ) ) {


                    object.modelViewMatrix.multiplyMatrices( shadowCamera.matrixWorldInverse, object.matrixWorld );


                    const geometry = _objects.update( object );

                    const material = object.material;


                    if ( Array.isArray( material ) ) {


                        const groups = geometry.groups;


                        for ( let k = 0, kl = groups.length; k < kl; k ++ ) {


                            const group = groups[ k ];

                            const groupMaterial = material[ group.materialIndex ];


                            if ( groupMaterial && groupMaterial.visible ) {


                                const depthMaterial = getDepthMaterial( object, groupMaterial, light, type );


                                object.onBeforeShadow( _renderer, object, camera, shadowCamera, geometry, depthMaterial, group );


                                _renderer.renderBufferDirect( shadowCamera, null, geometry, depthMaterial, object, group );


                                object.onAfterShadow( _renderer, object, camera, shadowCamera, geometry, depthMaterial, group );


                            }


                        }


                    } else if ( material.visible ) {


                        const depthMaterial = getDepthMaterial( object, material, light, type );


                        object.onBeforeShadow( _renderer, object, camera, shadowCamera, geometry, depthMaterial, null );


                        _renderer.renderBufferDirect( shadowCamera, null, geometry, depthMaterial, object, null );


                        object.onAfterShadow( _renderer, object, camera, shadowCamera, geometry, depthMaterial, null );


                    }


                }


            }


            const children = object.children;


            for ( let i = 0, l = children.length; i < l; i ++ ) {


                renderObject( children[ i ], camera, shadowCamera, light, type );


            }


        }


        function onMaterialDispose( event ) {


            const material = event.target;


            material.removeEventListener( 'dispose', onMaterialDispose );


            // make sure to remove the unique distance/depth materials used for shadow map rendering


            for ( const id in _materialCache ) {


                const cache = _materialCache[ id ];


                const uuid = event.target.uuid;


                if ( uuid in cache ) {


                    const shadowMaterial = cache[ uuid ];

                    shadowMaterial.dispose();

                    delete cache[ uuid ];


                }


            }


        }


    }


    function WebGLState( gl, extensions, capabilities ) {


        const isWebGL2 = capabilities.isWebGL2;


        function ColorBuffer() {


            let locked = false;


            const color = new Vector4();

            let currentColorMask = null;

            const currentColorClear = new Vector4( 0, 0, 0, 0 );


            return {


                setMask: function ( colorMask ) {


                    if ( currentColorMask !== colorMask && ! locked ) {


                        gl.colorMask( colorMask, colorMask, colorMask, colorMask );

                        currentColorMask = colorMask;


                    }


                },


                setLocked: function ( lock ) {


                    locked = lock;


                },


                setClear: function ( r, g, b, a, premultipliedAlpha ) {


                    if ( premultipliedAlpha === true ) {


                        r *= a; g *= a; b *= a;


                    }


                    color.set( r, g, b, a );


                    if ( currentColorClear.equals( color ) === false ) {


                        gl.clearColor( r, g, b, a );

                        currentColorClear.copy( color );


                    }


                },


                reset: function () {


                    locked = false;


                    currentColorMask = null;

                    currentColorClear.set( - 1, 0, 0, 0 ); // set to invalid state


                }


            };


        }


        function DepthBuffer() {


            let locked = false;


            let currentDepthMask = null;

            let currentDepthFunc = null;

            let currentDepthClear = null;


            return {


                setTest: function ( depthTest ) {


                    if ( depthTest ) {


                        enable( gl.DEPTH_TEST );


                    } else {


                        disable( gl.DEPTH_TEST );


                    }


                },


                setMask: function ( depthMask ) {


                    if ( currentDepthMask !== depthMask && ! locked ) {


                        gl.depthMask( depthMask );

                        currentDepthMask = depthMask;


                    }


                },


                setFunc: function ( depthFunc ) {


                    if ( currentDepthFunc !== depthFunc ) {


                        switch ( depthFunc ) {


                            case NeverDepth:


                                gl.depthFunc( gl.NEVER );

                                break;


                            case AlwaysDepth:


                                gl.depthFunc( gl.ALWAYS );

                                break;


                            case LessDepth:


                                gl.depthFunc( gl.LESS );

                                break;


                            case LessEqualDepth:


                                gl.depthFunc( gl.LEQUAL );

                                break;


                            case EqualDepth:


                                gl.depthFunc( gl.EQUAL );

                                break;


                            case GreaterEqualDepth:


                                gl.depthFunc( gl.GEQUAL );

                                break;


                            case GreaterDepth:


                                gl.depthFunc( gl.GREATER );

                                break;


                            case NotEqualDepth:


                                gl.depthFunc( gl.NOTEQUAL );

                                break;


                            default:


                                gl.depthFunc( gl.LEQUAL );


                        }


                        currentDepthFunc = depthFunc;


                    }


                },


                setLocked: function ( lock ) {


                    locked = lock;


                },


                setClear: function ( depth ) {


                    if ( currentDepthClear !== depth ) {


                        gl.clearDepth( depth );

                        currentDepthClear = depth;


                    }


                },


                reset: function () {


                    locked = false;


                    currentDepthMask = null;

                    currentDepthFunc = null;

                    currentDepthClear = null;


                }


            };


        }


        function StencilBuffer() {


            let locked = false;


            let currentStencilMask = null;

            let currentStencilFunc = null;

            let currentStencilRef = null;

            let currentStencilFuncMask = null;

            let currentStencilFail = null;

            let currentStencilZFail = null;

            let currentStencilZPass = null;

            let currentStencilClear = null;


            return {


                setTest: function ( stencilTest ) {


                    if ( ! locked ) {


                        if ( stencilTest ) {


                            enable( gl.STENCIL_TEST );


                        } else {


                            disable( gl.STENCIL_TEST );


                        }


                    }


                },


                setMask: function ( stencilMask ) {


                    if ( currentStencilMask !== stencilMask && ! locked ) {


                        gl.stencilMask( stencilMask );

                        currentStencilMask = stencilMask;


                    }


                },


                setFunc: function ( stencilFunc, stencilRef, stencilMask ) {


                    if ( currentStencilFunc !== stencilFunc ||

                         currentStencilRef !== stencilRef ||

                         currentStencilFuncMask !== stencilMask ) {


                        gl.stencilFunc( stencilFunc, stencilRef, stencilMask );


                        currentStencilFunc = stencilFunc;

                        currentStencilRef = stencilRef;

                        currentStencilFuncMask = stencilMask;


                    }


                },


                setOp: function ( stencilFail, stencilZFail, stencilZPass ) {


                    if ( currentStencilFail !== stencilFail ||

                         currentStencilZFail !== stencilZFail ||

                         currentStencilZPass !== stencilZPass ) {


                        gl.stencilOp( stencilFail, stencilZFail, stencilZPass );


                        currentStencilFail = stencilFail;

                        currentStencilZFail = stencilZFail;

                        currentStencilZPass = stencilZPass;


                    }


                },


                setLocked: function ( lock ) {


                    locked = lock;


                },


                setClear: function ( stencil ) {


                    if ( currentStencilClear !== stencil ) {


                        gl.clearStencil( stencil );

                        currentStencilClear = stencil;


                    }


                },


                reset: function () {


                    locked = false;


                    currentStencilMask = null;

                    currentStencilFunc = null;

                    currentStencilRef = null;

                    currentStencilFuncMask = null;

                    currentStencilFail = null;

                    currentStencilZFail = null;

                    currentStencilZPass = null;

                    currentStencilClear = null;


                }


            };


        }


        //


        const colorBuffer = new ColorBuffer();

        const depthBuffer = new DepthBuffer();

        const stencilBuffer = new StencilBuffer();


        const uboBindings = new WeakMap();

        const uboProgramMap = new WeakMap();


        let enabledCapabilities = {};


        let currentBoundFramebuffers = {};

        let currentDrawbuffers = new WeakMap();

        let defaultDrawbuffers = [];


        let currentProgram = null;


        let currentBlendingEnabled = false;

        let currentBlending = null;

        let currentBlendEquation = null;

        let currentBlendSrc = null;

        let currentBlendDst = null;

        let currentBlendEquationAlpha = null;

        let currentBlendSrcAlpha = null;

        let currentBlendDstAlpha = null;

        let currentBlendColor = new Color( 0, 0, 0 );

        let currentBlendAlpha = 0;

        let currentPremultipledAlpha = false;


        let currentFlipSided = null;

        let currentCullFace = null;


        let currentLineWidth = null;


        let currentPolygonOffsetFactor = null;

        let currentPolygonOffsetUnits = null;


        const maxTextures = gl.getParameter( gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS );


        let lineWidthAvailable = false;

        let version = 0;

        const glVersion = gl.getParameter( gl.VERSION );


        if ( glVersion.indexOf( 'WebGL' ) !== - 1 ) {


            version = parseFloat( /^WebGL (\d)/.exec( glVersion )[ 1 ] );

            lineWidthAvailable = ( version >= 1.0 );


        } else if ( glVersion.indexOf( 'OpenGL ES' ) !== - 1 ) {


            version = parseFloat( /^OpenGL ES (\d)/.exec( glVersion )[ 1 ] );

            lineWidthAvailable = ( version >= 2.0 );


        }


        let currentTextureSlot = null;

        let currentBoundTextures = {};


        const scissorParam = gl.getParameter( gl.SCISSOR_BOX );

        const viewportParam = gl.getParameter( gl.VIEWPORT );


        const currentScissor = new Vector4().fromArray( scissorParam );

        const currentViewport = new Vector4().fromArray( viewportParam );


        function createTexture( type, target, count, dimensions ) {


            const data = new Uint8Array( 4 ); // 4 is required to match default unpack alignment of 4.

            const texture = gl.createTexture();


            gl.bindTexture( type, texture );

            gl.texParameteri( type, gl.TEXTURE_MIN_FILTER, gl.NEAREST );

            gl.texParameteri( type, gl.TEXTURE_MAG_FILTER, gl.NEAREST );


            for ( let i = 0; i < count; i ++ ) {


                if ( isWebGL2 && ( type === gl.TEXTURE_3D || type === gl.TEXTURE_2D_ARRAY ) ) {


                    gl.texImage3D( target, 0, gl.RGBA, 1, 1, dimensions, 0, gl.RGBA, gl.UNSIGNED_BYTE, data );


                } else {


                    gl.texImage2D( target + i, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, data );


                }


            }


            return texture;


        }


        const emptyTextures = {};

        emptyTextures[ gl.TEXTURE_2D ] = createTexture( gl.TEXTURE_2D, gl.TEXTURE_2D, 1 );

        emptyTextures[ gl.TEXTURE_CUBE_MAP ] = createTexture( gl.TEXTURE_CUBE_MAP, gl.TEXTURE_CUBE_MAP_POSITIVE_X, 6 );


        if ( isWebGL2 ) {


            emptyTextures[ gl.TEXTURE_2D_ARRAY ] = createTexture( gl.TEXTURE_2D_ARRAY, gl.TEXTURE_2D_ARRAY, 1, 1 );

            emptyTextures[ gl.TEXTURE_3D ] = createTexture( gl.TEXTURE_3D, gl.TEXTURE_3D, 1, 1 );


        }


        // init


        colorBuffer.setClear( 0, 0, 0, 1 );

        depthBuffer.setClear( 1 );

        stencilBuffer.setClear( 0 );


        enable( gl.DEPTH_TEST );

        depthBuffer.setFunc( LessEqualDepth );


        setFlipSided( false );

        setCullFace( CullFaceBack );

        enable( gl.CULL_FACE );


        setBlending( NoBlending );


        //


        function enable( id ) {


            if ( enabledCapabilities[ id ] !== true ) {


                gl.enable( id );

                enabledCapabilities[ id ] = true;


            }


        }


        function disable( id ) {


            if ( enabledCapabilities[ id ] !== false ) {


                gl.disable( id );

                enabledCapabilities[ id ] = false;


            }


        }


        function bindFramebuffer( target, framebuffer ) {


            if ( currentBoundFramebuffers[ target ] !== framebuffer ) {


                gl.bindFramebuffer( target, framebuffer );


                currentBoundFramebuffers[ target ] = framebuffer;


                if ( isWebGL2 ) {


                    // gl.DRAW_FRAMEBUFFER is equivalent to gl.FRAMEBUFFER


                    if ( target === gl.DRAW_FRAMEBUFFER ) {


                        currentBoundFramebuffers[ gl.FRAMEBUFFER ] = framebuffer;


                    }


                    if ( target === gl.FRAMEBUFFER ) {


                        currentBoundFramebuffers[ gl.DRAW_FRAMEBUFFER ] = framebuffer;


                    }


                }


                return true;


            }


            return false;


        }


        function drawBuffers( renderTarget, framebuffer ) {


            let drawBuffers = defaultDrawbuffers;


            let needsUpdate = false;


            if ( renderTarget ) {


                drawBuffers = currentDrawbuffers.get( framebuffer );


                if ( drawBuffers === undefined ) {


                    drawBuffers = [];

                    currentDrawbuffers.set( framebuffer, drawBuffers );


                }


                if ( renderTarget.isWebGLMultipleRenderTargets ) {


                    const textures = renderTarget.texture;


                    if ( drawBuffers.length !== textures.length || drawBuffers[ 0 ] !== gl.COLOR_ATTACHMENT0 ) {


                        for ( let i = 0, il = textures.length; i < il; i ++ ) {


                            drawBuffers[ i ] = gl.COLOR_ATTACHMENT0 + i;


                        }


                        drawBuffers.length = textures.length;


                        needsUpdate = true;


                    }


                } else {


                    if ( drawBuffers[ 0 ] !== gl.COLOR_ATTACHMENT0 ) {


                        drawBuffers[ 0 ] = gl.COLOR_ATTACHMENT0;


                        needsUpdate = true;


                    }


                }


            } else {


                if ( drawBuffers[ 0 ] !== gl.BACK ) {


                    drawBuffers[ 0 ] = gl.BACK;


                    needsUpdate = true;


                }


            }


            if ( needsUpdate ) {


                if ( capabilities.isWebGL2 ) {


                    gl.drawBuffers( drawBuffers );


                } else {


                    extensions.get( 'WEBGL_draw_buffers' ).drawBuffersWEBGL( drawBuffers );


                }


            }


        }


        function useProgram( program ) {


            if ( currentProgram !== program ) {


                gl.useProgram( program );


                currentProgram = program;


                return true;


            }


            return false;


        }


        const equationToGL = {

            [ AddEquation ]: gl.FUNC_ADD,

            [ SubtractEquation ]: gl.FUNC_SUBTRACT,

            [ ReverseSubtractEquation ]: gl.FUNC_REVERSE_SUBTRACT

        };


        if ( isWebGL2 ) {


            equationToGL[ MinEquation ] = gl.MIN;

            equationToGL[ MaxEquation ] = gl.MAX;


        } else {


            const extension = extensions.get( 'EXT_blend_minmax' );


            if ( extension !== null ) {


                equationToGL[ MinEquation ] = extension.MIN_EXT;

                equationToGL[ MaxEquation ] = extension.MAX_EXT;


            }


        }


        const factorToGL = {

            [ ZeroFactor ]: gl.ZERO,

            [ OneFactor ]: gl.ONE,

            [ SrcColorFactor ]: gl.SRC_COLOR,

            [ SrcAlphaFactor ]: gl.SRC_ALPHA,

            [ SrcAlphaSaturateFactor ]: gl.SRC_ALPHA_SATURATE,

            [ DstColorFactor ]: gl.DST_COLOR,

            [ DstAlphaFactor ]: gl.DST_ALPHA,

            [ OneMinusSrcColorFactor ]: gl.ONE_MINUS_SRC_COLOR,

            [ OneMinusSrcAlphaFactor ]: gl.ONE_MINUS_SRC_ALPHA,

            [ OneMinusDstColorFactor ]: gl.ONE_MINUS_DST_COLOR,

            [ OneMinusDstAlphaFactor ]: gl.ONE_MINUS_DST_ALPHA,

            [ ConstantColorFactor ]: gl.CONSTANT_COLOR,

            [ OneMinusConstantColorFactor ]: gl.ONE_MINUS_CONSTANT_COLOR,

            [ ConstantAlphaFactor ]: gl.CONSTANT_ALPHA,

            [ OneMinusConstantAlphaFactor ]: gl.ONE_MINUS_CONSTANT_ALPHA

        };


        function setBlending( blending, blendEquation, blendSrc, blendDst, blendEquationAlpha, blendSrcAlpha, blendDstAlpha, blendColor, blendAlpha, premultipliedAlpha ) {


            if ( blending === NoBlending ) {


                if ( currentBlendingEnabled === true ) {


                    disable( gl.BLEND );

                    currentBlendingEnabled = false;


                }


                return;


            }


            if ( currentBlendingEnabled === false ) {


                enable( gl.BLEND );

                currentBlendingEnabled = true;


            }


            if ( blending !== CustomBlending ) {


                if ( blending !== currentBlending || premultipliedAlpha !== currentPremultipledAlpha ) {


                    if ( currentBlendEquation !== AddEquation || currentBlendEquationAlpha !== AddEquation ) {


                        gl.blendEquation( gl.FUNC_ADD );


                        currentBlendEquation = AddEquation;

                        currentBlendEquationAlpha = AddEquation;


                    }


                    if ( premultipliedAlpha ) {


                        switch ( blending ) {


                            case NormalBlending:

                                gl.blendFuncSeparate( gl.ONE, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA );

                                break;


                            case AdditiveBlending:

                                gl.blendFunc( gl.ONE, gl.ONE );

                                break;


                            case SubtractiveBlending:

                                gl.blendFuncSeparate( gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ZERO, gl.ONE );

                                break;


                            case MultiplyBlending:

                                gl.blendFuncSeparate( gl.ZERO, gl.SRC_COLOR, gl.ZERO, gl.SRC_ALPHA );

                                break;


                            default:

                                console.error( 'THREE.WebGLState: Invalid blending: ', blending );

                                break;


                        }


                    } else {


                        switch ( blending ) {


                            case NormalBlending:

                                gl.blendFuncSeparate( gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA );

                                break;


                            case AdditiveBlending:

                                gl.blendFunc( gl.SRC_ALPHA, gl.ONE );

                                break;


                            case SubtractiveBlending:

                                gl.blendFuncSeparate( gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ZERO, gl.ONE );

                                break;


                            case MultiplyBlending:

                                gl.blendFunc( gl.ZERO, gl.SRC_COLOR );

                                break;


                            default:

                                console.error( 'THREE.WebGLState: Invalid blending: ', blending );

                                break;


                        }


                    }


                    currentBlendSrc = null;

                    currentBlendDst = null;

                    currentBlendSrcAlpha = null;

                    currentBlendDstAlpha = null;

                    currentBlendColor.set( 0, 0, 0 );

                    currentBlendAlpha = 0;


                    currentBlending = blending;

                    currentPremultipledAlpha = premultipliedAlpha;


                }


                return;


            }


            // custom blending


            blendEquationAlpha = blendEquationAlpha || blendEquation;

            blendSrcAlpha = blendSrcAlpha || blendSrc;

            blendDstAlpha = blendDstAlpha || blendDst;


            if ( blendEquation !== currentBlendEquation || blendEquationAlpha !== currentBlendEquationAlpha ) {


                gl.blendEquationSeparate( equationToGL[ blendEquation ], equationToGL[ blendEquationAlpha ] );


                currentBlendEquation = blendEquation;

                currentBlendEquationAlpha = blendEquationAlpha;


            }


            if ( blendSrc !== currentBlendSrc || blendDst !== currentBlendDst || blendSrcAlpha !== currentBlendSrcAlpha || blendDstAlpha !== currentBlendDstAlpha ) {


                gl.blendFuncSeparate( factorToGL[ blendSrc ], factorToGL[ blendDst ], factorToGL[ blendSrcAlpha ], factorToGL[ blendDstAlpha ] );


                currentBlendSrc = blendSrc;

                currentBlendDst = blendDst;

                currentBlendSrcAlpha = blendSrcAlpha;

                currentBlendDstAlpha = blendDstAlpha;


            }


            if ( blendColor.equals( currentBlendColor ) === false || blendAlpha !== currentBlendAlpha ) {


                gl.blendColor( blendColor.r, blendColor.g, blendColor.b, blendAlpha );


                currentBlendColor.copy( blendColor );

                currentBlendAlpha = blendAlpha;


            }


            currentBlending = blending;

            currentPremultipledAlpha = false;


        }


        function setMaterial( material, frontFaceCW ) {


            material.side === DoubleSide

                ? disable( gl.CULL_FACE )

                : enable( gl.CULL_FACE );


            let flipSided = ( material.side === BackSide );

            if ( frontFaceCW ) flipSided = ! flipSided;


            setFlipSided( flipSided );


            ( material.blending === NormalBlending && material.transparent === false )

                ? setBlending( NoBlending )

                : setBlending( material.blending, material.blendEquation, material.blendSrc, material.blendDst, material.blendEquationAlpha, material.blendSrcAlpha, material.blendDstAlpha, material.blendColor, material.blendAlpha, material.premultipliedAlpha );


            depthBuffer.setFunc( material.depthFunc );

            depthBuffer.setTest( material.depthTest );

            depthBuffer.setMask( material.depthWrite );

            colorBuffer.setMask( material.colorWrite );


            const stencilWrite = material.stencilWrite;

            stencilBuffer.setTest( stencilWrite );

            if ( stencilWrite ) {


                stencilBuffer.setMask( material.stencilWriteMask );

                stencilBuffer.setFunc( material.stencilFunc, material.stencilRef, material.stencilFuncMask );

                stencilBuffer.setOp( material.stencilFail, material.stencilZFail, material.stencilZPass );


            }


            setPolygonOffset( material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits );


            material.alphaToCoverage === true

                ? enable( gl.SAMPLE_ALPHA_TO_COVERAGE )

                : disable( gl.SAMPLE_ALPHA_TO_COVERAGE );


        }


        //


        function setFlipSided( flipSided ) {


            if ( currentFlipSided !== flipSided ) {


                if ( flipSided ) {


                    gl.frontFace( gl.CW );


                } else {


                    gl.frontFace( gl.CCW );


                }


                currentFlipSided = flipSided;


            }


        }


        function setCullFace( cullFace ) {


            if ( cullFace !== CullFaceNone ) {


                enable( gl.CULL_FACE );


                if ( cullFace !== currentCullFace ) {


                    if ( cullFace === CullFaceBack ) {


                        gl.cullFace( gl.BACK );


                    } else if ( cullFace === CullFaceFront ) {


                        gl.cullFace( gl.FRONT );


                    } else {


                        gl.cullFace( gl.FRONT_AND_BACK );


                    }


                }


            } else {


                disable( gl.CULL_FACE );


            }


            currentCullFace = cullFace;


        }


        function setLineWidth( width ) {


            if ( width !== currentLineWidth ) {


                if ( lineWidthAvailable ) gl.lineWidth( width );


                currentLineWidth = width;


            }


        }


        function setPolygonOffset( polygonOffset, factor, units ) {


            if ( polygonOffset ) {


                enable( gl.POLYGON_OFFSET_FILL );


                if ( currentPolygonOffsetFactor !== factor || currentPolygonOffsetUnits !== units ) {


                    gl.polygonOffset( factor, units );


                    currentPolygonOffsetFactor = factor;

                    currentPolygonOffsetUnits = units;


                }


            } else {


                disable( gl.POLYGON_OFFSET_FILL );


            }


        }


        function setScissorTest( scissorTest ) {


            if ( scissorTest ) {


                enable( gl.SCISSOR_TEST );


            } else {


                disable( gl.SCISSOR_TEST );


            }


        }


        // texture


        function activeTexture( webglSlot ) {


            if ( webglSlot === undefined ) webglSlot = gl.TEXTURE0 + maxTextures - 1;


            if ( currentTextureSlot !== webglSlot ) {


                gl.activeTexture( webglSlot );

                currentTextureSlot = webglSlot;


            }


        }


        function bindTexture( webglType, webglTexture, webglSlot ) {


            if ( webglSlot === undefined ) {


                if ( currentTextureSlot === null ) {


                    webglSlot = gl.TEXTURE0 + maxTextures - 1;


                } else {


                    webglSlot = currentTextureSlot;


                }


            }


            let boundTexture = currentBoundTextures[ webglSlot ];


            if ( boundTexture === undefined ) {


                boundTexture = { type: undefined, texture: undefined };

                currentBoundTextures[ webglSlot ] = boundTexture;


            }


            if ( boundTexture.type !== webglType || boundTexture.texture !== webglTexture ) {


                if ( currentTextureSlot !== webglSlot ) {


                    gl.activeTexture( webglSlot );

                    currentTextureSlot = webglSlot;


                }


                gl.bindTexture( webglType, webglTexture || emptyTextures[ webglType ] );


                boundTexture.type = webglType;

                boundTexture.texture = webglTexture;


            }


        }


        function unbindTexture() {


            const boundTexture = currentBoundTextures[ currentTextureSlot ];


            if ( boundTexture !== undefined && boundTexture.type !== undefined ) {


                gl.bindTexture( boundTexture.type, null );


                boundTexture.type = undefined;

                boundTexture.texture = undefined;


            }


        }


        function compressedTexImage2D() {


            try {


                gl.compressedTexImage2D.apply( gl, arguments );


            } catch ( error ) {


                console.error( 'THREE.WebGLState:', error );


            }


        }


        function compressedTexImage3D() {


            try {


                gl.compressedTexImage3D.apply( gl, arguments );


            } catch ( error ) {


                console.error( 'THREE.WebGLState:', error );


            }


        }


        function texSubImage2D() {


            try {


                gl.texSubImage2D.apply( gl, arguments );


            } catch ( error ) {


                console.error( 'THREE.WebGLState:', error );


            }


        }


        function texSubImage3D() {


            try {


                gl.texSubImage3D.apply( gl, arguments );


            } catch ( error ) {


                console.error( 'THREE.WebGLState:', error );


            }


        }


        function compressedTexSubImage2D() {


            try {


                gl.compressedTexSubImage2D.apply( gl, arguments );


            } catch ( error ) {


                console.error( 'THREE.WebGLState:', error );


            }


        }


        function compressedTexSubImage3D() {


            try {


                gl.compressedTexSubImage3D.apply( gl, arguments );


            } catch ( error ) {


                console.error( 'THREE.WebGLState:', error );


            }


        }


        function texStorage2D() {


            try {


                gl.texStorage2D.apply( gl, arguments );


            } catch ( error ) {


                console.error( 'THREE.WebGLState:', error );


            }


        }


        function texStorage3D() {


            try {


                gl.texStorage3D.apply( gl, arguments );


            } catch ( error ) {


                console.error( 'THREE.WebGLState:', error );


            }


        }


        function texImage2D() {


            try {


                gl.texImage2D.apply( gl, arguments );


            } catch ( error ) {


                console.error( 'THREE.WebGLState:', error );


            }


        }


        function texImage3D() {


            try {


                gl.texImage3D.apply( gl, arguments );


            } catch ( error ) {


                console.error( 'THREE.WebGLState:', error );


            }


        }


        //


        function scissor( scissor ) {


            if ( currentScissor.equals( scissor ) === false ) {


                gl.scissor( scissor.x, scissor.y, scissor.z, scissor.w );

                currentScissor.copy( scissor );


            }


        }


        function viewport( viewport ) {


            if ( currentViewport.equals( viewport ) === false ) {


                gl.viewport( viewport.x, viewport.y, viewport.z, viewport.w );

                currentViewport.copy( viewport );


            }


        }


        function updateUBOMapping( uniformsGroup, program ) {


            let mapping = uboProgramMap.get( program );


            if ( mapping === undefined ) {


                mapping = new WeakMap();


                uboProgramMap.set( program, mapping );


            }


            let blockIndex = mapping.get( uniformsGroup );


            if ( blockIndex === undefined ) {


                blockIndex = gl.getUniformBlockIndex( program, uniformsGroup.name );


                mapping.set( uniformsGroup, blockIndex );


            }


        }


        function uniformBlockBinding( uniformsGroup, program ) {


            const mapping = uboProgramMap.get( program );

            const blockIndex = mapping.get( uniformsGroup );


            if ( uboBindings.get( program ) !== blockIndex ) {


                // bind shader specific block index to global block point

                gl.uniformBlockBinding( program, blockIndex, uniformsGroup.__bindingPointIndex );


                uboBindings.set( program, blockIndex );


            }


        }


        //


        function reset() {


            // reset state


            gl.disable( gl.BLEND );

            gl.disable( gl.CULL_FACE );

            gl.disable( gl.DEPTH_TEST );

            gl.disable( gl.POLYGON_OFFSET_FILL );

            gl.disable( gl.SCISSOR_TEST );

            gl.disable( gl.STENCIL_TEST );

            gl.disable( gl.SAMPLE_ALPHA_TO_COVERAGE );


            gl.blendEquation( gl.FUNC_ADD );

            gl.blendFunc( gl.ONE, gl.ZERO );

            gl.blendFuncSeparate( gl.ONE, gl.ZERO, gl.ONE, gl.ZERO );

            gl.blendColor( 0, 0, 0, 0 );


            gl.colorMask( true, true, true, true );

            gl.clearColor( 0, 0, 0, 0 );


            gl.depthMask( true );

            gl.depthFunc( gl.LESS );

            gl.clearDepth( 1 );


            gl.stencilMask( 0xffffffff );

            gl.stencilFunc( gl.ALWAYS, 0, 0xffffffff );

            gl.stencilOp( gl.KEEP, gl.KEEP, gl.KEEP );

            gl.clearStencil( 0 );


            gl.cullFace( gl.BACK );

            gl.frontFace( gl.CCW );


            gl.polygonOffset( 0, 0 );


            gl.activeTexture( gl.TEXTURE0 );


            gl.bindFramebuffer( gl.FRAMEBUFFER, null );


            if ( isWebGL2 === true ) {


                gl.bindFramebuffer( gl.DRAW_FRAMEBUFFER, null );

                gl.bindFramebuffer( gl.READ_FRAMEBUFFER, null );


            }


            gl.useProgram( null );


            gl.lineWidth( 1 );


            gl.scissor( 0, 0, gl.canvas.width, gl.canvas.height );

            gl.viewport( 0, 0, gl.canvas.width, gl.canvas.height );


            // reset internals


            enabledCapabilities = {};


            currentTextureSlot = null;

            currentBoundTextures = {};


            currentBoundFramebuffers = {};

            currentDrawbuffers = new WeakMap();

            defaultDrawbuffers = [];


            currentProgram = null;


            currentBlendingEnabled = false;

            currentBlending = null;

            currentBlendEquation = null;

            currentBlendSrc = null;

            currentBlendDst = null;

            currentBlendEquationAlpha = null;

            currentBlendSrcAlpha = null;

            currentBlendDstAlpha = null;

            currentBlendColor = new Color( 0, 0, 0 );

            currentBlendAlpha = 0;

            currentPremultipledAlpha = false;


            currentFlipSided = null;

            currentCullFace = null;


            currentLineWidth = null;


            currentPolygonOffsetFactor = null;

            currentPolygonOffsetUnits = null;


            currentScissor.set( 0, 0, gl.canvas.width, gl.canvas.height );

            currentViewport.set( 0, 0, gl.canvas.width, gl.canvas.height );


            colorBuffer.reset();

            depthBuffer.reset();

            stencilBuffer.reset();


        }


        return {


            buffers: {

                color: colorBuffer,

                depth: depthBuffer,

                stencil: stencilBuffer

            },


            enable: enable,

            disable: disable,


            bindFramebuffer: bindFramebuffer,

            drawBuffers: drawBuffers,


            useProgram: useProgram,


            setBlending: setBlending,

            setMaterial: setMaterial,


            setFlipSided: setFlipSided,

            setCullFace: setCullFace,


            setLineWidth: setLineWidth,

            setPolygonOffset: setPolygonOffset,


            setScissorTest: setScissorTest,


            activeTexture: activeTexture,

            bindTexture: bindTexture,

            unbindTexture: unbindTexture,

            compressedTexImage2D: compressedTexImage2D,

            compressedTexImage3D: compressedTexImage3D,

            texImage2D: texImage2D,

            texImage3D: texImage3D,


            updateUBOMapping: updateUBOMapping,

            uniformBlockBinding: uniformBlockBinding,


            texStorage2D: texStorage2D,

            texStorage3D: texStorage3D,

            texSubImage2D: texSubImage2D,

            texSubImage3D: texSubImage3D,

            compressedTexSubImage2D: compressedTexSubImage2D,

            compressedTexSubImage3D: compressedTexSubImage3D,


            scissor: scissor,

            viewport: viewport,


            reset: reset


        };


    }


    function WebGLTextures( _gl, extensions, state, properties, capabilities, utils, info ) {


        const isWebGL2 = capabilities.isWebGL2;

        const multisampledRTTExt = extensions.has( 'WEBGL_multisampled_render_to_texture' ) ? extensions.get( 'WEBGL_multisampled_render_to_texture' ) : null;

        const supportsInvalidateFramebuffer = typeof navigator === 'undefined' ? false : /OculusBrowser/g.test( navigator.userAgent );


        const _videoTextures = new WeakMap();

        let _canvas;


        const _sources = new WeakMap(); // maps WebglTexture objects to instances of Source


        // cordova iOS (as of 5.0) still uses UIWebView, which provides OffscreenCanvas,

        // also OffscreenCanvas.getContext("webgl"), but not OffscreenCanvas.getContext("2d")!

        // Some implementations may only implement OffscreenCanvas partially (e.g. lacking 2d).


        let useOffscreenCanvas = false;


        try {


            useOffscreenCanvas = typeof OffscreenCanvas !== 'undefined'

                // eslint-disable-next-line compat/compat

                && ( new OffscreenCanvas( 1, 1 ).getContext( '2d' ) ) !== null;


        } catch ( err ) {


            // Ignore any errors


        }


        function createCanvas( width, height ) {


            // Use OffscreenCanvas when available. Specially needed in web workers


            return useOffscreenCanvas ?

                // eslint-disable-next-line compat/compat

                new OffscreenCanvas( width, height ) : createElementNS( 'canvas' );


        }


        function resizeImage( image, needsPowerOfTwo, needsNewCanvas, maxSize ) {


            let scale = 1;


            // handle case if texture exceeds max size


            if ( image.width > maxSize || image.height > maxSize ) {


                scale = maxSize / Math.max( image.width, image.height );


            }


            // only perform resize if necessary


            if ( scale < 1 || needsPowerOfTwo === true ) {


                // only perform resize for certain image types


                if ( ( typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement ) ||

                    ( typeof HTMLCanvasElement !== 'undefined' && image instanceof HTMLCanvasElement ) ||

                    ( typeof ImageBitmap !== 'undefined' && image instanceof ImageBitmap ) ) {


                    const floor = needsPowerOfTwo ? floorPowerOfTwo : Math.floor;


                    const width = floor( scale * image.width );

                    const height = floor( scale * image.height );


                    if ( _canvas === undefined ) _canvas = createCanvas( width, height );


                    // cube textures can't reuse the same canvas


                    const canvas = needsNewCanvas ? createCanvas( width, height ) : _canvas;


                    canvas.width = width;

                    canvas.height = height;


                    const context = canvas.getContext( '2d' );

                    context.drawImage( image, 0, 0, width, height );


                    console.warn( 'THREE.WebGLRenderer: Texture has been resized from (' + image.width + 'x' + image.height + ') to (' + width + 'x' + height + ').' );


                    return canvas;


                } else {


                    if ( 'data' in image ) {


                        console.warn( 'THREE.WebGLRenderer: Image in DataTexture is too big (' + image.width + 'x' + image.height + ').' );


                    }


                    return image;


                }


            }


            return image;


        }


        function isPowerOfTwo$1( image ) {


            return isPowerOfTwo( image.width ) && isPowerOfTwo( image.height );


        }


        function textureNeedsPowerOfTwo( texture ) {


            if ( isWebGL2 ) return false;


            return ( texture.wrapS !== ClampToEdgeWrapping || texture.wrapT !== ClampToEdgeWrapping ) ||

                ( texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter );


        }


        function textureNeedsGenerateMipmaps( texture, supportsMips ) {


            return texture.generateMipmaps && supportsMips &&

                texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter;


        }


        function generateMipmap( target ) {


            _gl.generateMipmap( target );


        }


        function getInternalFormat( internalFormatName, glFormat, glType, colorSpace, forceLinearTransfer = false ) {


            if ( isWebGL2 === false ) return glFormat;


            if ( internalFormatName !== null ) {


                if ( _gl[ internalFormatName ] !== undefined ) return _gl[ internalFormatName ];


                console.warn( 'THREE.WebGLRenderer: Attempt to use non-existing WebGL internal format \'' + internalFormatName + '\'' );


            }


            let internalFormat = glFormat;


            if ( glFormat === _gl.RED ) {


                if ( glType === _gl.FLOAT ) internalFormat = _gl.R32F;

                if ( glType === _gl.HALF_FLOAT ) internalFormat = _gl.R16F;

                if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.R8;


            }


            if ( glFormat === _gl.RED_INTEGER ) {


                if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.R8UI;

                if ( glType === _gl.UNSIGNED_SHORT ) internalFormat = _gl.R16UI;

                if ( glType === _gl.UNSIGNED_INT ) internalFormat = _gl.R32UI;

                if ( glType === _gl.BYTE ) internalFormat = _gl.R8I;

                if ( glType === _gl.SHORT ) internalFormat = _gl.R16I;

                if ( glType === _gl.INT ) internalFormat = _gl.R32I;


            }


            if ( glFormat === _gl.RG ) {


                if ( glType === _gl.FLOAT ) internalFormat = _gl.RG32F;

                if ( glType === _gl.HALF_FLOAT ) internalFormat = _gl.RG16F;

                if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.RG8;


            }


            if ( glFormat === _gl.RGBA ) {


                const transfer = forceLinearTransfer ? LinearTransfer : ColorManagement.getTransfer( colorSpace );


                if ( glType === _gl.FLOAT ) internalFormat = _gl.RGBA32F;

                if ( glType === _gl.HALF_FLOAT ) internalFormat = _gl.RGBA16F;

                if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = ( transfer === SRGBTransfer ) ? _gl.SRGB8_ALPHA8 : _gl.RGBA8;

                if ( glType === _gl.UNSIGNED_SHORT_4_4_4_4 ) internalFormat = _gl.RGBA4;

                if ( glType === _gl.UNSIGNED_SHORT_5_5_5_1 ) internalFormat = _gl.RGB5_A1;


            }


            if ( internalFormat === _gl.R16F || internalFormat === _gl.R32F ||

                internalFormat === _gl.RG16F || internalFormat === _gl.RG32F ||

                internalFormat === _gl.RGBA16F || internalFormat === _gl.RGBA32F ) {


                extensions.get( 'EXT_color_buffer_float' );


            }


            return internalFormat;


        }


        function getMipLevels( texture, image, supportsMips ) {


            if ( textureNeedsGenerateMipmaps( texture, supportsMips ) === true || ( texture.isFramebufferTexture && texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter ) ) {


                return Math.log2( Math.max( image.width, image.height ) ) + 1;


            } else if ( texture.mipmaps !== undefined && texture.mipmaps.length > 0 ) {


                // user-defined mipmaps


                return texture.mipmaps.length;


            } else if ( texture.isCompressedTexture && Array.isArray( texture.image ) ) {


                return image.mipmaps.length;


            } else {


                // texture without mipmaps (only base level)


                return 1;


            }


        }


        // Fallback filters for non-power-of-2 textures


        function filterFallback( f ) {


            if ( f === NearestFilter || f === NearestMipmapNearestFilter || f === NearestMipmapLinearFilter ) {


                return _gl.NEAREST;


            }


            return _gl.LINEAR;


        }


        //


        function onTextureDispose( event ) {


            const texture = event.target;


            texture.removeEventListener( 'dispose', onTextureDispose );


            deallocateTexture( texture );


            if ( texture.isVideoTexture ) {


                _videoTextures.delete( texture );


            }


        }


        function onRenderTargetDispose( event ) {


            const renderTarget = event.target;


            renderTarget.removeEventListener( 'dispose', onRenderTargetDispose );


            deallocateRenderTarget( renderTarget );


        }


        //


        function deallocateTexture( texture ) {


            const textureProperties = properties.get( texture );


            if ( textureProperties.__webglInit === undefined ) return;


            // check if it's necessary to remove the WebGLTexture object


            const source = texture.source;

            const webglTextures = _sources.get( source );


            if ( webglTextures ) {


                const webglTexture = webglTextures[ textureProperties.__cacheKey ];

                webglTexture.usedTimes --;


                // the WebGLTexture object is not used anymore, remove it


                if ( webglTexture.usedTimes === 0 ) {


                    deleteTexture( texture );


                }


                // remove the weak map entry if no WebGLTexture uses the source anymore


                if ( Object.keys( webglTextures ).length === 0 ) {


                    _sources.delete( source );


                }


            }


            properties.remove( texture );


        }


        function deleteTexture( texture ) {


            const textureProperties = properties.get( texture );

            _gl.deleteTexture( textureProperties.__webglTexture );


            const source = texture.source;

            const webglTextures = _sources.get( source );

            delete webglTextures[ textureProperties.__cacheKey ];


            info.memory.textures --;


        }


        function deallocateRenderTarget( renderTarget ) {


            const texture = renderTarget.texture;


            const renderTargetProperties = properties.get( renderTarget );

            const textureProperties = properties.get( texture );


            if ( textureProperties.__webglTexture !== undefined ) {


                _gl.deleteTexture( textureProperties.__webglTexture );


                info.memory.textures --;


            }


            if ( renderTarget.depthTexture ) {


                renderTarget.depthTexture.dispose();


            }


            if ( renderTarget.isWebGLCubeRenderTarget ) {


                for ( let i = 0; i < 6; i ++ ) {


                    if ( Array.isArray( renderTargetProperties.__webglFramebuffer[ i ] ) ) {


                        for ( let level = 0; level < renderTargetProperties.__webglFramebuffer[ i ].length; level ++ ) _gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer[ i ][ level ] );


                    } else {


                        _gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer[ i ] );


                    }


                    if ( renderTargetProperties.__webglDepthbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer[ i ] );


                }


            } else {


                if ( Array.isArray( renderTargetProperties.__webglFramebuffer ) ) {


                    for ( let level = 0; level < renderTargetProperties.__webglFramebuffer.length; level ++ ) _gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer[ level ] );


                } else {


                    _gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer );


                }


                if ( renderTargetProperties.__webglDepthbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer );

                if ( renderTargetProperties.__webglMultisampledFramebuffer ) _gl.deleteFramebuffer( renderTargetProperties.__webglMultisampledFramebuffer );


                if ( renderTargetProperties.__webglColorRenderbuffer ) {


                    for ( let i = 0; i < renderTargetProperties.__webglColorRenderbuffer.length; i ++ ) {


                        if ( renderTargetProperties.__webglColorRenderbuffer[ i ] ) _gl.deleteRenderbuffer( renderTargetProperties.__webglColorRenderbuffer[ i ] );


                    }


                }


                if ( renderTargetProperties.__webglDepthRenderbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthRenderbuffer );


            }


            if ( renderTarget.isWebGLMultipleRenderTargets ) {


                for ( let i = 0, il = texture.length; i < il; i ++ ) {


                    const attachmentProperties = properties.get( texture[ i ] );


                    if ( attachmentProperties.__webglTexture ) {


                        _gl.deleteTexture( attachmentProperties.__webglTexture );


                        info.memory.textures --;


                    }


                    properties.remove( texture[ i ] );


                }


            }


            properties.remove( texture );

            properties.remove( renderTarget );


        }


        //


        let textureUnits = 0;


        function resetTextureUnits() {


            textureUnits = 0;


        }


        function allocateTextureUnit() {


            const textureUnit = textureUnits;


            if ( textureUnit >= capabilities.maxTextures ) {


                console.warn( 'THREE.WebGLTextures: Trying to use ' + textureUnit + ' texture units while this GPU supports only ' + capabilities.maxTextures );


            }


            textureUnits += 1;


            return textureUnit;


        }


        function getTextureCacheKey( texture ) {


            const array = [];


            array.push( texture.wrapS );

            array.push( texture.wrapT );

            array.push( texture.wrapR || 0 );

            array.push( texture.magFilter );

            array.push( texture.minFilter );

            array.push( texture.anisotropy );

            array.push( texture.internalFormat );

            array.push( texture.format );

            array.push( texture.type );

            array.push( texture.generateMipmaps );

            array.push( texture.premultiplyAlpha );

            array.push( texture.flipY );

            array.push( texture.unpackAlignment );

            array.push( texture.colorSpace );


            return array.join();


        }


        //


        function setTexture2D( texture, slot ) {


            const textureProperties = properties.get( texture );


            if ( texture.isVideoTexture ) updateVideoTexture( texture );


            if ( texture.isRenderTargetTexture === false && texture.version > 0 && textureProperties.__version !== texture.version ) {


                const image = texture.image;


                if ( image === null ) {


                    console.warn( 'THREE.WebGLRenderer: Texture marked for update but no image data found.' );


                } else if ( image.complete === false ) {


                    console.warn( 'THREE.WebGLRenderer: Texture marked for update but image is incomplete' );


                } else {


                    uploadTexture( textureProperties, texture, slot );

                    return;


                }


            }


            state.bindTexture( _gl.TEXTURE_2D, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );


        }


        function setTexture2DArray( texture, slot ) {


            const textureProperties = properties.get( texture );


            if ( texture.version > 0 && textureProperties.__version !== texture.version ) {


                uploadTexture( textureProperties, texture, slot );

                return;


            }


            state.bindTexture( _gl.TEXTURE_2D_ARRAY, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );


        }


        function setTexture3D( texture, slot ) {


            const textureProperties = properties.get( texture );


            if ( texture.version > 0 && textureProperties.__version !== texture.version ) {


                uploadTexture( textureProperties, texture, slot );

                return;


            }


            state.bindTexture( _gl.TEXTURE_3D, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );


        }


        function setTextureCube( texture, slot ) {


            const textureProperties = properties.get( texture );


            if ( texture.version > 0 && textureProperties.__version !== texture.version ) {


                uploadCubeTexture( textureProperties, texture, slot );

                return;


            }


            state.bindTexture( _gl.TEXTURE_CUBE_MAP, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );


        }


        const wrappingToGL = {

            [ RepeatWrapping ]: _gl.REPEAT,

            [ ClampToEdgeWrapping ]: _gl.CLAMP_TO_EDGE,

            [ MirroredRepeatWrapping ]: _gl.MIRRORED_REPEAT

        };


        const filterToGL = {

            [ NearestFilter ]: _gl.NEAREST,

            [ NearestMipmapNearestFilter ]: _gl.NEAREST_MIPMAP_NEAREST,

            [ NearestMipmapLinearFilter ]: _gl.NEAREST_MIPMAP_LINEAR,


            [ LinearFilter ]: _gl.LINEAR,

            [ LinearMipmapNearestFilter ]: _gl.LINEAR_MIPMAP_NEAREST,

            [ LinearMipmapLinearFilter ]: _gl.LINEAR_MIPMAP_LINEAR

        };


        const compareToGL = {

            [ NeverCompare ]: _gl.NEVER,

            [ AlwaysCompare ]: _gl.ALWAYS,

            [ LessCompare ]: _gl.LESS,

            [ LessEqualCompare ]: _gl.LEQUAL,

            [ EqualCompare ]: _gl.EQUAL,

            [ GreaterEqualCompare ]: _gl.GEQUAL,

            [ GreaterCompare ]: _gl.GREATER,

            [ NotEqualCompare ]: _gl.NOTEQUAL

        };


        function setTextureParameters( textureType, texture, supportsMips ) {


            if ( supportsMips ) {


                _gl.texParameteri( textureType, _gl.TEXTURE_WRAP_S, wrappingToGL[ texture.wrapS ] );

                _gl.texParameteri( textureType, _gl.TEXTURE_WRAP_T, wrappingToGL[ texture.wrapT ] );


                if ( textureType === _gl.TEXTURE_3D || textureType === _gl.TEXTURE_2D_ARRAY ) {


                    _gl.texParameteri( textureType, _gl.TEXTURE_WRAP_R, wrappingToGL[ texture.wrapR ] );


                }


                _gl.texParameteri( textureType, _gl.TEXTURE_MAG_FILTER, filterToGL[ texture.magFilter ] );

                _gl.texParameteri( textureType, _gl.TEXTURE_MIN_FILTER, filterToGL[ texture.minFilter ] );


            } else {


                _gl.texParameteri( textureType, _gl.TEXTURE_WRAP_S, _gl.CLAMP_TO_EDGE );

                _gl.texParameteri( textureType, _gl.TEXTURE_WRAP_T, _gl.CLAMP_TO_EDGE );


                if ( textureType === _gl.TEXTURE_3D || textureType === _gl.TEXTURE_2D_ARRAY ) {


                    _gl.texParameteri( textureType, _gl.TEXTURE_WRAP_R, _gl.CLAMP_TO_EDGE );


                }


                if ( texture.wrapS !== ClampToEdgeWrapping || texture.wrapT !== ClampToEdgeWrapping ) {


                    console.warn( 'THREE.WebGLRenderer: Texture is not power of two. Texture.wrapS and Texture.wrapT should be set to THREE.ClampToEdgeWrapping.' );


                }


                _gl.texParameteri( textureType, _gl.TEXTURE_MAG_FILTER, filterFallback( texture.magFilter ) );

                _gl.texParameteri( textureType, _gl.TEXTURE_MIN_FILTER, filterFallback( texture.minFilter ) );


                if ( texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter ) {


                    console.warn( 'THREE.WebGLRenderer: Texture is not power of two. Texture.minFilter should be set to THREE.NearestFilter or THREE.LinearFilter.' );


                }


            }


            if ( texture.compareFunction ) {


                _gl.texParameteri( textureType, _gl.TEXTURE_COMPARE_MODE, _gl.COMPARE_REF_TO_TEXTURE );

                _gl.texParameteri( textureType, _gl.TEXTURE_COMPARE_FUNC, compareToGL[ texture.compareFunction ] );


            }


            if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {


                const extension = extensions.get( 'EXT_texture_filter_anisotropic' );


                if ( texture.magFilter === NearestFilter ) return;

                if ( texture.minFilter !== NearestMipmapLinearFilter && texture.minFilter !== LinearMipmapLinearFilter ) return;

                if ( texture.type === FloatType && extensions.has( 'OES_texture_float_linear' ) === false ) return; // verify extension for WebGL 1 and WebGL 2

                if ( isWebGL2 === false && ( texture.type === HalfFloatType && extensions.has( 'OES_texture_half_float_linear' ) === false ) ) return; // verify extension for WebGL 1 only


                if ( texture.anisotropy > 1 || properties.get( texture ).__currentAnisotropy ) {


                    _gl.texParameterf( textureType, extension.TEXTURE_MAX_ANISOTROPY_EXT, Math.min( texture.anisotropy, capabilities.getMaxAnisotropy() ) );

                    properties.get( texture ).__currentAnisotropy = texture.anisotropy;


                }


            }


        }


        function initTexture( textureProperties, texture ) {


            let forceUpload = false;


            if ( textureProperties.__webglInit === undefined ) {


                textureProperties.__webglInit = true;


                texture.addEventListener( 'dispose', onTextureDispose );


            }


            // create Source <-> WebGLTextures mapping if necessary


            const source = texture.source;

            let webglTextures = _sources.get( source );


            if ( webglTextures === undefined ) {


                webglTextures = {};

                _sources.set( source, webglTextures );


            }


            // check if there is already a WebGLTexture object for the given texture parameters


            const textureCacheKey = getTextureCacheKey( texture );


            if ( textureCacheKey !== textureProperties.__cacheKey ) {


                // if not, create a new instance of WebGLTexture


                if ( webglTextures[ textureCacheKey ] === undefined ) {


                    // create new entry


                    webglTextures[ textureCacheKey ] = {

                        texture: _gl.createTexture(),

                        usedTimes: 0

                    };


                    info.memory.textures ++;


                    // when a new instance of WebGLTexture was created, a texture upload is required

                    // even if the image contents are identical


                    forceUpload = true;


                }


                webglTextures[ textureCacheKey ].usedTimes ++;


                // every time the texture cache key changes, it's necessary to check if an instance of

                // WebGLTexture can be deleted in order to avoid a memory leak.


                const webglTexture = webglTextures[ textureProperties.__cacheKey ];


                if ( webglTexture !== undefined ) {


                    webglTextures[ textureProperties.__cacheKey ].usedTimes --;


                    if ( webglTexture.usedTimes === 0 ) {


                        deleteTexture( texture );


                    }


                }


                // store references to cache key and WebGLTexture object


                textureProperties.__cacheKey = textureCacheKey;

                textureProperties.__webglTexture = webglTextures[ textureCacheKey ].texture;


            }


            return forceUpload;


        }


        function uploadTexture( textureProperties, texture, slot ) {


            let textureType = _gl.TEXTURE_2D;


            if ( texture.isDataArrayTexture || texture.isCompressedArrayTexture ) textureType = _gl.TEXTURE_2D_ARRAY;

            if ( texture.isData3DTexture ) textureType = _gl.TEXTURE_3D;


            const forceUpload = initTexture( textureProperties, texture );

            const source = texture.source;


            state.bindTexture( textureType, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );


            const sourceProperties = properties.get( source );


            if ( source.version !== sourceProperties.__version || forceUpload === true ) {


                state.activeTexture( _gl.TEXTURE0 + slot );


                const workingPrimaries = ColorManagement.getPrimaries( ColorManagement.workingColorSpace );

                const texturePrimaries = texture.colorSpace === NoColorSpace ? null : ColorManagement.getPrimaries( texture.colorSpace );

                const unpackConversion = texture.colorSpace === NoColorSpace || workingPrimaries === texturePrimaries ? _gl.NONE : _gl.BROWSER_DEFAULT_WEBGL;


                _gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, texture.flipY );

                _gl.pixelStorei( _gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultiplyAlpha );

                _gl.pixelStorei( _gl.UNPACK_ALIGNMENT, texture.unpackAlignment );

                _gl.pixelStorei( _gl.UNPACK_COLORSPACE_CONVERSION_WEBGL, unpackConversion );


                const needsPowerOfTwo = textureNeedsPowerOfTwo( texture ) && isPowerOfTwo$1( texture.image ) === false;

                let image = resizeImage( texture.image, needsPowerOfTwo, false, capabilities.maxTextureSize );

                image = verifyColorSpace( texture, image );


                const supportsMips = isPowerOfTwo$1( image ) || isWebGL2,

                    glFormat = utils.convert( texture.format, texture.colorSpace );


                let glType = utils.convert( texture.type ),

                    glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace, texture.isVideoTexture );


                setTextureParameters( textureType, texture, supportsMips );


                let mipmap;

                const mipmaps = texture.mipmaps;


                const useTexStorage = ( isWebGL2 && texture.isVideoTexture !== true && glInternalFormat !== RGB_ETC1_Format );

                const allocateMemory = ( sourceProperties.__version === undefined ) || ( forceUpload === true );

                const levels = getMipLevels( texture, image, supportsMips );


                if ( texture.isDepthTexture ) {


                    // populate depth texture with dummy data


                    glInternalFormat = _gl.DEPTH_COMPONENT;


                    if ( isWebGL2 ) {


                        if ( texture.type === FloatType ) {


                            glInternalFormat = _gl.DEPTH_COMPONENT32F;


                        } else if ( texture.type === UnsignedIntType ) {


                            glInternalFormat = _gl.DEPTH_COMPONENT24;


                        } else if ( texture.type === UnsignedInt248Type ) {


                            glInternalFormat = _gl.DEPTH24_STENCIL8;


                        } else {


                            glInternalFormat = _gl.DEPTH_COMPONENT16; // WebGL2 requires sized internalformat for glTexImage2D


                        }


                    } else {


                        if ( texture.type === FloatType ) {


                            console.error( 'WebGLRenderer: Floating point depth texture requires WebGL2.' );


                        }


                    }


                    // validation checks for WebGL 1


                    if ( texture.format === DepthFormat && glInternalFormat === _gl.DEPTH_COMPONENT ) {


                        // The error INVALID_OPERATION is generated by texImage2D if format and internalformat are

                        // DEPTH_COMPONENT and type is not UNSIGNED_SHORT or UNSIGNED_INT

                        // (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)

                        if ( texture.type !== UnsignedShortType && texture.type !== UnsignedIntType ) {


                            console.warn( 'THREE.WebGLRenderer: Use UnsignedShortType or UnsignedIntType for DepthFormat DepthTexture.' );


                            texture.type = UnsignedIntType;

                            glType = utils.convert( texture.type );


                        }


                    }


                    if ( texture.format === DepthStencilFormat && glInternalFormat === _gl.DEPTH_COMPONENT ) {


                        // Depth stencil textures need the DEPTH_STENCIL internal format

                        // (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)

                        glInternalFormat = _gl.DEPTH_STENCIL;


                        // The error INVALID_OPERATION is generated by texImage2D if format and internalformat are

                        // DEPTH_STENCIL and type is not UNSIGNED_INT_24_8_WEBGL.

                        // (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)

                        if ( texture.type !== UnsignedInt248Type ) {


                            console.warn( 'THREE.WebGLRenderer: Use UnsignedInt248Type for DepthStencilFormat DepthTexture.' );


                            texture.type = UnsignedInt248Type;

                            glType = utils.convert( texture.type );


                        }


                    }


                    //


                    if ( allocateMemory ) {


                        if ( useTexStorage ) {


                            state.texStorage2D( _gl.TEXTURE_2D, 1, glInternalFormat, image.width, image.height );


                        } else {


                            state.texImage2D( _gl.TEXTURE_2D, 0, glInternalFormat, image.width, image.height, 0, glFormat, glType, null );


                        }


                    }


                } else if ( texture.isDataTexture ) {


                    // use manually created mipmaps if available

                    // if there are no manual mipmaps

                    // set 0 level mipmap and then use GL to generate other mipmap levels


                    if ( mipmaps.length > 0 && supportsMips ) {


                        if ( useTexStorage && allocateMemory ) {


                            state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, mipmaps[ 0 ].width, mipmaps[ 0 ].height );


                        }


                        for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {


                            mipmap = mipmaps[ i ];


                            if ( useTexStorage ) {


                                state.texSubImage2D( _gl.TEXTURE_2D, i, 0, 0, mipmap.width, mipmap.height, glFormat, glType, mipmap.data );


                            } else {


                                state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );


                            }


                        }


                        texture.generateMipmaps = false;


                    } else {


                        if ( useTexStorage ) {


                            if ( allocateMemory ) {


                                state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, image.width, image.height );


                            }


                            state.texSubImage2D( _gl.TEXTURE_2D, 0, 0, 0, image.width, image.height, glFormat, glType, image.data );


                        } else {


                            state.texImage2D( _gl.TEXTURE_2D, 0, glInternalFormat, image.width, image.height, 0, glFormat, glType, image.data );


                        }


                    }


                } else if ( texture.isCompressedTexture ) {


                    if ( texture.isCompressedArrayTexture ) {


                        if ( useTexStorage && allocateMemory ) {


                            state.texStorage3D( _gl.TEXTURE_2D_ARRAY, levels, glInternalFormat, mipmaps[ 0 ].width, mipmaps[ 0 ].height, image.depth );


                        }


                        for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {


                            mipmap = mipmaps[ i ];


                            if ( texture.format !== RGBAFormat ) {


                                if ( glFormat !== null ) {


                                    if ( useTexStorage ) {


                                        state.compressedTexSubImage3D( _gl.TEXTURE_2D_ARRAY, i, 0, 0, 0, mipmap.width, mipmap.height, image.depth, glFormat, mipmap.data, 0, 0 );


                                    } else {


                                        state.compressedTexImage3D( _gl.TEXTURE_2D_ARRAY, i, glInternalFormat, mipmap.width, mipmap.height, image.depth, 0, mipmap.data, 0, 0 );


                                    }


                                } else {


                                    console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .uploadTexture()' );


                                }


                            } else {


                                if ( useTexStorage ) {


                                    state.texSubImage3D( _gl.TEXTURE_2D_ARRAY, i, 0, 0, 0, mipmap.width, mipmap.height, image.depth, glFormat, glType, mipmap.data );


                                } else {


                                    state.texImage3D( _gl.TEXTURE_2D_ARRAY, i, glInternalFormat, mipmap.width, mipmap.height, image.depth, 0, glFormat, glType, mipmap.data );


                                }


                            }


                        }


                    } else {


                        if ( useTexStorage && allocateMemory ) {


                            state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, mipmaps[ 0 ].width, mipmaps[ 0 ].height );


                        }


                        for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {


                            mipmap = mipmaps[ i ];


                            if ( texture.format !== RGBAFormat ) {


                                if ( glFormat !== null ) {


                                    if ( useTexStorage ) {


                                        state.compressedTexSubImage2D( _gl.TEXTURE_2D, i, 0, 0, mipmap.width, mipmap.height, glFormat, mipmap.data );


                                    } else {


                                        state.compressedTexImage2D( _gl.TEXTURE_2D, i, glInternalFormat, mipmap.width, mipmap.height, 0, mipmap.data );


                                    }


                                } else {


                                    console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .uploadTexture()' );


                                }


                            } else {


                                if ( useTexStorage ) {


                                    state.texSubImage2D( _gl.TEXTURE_2D, i, 0, 0, mipmap.width, mipmap.height, glFormat, glType, mipmap.data );


                                } else {


                                    state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );


                                }


                            }


                        }


                    }


                } else if ( texture.isDataArrayTexture ) {


                    if ( useTexStorage ) {


                        if ( allocateMemory ) {


                            state.texStorage3D( _gl.TEXTURE_2D_ARRAY, levels, glInternalFormat, image.width, image.height, image.depth );


                        }


                        state.texSubImage3D( _gl.TEXTURE_2D_ARRAY, 0, 0, 0, 0, image.width, image.height, image.depth, glFormat, glType, image.data );


                    } else {


                        state.texImage3D( _gl.TEXTURE_2D_ARRAY, 0, glInternalFormat, image.width, image.height, image.depth, 0, glFormat, glType, image.data );


                    }


                } else if ( texture.isData3DTexture ) {


                    if ( useTexStorage ) {


                        if ( allocateMemory ) {


                            state.texStorage3D( _gl.TEXTURE_3D, levels, glInternalFormat, image.width, image.height, image.depth );


                        }


                        state.texSubImage3D( _gl.TEXTURE_3D, 0, 0, 0, 0, image.width, image.height, image.depth, glFormat, glType, image.data );


                    } else {


                        state.texImage3D( _gl.TEXTURE_3D, 0, glInternalFormat, image.width, image.height, image.depth, 0, glFormat, glType, image.data );


                    }


                } else if ( texture.isFramebufferTexture ) {


                    if ( allocateMemory ) {


                        if ( useTexStorage ) {


                            state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, image.width, image.height );


                        } else {


                            let width = image.width, height = image.height;


                            for ( let i = 0; i < levels; i ++ ) {


                                state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, width, height, 0, glFormat, glType, null );


                                width >>= 1;

                                height >>= 1;


                            }


                        }


                    }


                } else {


                    // regular Texture (image, video, canvas)


                    // use manually created mipmaps if available

                    // if there are no manual mipmaps

                    // set 0 level mipmap and then use GL to generate other mipmap levels


                    if ( mipmaps.length > 0 && supportsMips ) {


                        if ( useTexStorage && allocateMemory ) {


                            state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, mipmaps[ 0 ].width, mipmaps[ 0 ].height );


                        }


                        for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {


                            mipmap = mipmaps[ i ];


                            if ( useTexStorage ) {


                                state.texSubImage2D( _gl.TEXTURE_2D, i, 0, 0, glFormat, glType, mipmap );


                            } else {


                                state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, glFormat, glType, mipmap );


                            }


                        }


                        texture.generateMipmaps = false;


                    } else {


                        if ( useTexStorage ) {


                            if ( allocateMemory ) {


                                state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, image.width, image.height );


                            }


                            state.texSubImage2D( _gl.TEXTURE_2D, 0, 0, 0, glFormat, glType, image );


                        } else {


                            state.texImage2D( _gl.TEXTURE_2D, 0, glInternalFormat, glFormat, glType, image );


                        }


                    }


                }


                if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {


                    generateMipmap( textureType );


                }


                sourceProperties.__version = source.version;


                if ( texture.onUpdate ) texture.onUpdate( texture );


            }


            textureProperties.__version = texture.version;


        }


        function uploadCubeTexture( textureProperties, texture, slot ) {


            if ( texture.image.length !== 6 ) return;


            const forceUpload = initTexture( textureProperties, texture );

            const source = texture.source;


            state.bindTexture( _gl.TEXTURE_CUBE_MAP, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );


            const sourceProperties = properties.get( source );


            if ( source.version !== sourceProperties.__version || forceUpload === true ) {


                state.activeTexture( _gl.TEXTURE0 + slot );


                const workingPrimaries = ColorManagement.getPrimaries( ColorManagement.workingColorSpace );

                const texturePrimaries = texture.colorSpace === NoColorSpace ? null : ColorManagement.getPrimaries( texture.colorSpace );

                const unpackConversion = texture.colorSpace === NoColorSpace || workingPrimaries === texturePrimaries ? _gl.NONE : _gl.BROWSER_DEFAULT_WEBGL;


                _gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, texture.flipY );

                _gl.pixelStorei( _gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultiplyAlpha );

                _gl.pixelStorei( _gl.UNPACK_ALIGNMENT, texture.unpackAlignment );

                _gl.pixelStorei( _gl.UNPACK_COLORSPACE_CONVERSION_WEBGL, unpackConversion );


                const isCompressed = ( texture.isCompressedTexture || texture.image[ 0 ].isCompressedTexture );

                const isDataTexture = ( texture.image[ 0 ] && texture.image[ 0 ].isDataTexture );


                const cubeImage = [];


                for ( let i = 0; i < 6; i ++ ) {


                    if ( ! isCompressed && ! isDataTexture ) {


                        cubeImage[ i ] = resizeImage( texture.image[ i ], false, true, capabilities.maxCubemapSize );


                    } else {


                        cubeImage[ i ] = isDataTexture ? texture.image[ i ].image : texture.image[ i ];


                    }


                    cubeImage[ i ] = verifyColorSpace( texture, cubeImage[ i ] );


                }


                const image = cubeImage[ 0 ],

                    supportsMips = isPowerOfTwo$1( image ) || isWebGL2,

                    glFormat = utils.convert( texture.format, texture.colorSpace ),

                    glType = utils.convert( texture.type ),

                    glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace );


                const useTexStorage = ( isWebGL2 && texture.isVideoTexture !== true );

                const allocateMemory = ( sourceProperties.__version === undefined ) || ( forceUpload === true );

                let levels = getMipLevels( texture, image, supportsMips );


                setTextureParameters( _gl.TEXTURE_CUBE_MAP, texture, supportsMips );


                let mipmaps;


                if ( isCompressed ) {


                    if ( useTexStorage && allocateMemory ) {


                        state.texStorage2D( _gl.TEXTURE_CUBE_MAP, levels, glInternalFormat, image.width, image.height );


                    }


                    for ( let i = 0; i < 6; i ++ ) {


                        mipmaps = cubeImage[ i ].mipmaps;


                        for ( let j = 0; j < mipmaps.length; j ++ ) {


                            const mipmap = mipmaps[ j ];


                            if ( texture.format !== RGBAFormat ) {


                                if ( glFormat !== null ) {


                                    if ( useTexStorage ) {


                                        state.compressedTexSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, 0, 0, mipmap.width, mipmap.height, glFormat, mipmap.data );


                                    } else {


                                        state.compressedTexImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, glInternalFormat, mipmap.width, mipmap.height, 0, mipmap.data );


                                    }


                                } else {


                                    console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .setTextureCube()' );


                                }


                            } else {


                                if ( useTexStorage ) {


                                    state.texSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, 0, 0, mipmap.width, mipmap.height, glFormat, glType, mipmap.data );


                                } else {


                                    state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );


                                }


                            }


                        }


                    }


                } else {


                    mipmaps = texture.mipmaps;


                    if ( useTexStorage && allocateMemory ) {


                        // TODO: Uniformly handle mipmap definitions

                        // Normal textures and compressed cube textures define base level + mips with their mipmap array

                        // Uncompressed cube textures use their mipmap array only for mips (no base level)


                        if ( mipmaps.length > 0 ) levels ++;


                        state.texStorage2D( _gl.TEXTURE_CUBE_MAP, levels, glInternalFormat, cubeImage[ 0 ].width, cubeImage[ 0 ].height );


                    }


                    for ( let i = 0; i < 6; i ++ ) {


                        if ( isDataTexture ) {


                            if ( useTexStorage ) {


                                state.texSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 0, 0, cubeImage[ i ].width, cubeImage[ i ].height, glFormat, glType, cubeImage[ i ].data );


                            } else {


                                state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, glInternalFormat, cubeImage[ i ].width, cubeImage[ i ].height, 0, glFormat, glType, cubeImage[ i ].data );


                            }


                            for ( let j = 0; j < mipmaps.length; j ++ ) {


                                const mipmap = mipmaps[ j ];

                                const mipmapImage = mipmap.image[ i ].image;


                                if ( useTexStorage ) {


                                    state.texSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j + 1, 0, 0, mipmapImage.width, mipmapImage.height, glFormat, glType, mipmapImage.data );


                                } else {


                                    state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j + 1, glInternalFormat, mipmapImage.width, mipmapImage.height, 0, glFormat, glType, mipmapImage.data );


                                }


                            }


                        } else {


                            if ( useTexStorage ) {


                                state.texSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 0, 0, glFormat, glType, cubeImage[ i ] );


                            } else {


                                state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, glInternalFormat, glFormat, glType, cubeImage[ i ] );


                            }


                            for ( let j = 0; j < mipmaps.length; j ++ ) {


                                const mipmap = mipmaps[ j ];


                                if ( useTexStorage ) {


                                    state.texSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j + 1, 0, 0, glFormat, glType, mipmap.image[ i ] );


                                } else {


                                    state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j + 1, glInternalFormat, glFormat, glType, mipmap.image[ i ] );


                                }


                            }


                        }


                    }


                }


                if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {


                    // We assume images for cube map have the same size.

                    generateMipmap( _gl.TEXTURE_CUBE_MAP );


                }


                sourceProperties.__version = source.version;


                if ( texture.onUpdate ) texture.onUpdate( texture );


            }


            textureProperties.__version = texture.version;


        }


        // Render targets


        // Setup storage for target texture and bind it to correct framebuffer

        function setupFrameBufferTexture( framebuffer, renderTarget, texture, attachment, textureTarget, level ) {


            const glFormat = utils.convert( texture.format, texture.colorSpace );

            const glType = utils.convert( texture.type );

            const glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace );

            const renderTargetProperties = properties.get( renderTarget );


            if ( ! renderTargetProperties.__hasExternalTextures ) {


                const width = Math.max( 1, renderTarget.width >> level );

                const height = Math.max( 1, renderTarget.height >> level );


                if ( textureTarget === _gl.TEXTURE_3D || textureTarget === _gl.TEXTURE_2D_ARRAY ) {


                    state.texImage3D( textureTarget, level, glInternalFormat, width, height, renderTarget.depth, 0, glFormat, glType, null );


                } else {


                    state.texImage2D( textureTarget, level, glInternalFormat, width, height, 0, glFormat, glType, null );


                }


            }


            state.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );


            if ( useMultisampledRTT( renderTarget ) ) {


                multisampledRTTExt.framebufferTexture2DMultisampleEXT( _gl.FRAMEBUFFER, attachment, textureTarget, properties.get( texture ).__webglTexture, 0, getRenderTargetSamples( renderTarget ) );


            } else if ( textureTarget === _gl.TEXTURE_2D || ( textureTarget >= _gl.TEXTURE_CUBE_MAP_POSITIVE_X && textureTarget <= _gl.TEXTURE_CUBE_MAP_NEGATIVE_Z ) ) { // see #24753


                _gl.framebufferTexture2D( _gl.FRAMEBUFFER, attachment, textureTarget, properties.get( texture ).__webglTexture, level );


            }


            state.bindFramebuffer( _gl.FRAMEBUFFER, null );


        }


        // Setup storage for internal depth/stencil buffers and bind to correct framebuffer

        function setupRenderBufferStorage( renderbuffer, renderTarget, isMultisample ) {


            _gl.bindRenderbuffer( _gl.RENDERBUFFER, renderbuffer );


            if ( renderTarget.depthBuffer && ! renderTarget.stencilBuffer ) {


                let glInternalFormat = ( isWebGL2 === true ) ? _gl.DEPTH_COMPONENT24 : _gl.DEPTH_COMPONENT16;


                if ( isMultisample || useMultisampledRTT( renderTarget ) ) {


                    const depthTexture = renderTarget.depthTexture;


                    if ( depthTexture && depthTexture.isDepthTexture ) {


                        if ( depthTexture.type === FloatType ) {


                            glInternalFormat = _gl.DEPTH_COMPONENT32F;


                        } else if ( depthTexture.type === UnsignedIntType ) {


                            glInternalFormat = _gl.DEPTH_COMPONENT24;


                        }


                    }


                    const samples = getRenderTargetSamples( renderTarget );


                    if ( useMultisampledRTT( renderTarget ) ) {


                        multisampledRTTExt.renderbufferStorageMultisampleEXT( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );


                    } else {


                        _gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );


                    }


                } else {


                    _gl.renderbufferStorage( _gl.RENDERBUFFER, glInternalFormat, renderTarget.width, renderTarget.height );


                }


                _gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.DEPTH_ATTACHMENT, _gl.RENDERBUFFER, renderbuffer );


            } else if ( renderTarget.depthBuffer && renderTarget.stencilBuffer ) {


                const samples = getRenderTargetSamples( renderTarget );


                if ( isMultisample && useMultisampledRTT( renderTarget ) === false ) {


                    _gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, _gl.DEPTH24_STENCIL8, renderTarget.width, renderTarget.height );


                } else if ( useMultisampledRTT( renderTarget ) ) {


                    multisampledRTTExt.renderbufferStorageMultisampleEXT( _gl.RENDERBUFFER, samples, _gl.DEPTH24_STENCIL8, renderTarget.width, renderTarget.height );


                } else {


                    _gl.renderbufferStorage( _gl.RENDERBUFFER, _gl.DEPTH_STENCIL, renderTarget.width, renderTarget.height );


                }


                _gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.DEPTH_STENCIL_ATTACHMENT, _gl.RENDERBUFFER, renderbuffer );


            } else {


                const textures = renderTarget.isWebGLMultipleRenderTargets === true ? renderTarget.texture : [ renderTarget.texture ];


                for ( let i = 0; i < textures.length; i ++ ) {


                    const texture = textures[ i ];


                    const glFormat = utils.convert( texture.format, texture.colorSpace );

                    const glType = utils.convert( texture.type );

                    const glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace );

                    const samples = getRenderTargetSamples( renderTarget );


                    if ( isMultisample && useMultisampledRTT( renderTarget ) === false ) {


                        _gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );


                    } else if ( useMultisampledRTT( renderTarget ) ) {


                        multisampledRTTExt.renderbufferStorageMultisampleEXT( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );


                    } else {


                        _gl.renderbufferStorage( _gl.RENDERBUFFER, glInternalFormat, renderTarget.width, renderTarget.height );


                    }


                }


            }


            _gl.bindRenderbuffer( _gl.RENDERBUFFER, null );


        }


        // Setup resources for a Depth Texture for a FBO (needs an extension)

        function setupDepthTexture( framebuffer, renderTarget ) {


            const isCube = ( renderTarget && renderTarget.isWebGLCubeRenderTarget );

            if ( isCube ) throw new Error( 'Depth Texture with cube render targets is not supported' );


            state.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );


            if ( ! ( renderTarget.depthTexture && renderTarget.depthTexture.isDepthTexture ) ) {


                throw new Error( 'renderTarget.depthTexture must be an instance of THREE.DepthTexture' );


            }


            // upload an empty depth texture with framebuffer size

            if ( ! properties.get( renderTarget.depthTexture ).__webglTexture ||

                    renderTarget.depthTexture.image.width !== renderTarget.width ||

                    renderTarget.depthTexture.image.height !== renderTarget.height ) {


                renderTarget.depthTexture.image.width = renderTarget.width;

                renderTarget.depthTexture.image.height = renderTarget.height;

                renderTarget.depthTexture.needsUpdate = true;


            }


            setTexture2D( renderTarget.depthTexture, 0 );


            const webglDepthTexture = properties.get( renderTarget.depthTexture ).__webglTexture;

            const samples = getRenderTargetSamples( renderTarget );


            if ( renderTarget.depthTexture.format === DepthFormat ) {


                if ( useMultisampledRTT( renderTarget ) ) {


                    multisampledRTTExt.framebufferTexture2DMultisampleEXT( _gl.FRAMEBUFFER, _gl.DEPTH_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0, samples );


                } else {


                    _gl.framebufferTexture2D( _gl.FRAMEBUFFER, _gl.DEPTH_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0 );


                }


            } else if ( renderTarget.depthTexture.format === DepthStencilFormat ) {


                if ( useMultisampledRTT( renderTarget ) ) {


                    multisampledRTTExt.framebufferTexture2DMultisampleEXT( _gl.FRAMEBUFFER, _gl.DEPTH_STENCIL_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0, samples );


                } else {


                    _gl.framebufferTexture2D( _gl.FRAMEBUFFER, _gl.DEPTH_STENCIL_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0 );


                }


            } else {


                throw new Error( 'Unknown depthTexture format' );


            }


        }


        // Setup GL resources for a non-texture depth buffer

        function setupDepthRenderbuffer( renderTarget ) {


            const renderTargetProperties = properties.get( renderTarget );

            const isCube = ( renderTarget.isWebGLCubeRenderTarget === true );


            if ( renderTarget.depthTexture && ! renderTargetProperties.__autoAllocateDepthBuffer ) {


                if ( isCube ) throw new Error( 'target.depthTexture not supported in Cube render targets' );


                setupDepthTexture( renderTargetProperties.__webglFramebuffer, renderTarget );


            } else {


                if ( isCube ) {


                    renderTargetProperties.__webglDepthbuffer = [];


                    for ( let i = 0; i < 6; i ++ ) {


                        state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer[ i ] );

                        renderTargetProperties.__webglDepthbuffer[ i ] = _gl.createRenderbuffer();

                        setupRenderBufferStorage( renderTargetProperties.__webglDepthbuffer[ i ], renderTarget, false );


                    }


                } else {


                    state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer );

                    renderTargetProperties.__webglDepthbuffer = _gl.createRenderbuffer();

                    setupRenderBufferStorage( renderTargetProperties.__webglDepthbuffer, renderTarget, false );


                }


            }


            state.bindFramebuffer( _gl.FRAMEBUFFER, null );


        }


        // rebind framebuffer with external textures

        function rebindTextures( renderTarget, colorTexture, depthTexture ) {


            const renderTargetProperties = properties.get( renderTarget );


            if ( colorTexture !== undefined ) {


                setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer, renderTarget, renderTarget.texture, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_2D, 0 );


            }


            if ( depthTexture !== undefined ) {


                setupDepthRenderbuffer( renderTarget );


            }


        }


        // Set up GL resources for the render target

        function setupRenderTarget( renderTarget ) {


            const texture = renderTarget.texture;


            const renderTargetProperties = properties.get( renderTarget );

            const textureProperties = properties.get( texture );


            renderTarget.addEventListener( 'dispose', onRenderTargetDispose );


            if ( renderTarget.isWebGLMultipleRenderTargets !== true ) {


                if ( textureProperties.__webglTexture === undefined ) {


                    textureProperties.__webglTexture = _gl.createTexture();


                }


                textureProperties.__version = texture.version;

                info.memory.textures ++;


            }


            const isCube = ( renderTarget.isWebGLCubeRenderTarget === true );

            const isMultipleRenderTargets = ( renderTarget.isWebGLMultipleRenderTargets === true );

            const supportsMips = isPowerOfTwo$1( renderTarget ) || isWebGL2;


            // Setup framebuffer


            if ( isCube ) {


                renderTargetProperties.__webglFramebuffer = [];


                for ( let i = 0; i < 6; i ++ ) {


                    if ( isWebGL2 && texture.mipmaps && texture.mipmaps.length > 0 ) {


                        renderTargetProperties.__webglFramebuffer[ i ] = [];


                        for ( let level = 0; level < texture.mipmaps.length; level ++ ) {


                            renderTargetProperties.__webglFramebuffer[ i ][ level ] = _gl.createFramebuffer();


                        }


                    } else {


                        renderTargetProperties.__webglFramebuffer[ i ] = _gl.createFramebuffer();


                    }


                }


            } else {


                if ( isWebGL2 && texture.mipmaps && texture.mipmaps.length > 0 ) {


                    renderTargetProperties.__webglFramebuffer = [];


                    for ( let level = 0; level < texture.mipmaps.length; level ++ ) {


                        renderTargetProperties.__webglFramebuffer[ level ] = _gl.createFramebuffer();


                    }


                } else {


                    renderTargetProperties.__webglFramebuffer = _gl.createFramebuffer();


                }


                if ( isMultipleRenderTargets ) {


                    if ( capabilities.drawBuffers ) {


                        const textures = renderTarget.texture;


                        for ( let i = 0, il = textures.length; i < il; i ++ ) {


                            const attachmentProperties = properties.get( textures[ i ] );


                            if ( attachmentProperties.__webglTexture === undefined ) {


                                attachmentProperties.__webglTexture = _gl.createTexture();


                                info.memory.textures ++;


                            }


                        }


                    } else {


                        console.warn( 'THREE.WebGLRenderer: WebGLMultipleRenderTargets can only be used with WebGL2 or WEBGL_draw_buffers extension.' );


                    }


                }


                if ( ( isWebGL2 && renderTarget.samples > 0 ) && useMultisampledRTT( renderTarget ) === false ) {


                    const textures = isMultipleRenderTargets ? texture : [ texture ];


                    renderTargetProperties.__webglMultisampledFramebuffer = _gl.createFramebuffer();

                    renderTargetProperties.__webglColorRenderbuffer = [];


                    state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );


                    for ( let i = 0; i < textures.length; i ++ ) {


                        const texture = textures[ i ];

                        renderTargetProperties.__webglColorRenderbuffer[ i ] = _gl.createRenderbuffer();


                        _gl.bindRenderbuffer( _gl.RENDERBUFFER, renderTargetProperties.__webglColorRenderbuffer[ i ] );


                        const glFormat = utils.convert( texture.format, texture.colorSpace );

                        const glType = utils.convert( texture.type );

                        const glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace, renderTarget.isXRRenderTarget === true );

                        const samples = getRenderTargetSamples( renderTarget );

                        _gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );


                        _gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0 + i, _gl.RENDERBUFFER, renderTargetProperties.__webglColorRenderbuffer[ i ] );


                    }


                    _gl.bindRenderbuffer( _gl.RENDERBUFFER, null );


                    if ( renderTarget.depthBuffer ) {


                        renderTargetProperties.__webglDepthRenderbuffer = _gl.createRenderbuffer();

                        setupRenderBufferStorage( renderTargetProperties.__webglDepthRenderbuffer, renderTarget, true );


                    }


                    state.bindFramebuffer( _gl.FRAMEBUFFER, null );


                }


            }


            // Setup color buffer


            if ( isCube ) {


                state.bindTexture( _gl.TEXTURE_CUBE_MAP, textureProperties.__webglTexture );

                setTextureParameters( _gl.TEXTURE_CUBE_MAP, texture, supportsMips );


                for ( let i = 0; i < 6; i ++ ) {


                    if ( isWebGL2 && texture.mipmaps && texture.mipmaps.length > 0 ) {


                        for ( let level = 0; level < texture.mipmaps.length; level ++ ) {


                            setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer[ i ][ level ], renderTarget, texture, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, level );


                        }


                    } else {


                        setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer[ i ], renderTarget, texture, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0 );


                    }


                }


                if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {


                    generateMipmap( _gl.TEXTURE_CUBE_MAP );


                }


                state.unbindTexture();


            } else if ( isMultipleRenderTargets ) {


                const textures = renderTarget.texture;


                for ( let i = 0, il = textures.length; i < il; i ++ ) {


                    const attachment = textures[ i ];

                    const attachmentProperties = properties.get( attachment );


                    state.bindTexture( _gl.TEXTURE_2D, attachmentProperties.__webglTexture );

                    setTextureParameters( _gl.TEXTURE_2D, attachment, supportsMips );

                    setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer, renderTarget, attachment, _gl.COLOR_ATTACHMENT0 + i, _gl.TEXTURE_2D, 0 );


                    if ( textureNeedsGenerateMipmaps( attachment, supportsMips ) ) {


                        generateMipmap( _gl.TEXTURE_2D );


                    }


                }


                state.unbindTexture();


            } else {


                let glTextureType = _gl.TEXTURE_2D;


                if ( renderTarget.isWebGL3DRenderTarget || renderTarget.isWebGLArrayRenderTarget ) {


                    if ( isWebGL2 ) {


                        glTextureType = renderTarget.isWebGL3DRenderTarget ? _gl.TEXTURE_3D : _gl.TEXTURE_2D_ARRAY;


                    } else {


                        console.error( 'THREE.WebGLTextures: THREE.Data3DTexture and THREE.DataArrayTexture only supported with WebGL2.' );


                    }


                }


                state.bindTexture( glTextureType, textureProperties.__webglTexture );

                setTextureParameters( glTextureType, texture, supportsMips );


                if ( isWebGL2 && texture.mipmaps && texture.mipmaps.length > 0 ) {


                    for ( let level = 0; level < texture.mipmaps.length; level ++ ) {


                        setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer[ level ], renderTarget, texture, _gl.COLOR_ATTACHMENT0, glTextureType, level );


                    }


                } else {


                    setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer, renderTarget, texture, _gl.COLOR_ATTACHMENT0, glTextureType, 0 );


                }


                if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {


                    generateMipmap( glTextureType );


                }


                state.unbindTexture();


            }


            // Setup depth and stencil buffers


            if ( renderTarget.depthBuffer ) {


                setupDepthRenderbuffer( renderTarget );


            }


        }


        function updateRenderTargetMipmap( renderTarget ) {


            const supportsMips = isPowerOfTwo$1( renderTarget ) || isWebGL2;


            const textures = renderTarget.isWebGLMultipleRenderTargets === true ? renderTarget.texture : [ renderTarget.texture ];


            for ( let i = 0, il = textures.length; i < il; i ++ ) {


                const texture = textures[ i ];


                if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {


                    const target = renderTarget.isWebGLCubeRenderTarget ? _gl.TEXTURE_CUBE_MAP : _gl.TEXTURE_2D;

                    const webglTexture = properties.get( texture ).__webglTexture;


                    state.bindTexture( target, webglTexture );

                    generateMipmap( target );

                    state.unbindTexture();


                }


            }


        }


        function updateMultisampleRenderTarget( renderTarget ) {


            if ( ( isWebGL2 && renderTarget.samples > 0 ) && useMultisampledRTT( renderTarget ) === false ) {


                const textures = renderTarget.isWebGLMultipleRenderTargets ? renderTarget.texture : [ renderTarget.texture ];

                const width = renderTarget.width;

                const height = renderTarget.height;

                let mask = _gl.COLOR_BUFFER_BIT;

                const invalidationArray = [];

                const depthStyle = renderTarget.stencilBuffer ? _gl.DEPTH_STENCIL_ATTACHMENT : _gl.DEPTH_ATTACHMENT;

                const renderTargetProperties = properties.get( renderTarget );

                const isMultipleRenderTargets = ( renderTarget.isWebGLMultipleRenderTargets === true );


                // If MRT we need to remove FBO attachments

                if ( isMultipleRenderTargets ) {


                    for ( let i = 0; i < textures.length; i ++ ) {


                        state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );

                        _gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0 + i, _gl.RENDERBUFFER, null );


                        state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer );

                        _gl.framebufferTexture2D( _gl.DRAW_FRAMEBUFFER, _gl.COLOR_ATTACHMENT0 + i, _gl.TEXTURE_2D, null, 0 );


                    }


                }


                state.bindFramebuffer( _gl.READ_FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );

                state.bindFramebuffer( _gl.DRAW_FRAMEBUFFER, renderTargetProperties.__webglFramebuffer );


                for ( let i = 0; i < textures.length; i ++ ) {


                    invalidationArray.push( _gl.COLOR_ATTACHMENT0 + i );


                    if ( renderTarget.depthBuffer ) {


                        invalidationArray.push( depthStyle );


                    }


                    const ignoreDepthValues = ( renderTargetProperties.__ignoreDepthValues !== undefined ) ? renderTargetProperties.__ignoreDepthValues : false;


                    if ( ignoreDepthValues === false ) {


                        if ( renderTarget.depthBuffer ) mask |= _gl.DEPTH_BUFFER_BIT;

                        if ( renderTarget.stencilBuffer ) mask |= _gl.STENCIL_BUFFER_BIT;


                    }


                    if ( isMultipleRenderTargets ) {


                        _gl.framebufferRenderbuffer( _gl.READ_FRAMEBUFFER, _gl.COLOR_ATTACHMENT0, _gl.RENDERBUFFER, renderTargetProperties.__webglColorRenderbuffer[ i ] );


                    }


                    if ( ignoreDepthValues === true ) {


                        _gl.invalidateFramebuffer( _gl.READ_FRAMEBUFFER, [ depthStyle ] );

                        _gl.invalidateFramebuffer( _gl.DRAW_FRAMEBUFFER, [ depthStyle ] );


                    }


                    if ( isMultipleRenderTargets ) {


                        const webglTexture = properties.get( textures[ i ] ).__webglTexture;

                        _gl.framebufferTexture2D( _gl.DRAW_FRAMEBUFFER, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_2D, webglTexture, 0 );


                    }


                    _gl.blitFramebuffer( 0, 0, width, height, 0, 0, width, height, mask, _gl.NEAREST );


                    if ( supportsInvalidateFramebuffer ) {


                        _gl.invalidateFramebuffer( _gl.READ_FRAMEBUFFER, invalidationArray );


                    }


                }


                state.bindFramebuffer( _gl.READ_FRAMEBUFFER, null );

                state.bindFramebuffer( _gl.DRAW_FRAMEBUFFER, null );


                // If MRT since pre-blit we removed the FBO we need to reconstruct the attachments

                if ( isMultipleRenderTargets ) {


                    for ( let i = 0; i < textures.length; i ++ ) {


                        state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );

                        _gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0 + i, _gl.RENDERBUFFER, renderTargetProperties.__webglColorRenderbuffer[ i ] );


                        const webglTexture = properties.get( textures[ i ] ).__webglTexture;


                        state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer );

                        _gl.framebufferTexture2D( _gl.DRAW_FRAMEBUFFER, _gl.COLOR_ATTACHMENT0 + i, _gl.TEXTURE_2D, webglTexture, 0 );


                    }


                }


                state.bindFramebuffer( _gl.DRAW_FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );


            }


        }


        function getRenderTargetSamples( renderTarget ) {


            return Math.min( capabilities.maxSamples, renderTarget.samples );


        }


        function useMultisampledRTT( renderTarget ) {


            const renderTargetProperties = properties.get( renderTarget );


            return isWebGL2 && renderTarget.samples > 0 && extensions.has( 'WEBGL_multisampled_render_to_texture' ) === true && renderTargetProperties.__useRenderToTexture !== false;


        }


        function updateVideoTexture( texture ) {


            const frame = info.render.frame;


            // Check the last frame we updated the VideoTexture


            if ( _videoTextures.get( texture ) !== frame ) {


                _videoTextures.set( texture, frame );

                texture.update();


            }


        }


        function verifyColorSpace( texture, image ) {


            const colorSpace = texture.colorSpace;

            const format = texture.format;

            const type = texture.type;


            if ( texture.isCompressedTexture === true || texture.isVideoTexture === true || texture.format === _SRGBAFormat ) return image;


            if ( colorSpace !== LinearSRGBColorSpace && colorSpace !== NoColorSpace ) {


                // sRGB


                if ( ColorManagement.getTransfer( colorSpace ) === SRGBTransfer ) {


                    if ( isWebGL2 === false ) {


                        // in WebGL 1, try to use EXT_sRGB extension and unsized formats


                        if ( extensions.has( 'EXT_sRGB' ) === true && format === RGBAFormat ) {


                            texture.format = _SRGBAFormat;


                            // it's not possible to generate mips in WebGL 1 with this extension


                            texture.minFilter = LinearFilter;

                            texture.generateMipmaps = false;


                        } else {


                            // slow fallback (CPU decode)


                            image = ImageUtils.sRGBToLinear( image );


                        }


                    } else {


                        // in WebGL 2 uncompressed textures can only be sRGB encoded if they have the RGBA8 format


                        if ( format !== RGBAFormat || type !== UnsignedByteType ) {


                            console.warn( 'THREE.WebGLTextures: sRGB encoded textures have to use RGBAFormat and UnsignedByteType.' );


                        }


                    }


                } else {


                    console.error( 'THREE.WebGLTextures: Unsupported texture color space:', colorSpace );


                }


            }


            return image;


        }


        //


        this.allocateTextureUnit = allocateTextureUnit;

        this.resetTextureUnits = resetTextureUnits;


        this.setTexture2D = setTexture2D;

        this.setTexture2DArray = setTexture2DArray;

        this.setTexture3D = setTexture3D;

        this.setTextureCube = setTextureCube;

        this.rebindTextures = rebindTextures;

        this.setupRenderTarget = setupRenderTarget;

        this.updateRenderTargetMipmap = updateRenderTargetMipmap;

        this.updateMultisampleRenderTarget = updateMultisampleRenderTarget;

        this.setupDepthRenderbuffer = setupDepthRenderbuffer;

        this.setupFrameBufferTexture = setupFrameBufferTexture;

        this.useMultisampledRTT = useMultisampledRTT;


    }


    function WebGLUtils( gl, extensions, capabilities ) {


        const isWebGL2 = capabilities.isWebGL2;


        function convert( p, colorSpace = NoColorSpace ) {


            let extension;


            const transfer = ColorManagement.getTransfer( colorSpace );


            if ( p === UnsignedByteType ) return gl.UNSIGNED_BYTE;

            if ( p === UnsignedShort4444Type ) return gl.UNSIGNED_SHORT_4_4_4_4;

            if ( p === UnsignedShort5551Type ) return gl.UNSIGNED_SHORT_5_5_5_1;


            if ( p === ByteType ) return gl.BYTE;

            if ( p === ShortType ) return gl.SHORT;

            if ( p === UnsignedShortType ) return gl.UNSIGNED_SHORT;

            if ( p === IntType ) return gl.INT;

            if ( p === UnsignedIntType ) return gl.UNSIGNED_INT;

            if ( p === FloatType ) return gl.FLOAT;


            if ( p === HalfFloatType ) {


                if ( isWebGL2 ) return gl.HALF_FLOAT;


                extension = extensions.get( 'OES_texture_half_float' );


                if ( extension !== null ) {


                    return extension.HALF_FLOAT_OES;


                } else {


                    return null;


                }


            }


            if ( p === AlphaFormat ) return gl.ALPHA;

            if ( p === RGBAFormat ) return gl.RGBA;

            if ( p === LuminanceFormat ) return gl.LUMINANCE;

            if ( p === LuminanceAlphaFormat ) return gl.LUMINANCE_ALPHA;

            if ( p === DepthFormat ) return gl.DEPTH_COMPONENT;

            if ( p === DepthStencilFormat ) return gl.DEPTH_STENCIL;


            // WebGL 1 sRGB fallback


            if ( p === _SRGBAFormat ) {


                extension = extensions.get( 'EXT_sRGB' );


                if ( extension !== null ) {


                    return extension.SRGB_ALPHA_EXT;


                } else {


                    return null;


                }


            }


            // WebGL2 formats.


            if ( p === RedFormat ) return gl.RED;

            if ( p === RedIntegerFormat ) return gl.RED_INTEGER;

            if ( p === RGFormat ) return gl.RG;

            if ( p === RGIntegerFormat ) return gl.RG_INTEGER;

            if ( p === RGBAIntegerFormat ) return gl.RGBA_INTEGER;


            // S3TC


            if ( p === RGB_S3TC_DXT1_Format || p === RGBA_S3TC_DXT1_Format || p === RGBA_S3TC_DXT3_Format || p === RGBA_S3TC_DXT5_Format ) {


                if ( transfer === SRGBTransfer ) {


                    extension = extensions.get( 'WEBGL_compressed_texture_s3tc_srgb' );


                    if ( extension !== null ) {


                        if ( p === RGB_S3TC_DXT1_Format ) return extension.COMPRESSED_SRGB_S3TC_DXT1_EXT;

                        if ( p === RGBA_S3TC_DXT1_Format ) return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;

                        if ( p === RGBA_S3TC_DXT3_Format ) return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;

                        if ( p === RGBA_S3TC_DXT5_Format ) return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;


                    } else {


                        return null;


                    }


                } else {


                    extension = extensions.get( 'WEBGL_compressed_texture_s3tc' );


                    if ( extension !== null ) {


                        if ( p === RGB_S3TC_DXT1_Format ) return extension.COMPRESSED_RGB_S3TC_DXT1_EXT;

                        if ( p === RGBA_S3TC_DXT1_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT1_EXT;

                        if ( p === RGBA_S3TC_DXT3_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT3_EXT;

                        if ( p === RGBA_S3TC_DXT5_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT5_EXT;


                    } else {


                        return null;


                    }


                }


            }


            // PVRTC


            if ( p === RGB_PVRTC_4BPPV1_Format || p === RGB_PVRTC_2BPPV1_Format || p === RGBA_PVRTC_4BPPV1_Format || p === RGBA_PVRTC_2BPPV1_Format ) {


                extension = extensions.get( 'WEBGL_compressed_texture_pvrtc' );


                if ( extension !== null ) {


                    if ( p === RGB_PVRTC_4BPPV1_Format ) return extension.COMPRESSED_RGB_PVRTC_4BPPV1_IMG;

                    if ( p === RGB_PVRTC_2BPPV1_Format ) return extension.COMPRESSED_RGB_PVRTC_2BPPV1_IMG;

                    if ( p === RGBA_PVRTC_4BPPV1_Format ) return extension.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG;

                    if ( p === RGBA_PVRTC_2BPPV1_Format ) return extension.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;


                } else {


                    return null;


                }


            }


            // ETC1


            if ( p === RGB_ETC1_Format ) {


                extension = extensions.get( 'WEBGL_compressed_texture_etc1' );


                if ( extension !== null ) {


                    return extension.COMPRESSED_RGB_ETC1_WEBGL;


                } else {


                    return null;


                }


            }


            // ETC2


            if ( p === RGB_ETC2_Format || p === RGBA_ETC2_EAC_Format ) {


                extension = extensions.get( 'WEBGL_compressed_texture_etc' );


                if ( extension !== null ) {


                    if ( p === RGB_ETC2_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ETC2 : extension.COMPRESSED_RGB8_ETC2;

                    if ( p === RGBA_ETC2_EAC_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC : extension.COMPRESSED_RGBA8_ETC2_EAC;


                } else {


                    return null;


                }


            }


            // ASTC


            if ( p === RGBA_ASTC_4x4_Format || p === RGBA_ASTC_5x4_Format || p === RGBA_ASTC_5x5_Format ||

                p === RGBA_ASTC_6x5_Format || p === RGBA_ASTC_6x6_Format || p === RGBA_ASTC_8x5_Format ||

                p === RGBA_ASTC_8x6_Format || p === RGBA_ASTC_8x8_Format || p === RGBA_ASTC_10x5_Format ||

                p === RGBA_ASTC_10x6_Format || p === RGBA_ASTC_10x8_Format || p === RGBA_ASTC_10x10_Format ||

                p === RGBA_ASTC_12x10_Format || p === RGBA_ASTC_12x12_Format ) {


                extension = extensions.get( 'WEBGL_compressed_texture_astc' );


                if ( extension !== null ) {


                    if ( p === RGBA_ASTC_4x4_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR : extension.COMPRESSED_RGBA_ASTC_4x4_KHR;

                    if ( p === RGBA_ASTC_5x4_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR : extension.COMPRESSED_RGBA_ASTC_5x4_KHR;

                    if ( p === RGBA_ASTC_5x5_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR : extension.COMPRESSED_RGBA_ASTC_5x5_KHR;

                    if ( p === RGBA_ASTC_6x5_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR : extension.COMPRESSED_RGBA_ASTC_6x5_KHR;

                    if ( p === RGBA_ASTC_6x6_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR : extension.COMPRESSED_RGBA_ASTC_6x6_KHR;

                    if ( p === RGBA_ASTC_8x5_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR : extension.COMPRESSED_RGBA_ASTC_8x5_KHR;

                    if ( p === RGBA_ASTC_8x6_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR : extension.COMPRESSED_RGBA_ASTC_8x6_KHR;

                    if ( p === RGBA_ASTC_8x8_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR : extension.COMPRESSED_RGBA_ASTC_8x8_KHR;

                    if ( p === RGBA_ASTC_10x5_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR : extension.COMPRESSED_RGBA_ASTC_10x5_KHR;

                    if ( p === RGBA_ASTC_10x6_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR : extension.COMPRESSED_RGBA_ASTC_10x6_KHR;

                    if ( p === RGBA_ASTC_10x8_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR : extension.COMPRESSED_RGBA_ASTC_10x8_KHR;

                    if ( p === RGBA_ASTC_10x10_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR : extension.COMPRESSED_RGBA_ASTC_10x10_KHR;

                    if ( p === RGBA_ASTC_12x10_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR : extension.COMPRESSED_RGBA_ASTC_12x10_KHR;

                    if ( p === RGBA_ASTC_12x12_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR : extension.COMPRESSED_RGBA_ASTC_12x12_KHR;


                } else {


                    return null;


                }


            }


            // BPTC


            if ( p === RGBA_BPTC_Format || p === RGB_BPTC_SIGNED_Format || p === RGB_BPTC_UNSIGNED_Format ) {


                extension = extensions.get( 'EXT_texture_compression_bptc' );


                if ( extension !== null ) {


                    if ( p === RGBA_BPTC_Format ) return ( transfer === SRGBTransfer ) ? extension.COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT : extension.COMPRESSED_RGBA_BPTC_UNORM_EXT;

                    if ( p === RGB_BPTC_SIGNED_Format ) return extension.COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT;

                    if ( p === RGB_BPTC_UNSIGNED_Format ) return extension.COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT;


                } else {


                    return null;


                }


            }


            // RGTC


            if ( p === RED_RGTC1_Format || p === SIGNED_RED_RGTC1_Format || p === RED_GREEN_RGTC2_Format || p === SIGNED_RED_GREEN_RGTC2_Format ) {


                extension = extensions.get( 'EXT_texture_compression_rgtc' );


                if ( extension !== null ) {


                    if ( p === RGBA_BPTC_Format ) return extension.COMPRESSED_RED_RGTC1_EXT;

                    if ( p === SIGNED_RED_RGTC1_Format ) return extension.COMPRESSED_SIGNED_RED_RGTC1_EXT;

                    if ( p === RED_GREEN_RGTC2_Format ) return extension.COMPRESSED_RED_GREEN_RGTC2_EXT;

                    if ( p === SIGNED_RED_GREEN_RGTC2_Format ) return extension.COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT;


                } else {


                    return null;


                }


            }


            //


            if ( p === UnsignedInt248Type ) {


                if ( isWebGL2 ) return gl.UNSIGNED_INT_24_8;


                extension = extensions.get( 'WEBGL_depth_texture' );


                if ( extension !== null ) {


                    return extension.UNSIGNED_INT_24_8_WEBGL;


                } else {


                    return null;


                }


            }


            // if "p" can't be resolved, assume the user defines a WebGL constant as a string (fallback/workaround for packed RGB formats)


            return ( gl[ p ] !== undefined ) ? gl[ p ] : null;


        }


        return { convert: convert };


    }


    class ArrayCamera extends PerspectiveCamera {


        constructor( array = [] ) {


            super();


            this.isArrayCamera = true;


            this.cameras = array;


        }


    }


    class Group extends Object3D {


        constructor() {


            super();


            this.isGroup = true;


            this.type = 'Group';


        }


    }


    const _moveEvent = { type: 'move' };


    class WebXRController {


        constructor() {


            this._targetRay = null;

            this._grip = null;

            this._hand = null;


        }


        getHandSpace() {


            if ( this._hand === null ) {


                this._hand = new Group();

                this._hand.matrixAutoUpdate = false;

                this._hand.visible = false;


                this._hand.joints = {};

                this._hand.inputState = { pinching: false };


            }


            return this._hand;


        }


        getTargetRaySpace() {


            if ( this._targetRay === null ) {


                this._targetRay = new Group();

                this._targetRay.matrixAutoUpdate = false;

                this._targetRay.visible = false;

                this._targetRay.hasLinearVelocity = false;

                this._targetRay.linearVelocity = new Vector3();

                this._targetRay.hasAngularVelocity = false;

                this._targetRay.angularVelocity = new Vector3();


            }


            return this._targetRay;


        }


        getGripSpace() {


            if ( this._grip === null ) {


                this._grip = new Group();

                this._grip.matrixAutoUpdate = false;

                this._grip.visible = false;

                this._grip.hasLinearVelocity = false;

                this._grip.linearVelocity = new Vector3();

                this._grip.hasAngularVelocity = false;

                this._grip.angularVelocity = new Vector3();


            }


            return this._grip;


        }


        dispatchEvent( event ) {


            if ( this._targetRay !== null ) {


                this._targetRay.dispatchEvent( event );


            }


            if ( this._grip !== null ) {


                this._grip.dispatchEvent( event );


            }


            if ( this._hand !== null ) {


                this._hand.dispatchEvent( event );


            }


            return this;


        }


        connect( inputSource ) {


            if ( inputSource && inputSource.hand ) {


                const hand = this._hand;


                if ( hand ) {


                    for ( const inputjoint of inputSource.hand.values() ) {


                        // Initialize hand with joints when connected

                        this._getHandJoint( hand, inputjoint );


                    }


                }


            }


            this.dispatchEvent( { type: 'connected', data: inputSource } );


            return this;


        }


        disconnect( inputSource ) {


            this.dispatchEvent( { type: 'disconnected', data: inputSource } );


            if ( this._targetRay !== null ) {


                this._targetRay.visible = false;


            }


            if ( this._grip !== null ) {


                this._grip.visible = false;


            }


            if ( this._hand !== null ) {


                this._hand.visible = false;


            }


            return this;


        }


        update( inputSource, frame, referenceSpace ) {


            let inputPose = null;

            let gripPose = null;

            let handPose = null;


            const targetRay = this._targetRay;

            const grip = this._grip;

            const hand = this._hand;


            if ( inputSource && frame.session.visibilityState !== 'visible-blurred' ) {


                if ( hand && inputSource.hand ) {


                    handPose = true;


                    for ( const inputjoint of inputSource.hand.values() ) {


                        // Update the joints groups with the XRJoint poses

                        const jointPose = frame.getJointPose( inputjoint, referenceSpace );


                        // The transform of this joint will be updated with the joint pose on each frame

                        const joint = this._getHandJoint( hand, inputjoint );


                        if ( jointPose !== null ) {


                            joint.matrix.fromArray( jointPose.transform.matrix );

                            joint.matrix.decompose( joint.position, joint.rotation, joint.scale );

                            joint.matrixWorldNeedsUpdate = true;

                            joint.jointRadius = jointPose.radius;


                        }


                        joint.visible = jointPose !== null;


                    }


                    // Custom events


                    // Check pinchz

                    const indexTip = hand.joints[ 'index-finger-tip' ];

                    const thumbTip = hand.joints[ 'thumb-tip' ];

                    const distance = indexTip.position.distanceTo( thumbTip.position );


                    const distanceToPinch = 0.02;

                    const threshold = 0.005;


                    if ( hand.inputState.pinching && distance > distanceToPinch + threshold ) {


                        hand.inputState.pinching = false;

                        this.dispatchEvent( {

                            type: 'pinchend',

                            handedness: inputSource.handedness,

                            target: this

                        } );


                    } else if ( ! hand.inputState.pinching && distance <= distanceToPinch - threshold ) {


                        hand.inputState.pinching = true;

                        this.dispatchEvent( {

                            type: 'pinchstart',

                            handedness: inputSource.handedness,

                            target: this

                        } );


                    }


                } else {


                    if ( grip !== null && inputSource.gripSpace ) {


                        gripPose = frame.getPose( inputSource.gripSpace, referenceSpace );


                        if ( gripPose !== null ) {


                            grip.matrix.fromArray( gripPose.transform.matrix );

                            grip.matrix.decompose( grip.position, grip.rotation, grip.scale );

                            grip.matrixWorldNeedsUpdate = true;


                            if ( gripPose.linearVelocity ) {


                                grip.hasLinearVelocity = true;

                                grip.linearVelocity.copy( gripPose.linearVelocity );


                            } else {


                                grip.hasLinearVelocity = false;


                            }


                            if ( gripPose.angularVelocity ) {


                                grip.hasAngularVelocity = true;

                                grip.angularVelocity.copy( gripPose.angularVelocity );


                            } else {


                                grip.hasAngularVelocity = false;


                            }


                        }


                    }


                }


                if ( targetRay !== null ) {


                    inputPose = frame.getPose( inputSource.targetRaySpace, referenceSpace );


                    // Some runtimes (namely Vive Cosmos with Vive OpenXR Runtime) have only grip space and ray space is equal to it

                    if ( inputPose === null && gripPose !== null ) {


                        inputPose = gripPose;


                    }


                    if ( inputPose !== null ) {


                        targetRay.matrix.fromArray( inputPose.transform.matrix );

                        targetRay.matrix.decompose( targetRay.position, targetRay.rotation, targetRay.scale );

                        targetRay.matrixWorldNeedsUpdate = true;


                        if ( inputPose.linearVelocity ) {


                            targetRay.hasLinearVelocity = true;

                            targetRay.linearVelocity.copy( inputPose.linearVelocity );


                        } else {


                            targetRay.hasLinearVelocity = false;


                        }


                        if ( inputPose.angularVelocity ) {


                            targetRay.hasAngularVelocity = true;

                            targetRay.angularVelocity.copy( inputPose.angularVelocity );


                        } else {


                            targetRay.hasAngularVelocity = false;


                        }


                        this.dispatchEvent( _moveEvent );


                    }


                }


            }


            if ( targetRay !== null ) {


                targetRay.visible = ( inputPose !== null );


            }


            if ( grip !== null ) {


                grip.visible = ( gripPose !== null );


            }


            if ( hand !== null ) {


                hand.visible = ( handPose !== null );


            }


            return this;


        }


        // private method


        _getHandJoint( hand, inputjoint ) {


            if ( hand.joints[ inputjoint.jointName ] === undefined ) {


                const joint = new Group();

                joint.matrixAutoUpdate = false;

                joint.visible = false;

                hand.joints[ inputjoint.jointName ] = joint;


                hand.add( joint );


            }


            return hand.joints[ inputjoint.jointName ];


        }


    }


    class WebXRManager extends EventDispatcher {


        constructor( renderer, gl ) {


            super();


            const scope = this;


            let session = null;


            let framebufferScaleFactor = 1.0;


            let referenceSpace = null;

            let referenceSpaceType = 'local-floor';

            // Set default foveation to maximum.

            let foveation = 1.0;

            let customReferenceSpace = null;


            let pose = null;

            let glBinding = null;

            let glProjLayer = null;

            let glBaseLayer = null;

            let xrFrame = null;

            const attributes = gl.getContextAttributes();

            let initialRenderTarget = null;

            let newRenderTarget = null;


            const controllers = [];

            const controllerInputSources = [];


            const currentSize = new Vector2();

            let currentPixelRatio = null;


            //


            const cameraL = new PerspectiveCamera();

            cameraL.layers.enable( 1 );

            cameraL.viewport = new Vector4();


            const cameraR = new PerspectiveCamera();

            cameraR.layers.enable( 2 );

            cameraR.viewport = new Vector4();


            const cameras = [ cameraL, cameraR ];


            const cameraXR = new ArrayCamera();

            cameraXR.layers.enable( 1 );

            cameraXR.layers.enable( 2 );


            let _currentDepthNear = null;

            let _currentDepthFar = null;


            //


            this.cameraAutoUpdate = true;

            this.enabled = false;


            this.isPresenting = false;


            this.getController = function ( index ) {


                let controller = controllers[ index ];


                if ( controller === undefined ) {


                    controller = new WebXRController();

                    controllers[ index ] = controller;


                }


                return controller.getTargetRaySpace();


            };


            this.getControllerGrip = function ( index ) {


                let controller = controllers[ index ];


                if ( controller === undefined ) {


                    controller = new WebXRController();

                    controllers[ index ] = controller;


                }


                return controller.getGripSpace();


            };


            this.getHand = function ( index ) {


                let controller = controllers[ index ];


                if ( controller === undefined ) {


                    controller = new WebXRController();

                    controllers[ index ] = controller;


                }


                return controller.getHandSpace();


            };


            //


            function onSessionEvent( event ) {


                const controllerIndex = controllerInputSources.indexOf( event.inputSource );


                if ( controllerIndex === - 1 ) {


                    return;


                }


                const controller = controllers[ controllerIndex ];


                if ( controller !== undefined ) {


                    controller.update( event.inputSource, event.frame, customReferenceSpace || referenceSpace );

                    controller.dispatchEvent( { type: event.type, data: event.inputSource } );


                }


            }


            function onSessionEnd() {


                session.removeEventListener( 'select', onSessionEvent );

                session.removeEventListener( 'selectstart', onSessionEvent );

                session.removeEventListener( 'selectend', onSessionEvent );

                session.removeEventListener( 'squeeze', onSessionEvent );

                session.removeEventListener( 'squeezestart', onSessionEvent );

                session.removeEventListener( 'squeezeend', onSessionEvent );

                session.removeEventListener( 'end', onSessionEnd );

                session.removeEventListener( 'inputsourceschange', onInputSourcesChange );


                for ( let i = 0; i < controllers.length; i ++ ) {


                    const inputSource = controllerInputSources[ i ];


                    if ( inputSource === null ) continue;


                    controllerInputSources[ i ] = null;


                    controllers[ i ].disconnect( inputSource );


                }


                _currentDepthNear = null;

                _currentDepthFar = null;


                // restore framebuffer/rendering state


                renderer.setRenderTarget( initialRenderTarget );


                glBaseLayer = null;

                glProjLayer = null;

                glBinding = null;

                session = null;

                newRenderTarget = null;


                //


                animation.stop();


                scope.isPresenting = false;


                renderer.setPixelRatio( currentPixelRatio );

                renderer.setSize( currentSize.width, currentSize.height, false );


                scope.dispatchEvent( { type: 'sessionend' } );


            }


            this.setFramebufferScaleFactor = function ( value ) {


                framebufferScaleFactor = value;


                if ( scope.isPresenting === true ) {


                    console.warn( 'THREE.WebXRManager: Cannot change framebuffer scale while presenting.' );


                }


            };


            this.setReferenceSpaceType = function ( value ) {


                referenceSpaceType = value;


                if ( scope.isPresenting === true ) {


                    console.warn( 'THREE.WebXRManager: Cannot change reference space type while presenting.' );


                }


            };


            this.getReferenceSpace = function () {


                return customReferenceSpace || referenceSpace;


            };


            this.setReferenceSpace = function ( space ) {


                customReferenceSpace = space;


            };


            this.getBaseLayer = function () {


                return glProjLayer !== null ? glProjLayer : glBaseLayer;


            };


            this.getBinding = function () {


                return glBinding;


            };


            this.getFrame = function () {


                return xrFrame;


            };


            this.getSession = function () {


                return session;


            };


            this.setSession = async function ( value ) {


                session = value;


                if ( session !== null ) {


                    initialRenderTarget = renderer.getRenderTarget();


                    session.addEventListener( 'select', onSessionEvent );

                    session.addEventListener( 'selectstart', onSessionEvent );

                    session.addEventListener( 'selectend', onSessionEvent );

                    session.addEventListener( 'squeeze', onSessionEvent );

                    session.addEventListener( 'squeezestart', onSessionEvent );

                    session.addEventListener( 'squeezeend', onSessionEvent );

                    session.addEventListener( 'end', onSessionEnd );

                    session.addEventListener( 'inputsourceschange', onInputSourcesChange );


                    if ( attributes.xrCompatible !== true ) {


                        await gl.makeXRCompatible();


                    }


                    currentPixelRatio = renderer.getPixelRatio();

                    renderer.getSize( currentSize );


                    if ( ( session.renderState.layers === undefined ) || ( renderer.capabilities.isWebGL2 === false ) ) {


                        const layerInit = {

                            antialias: ( session.renderState.layers === undefined ) ? attributes.antialias : true,

                            alpha: true,

                            depth: attributes.depth,

                            stencil: attributes.stencil,

                            framebufferScaleFactor: framebufferScaleFactor

                        };


                        glBaseLayer = new XRWebGLLayer( session, gl, layerInit );


                        session.updateRenderState( { baseLayer: glBaseLayer } );


                        renderer.setPixelRatio( 1 );

                        renderer.setSize( glBaseLayer.framebufferWidth, glBaseLayer.framebufferHeight, false );


                        newRenderTarget = new WebGLRenderTarget(

                            glBaseLayer.framebufferWidth,

                            glBaseLayer.framebufferHeight,

                            {

                                format: RGBAFormat,

                                type: UnsignedByteType,

                                colorSpace: renderer.outputColorSpace,

                                stencilBuffer: attributes.stencil

                            }

                        );


                    } else {


                        let depthFormat = null;

                        let depthType = null;

                        let glDepthFormat = null;


                        if ( attributes.depth ) {


                            glDepthFormat = attributes.stencil ? gl.DEPTH24_STENCIL8 : gl.DEPTH_COMPONENT24;

                            depthFormat = attributes.stencil ? DepthStencilFormat : DepthFormat;

                            depthType = attributes.stencil ? UnsignedInt248Type : UnsignedIntType;


                        }


                        const projectionlayerInit = {

                            colorFormat: gl.RGBA8,

                            depthFormat: glDepthFormat,

                            scaleFactor: framebufferScaleFactor

                        };


                        glBinding = new XRWebGLBinding( session, gl );


                        glProjLayer = glBinding.createProjectionLayer( projectionlayerInit );


                        session.updateRenderState( { layers: [ glProjLayer ] } );


                        renderer.setPixelRatio( 1 );

                        renderer.setSize( glProjLayer.textureWidth, glProjLayer.textureHeight, false );


                        newRenderTarget = new WebGLRenderTarget(

                            glProjLayer.textureWidth,

                            glProjLayer.textureHeight,

                            {

                                format: RGBAFormat,

                                type: UnsignedByteType,

                                depthTexture: new DepthTexture( glProjLayer.textureWidth, glProjLayer.textureHeight, depthType, undefined, undefined, undefined, undefined, undefined, undefined, depthFormat ),

                                stencilBuffer: attributes.stencil,

                                colorSpace: renderer.outputColorSpace,

                                samples: attributes.antialias ? 4 : 0

                            } );


                        const renderTargetProperties = renderer.properties.get( newRenderTarget );

                        renderTargetProperties.__ignoreDepthValues = glProjLayer.ignoreDepthValues;


                    }


                    newRenderTarget.isXRRenderTarget = true; // TODO Remove this when possible, see #23278


                    this.setFoveation( foveation );


                    customReferenceSpace = null;

                    referenceSpace = await session.requestReferenceSpace( referenceSpaceType );


                    animation.setContext( session );

                    animation.start();


                    scope.isPresenting = true;


                    scope.dispatchEvent( { type: 'sessionstart' } );


                }


            };


            this.getEnvironmentBlendMode = function () {


                if ( session !== null ) {


                    return session.environmentBlendMode;


                }


            };


            function onInputSourcesChange( event ) {


                // Notify disconnected


                for ( let i = 0; i < event.removed.length; i ++ ) {


                    const inputSource = event.removed[ i ];

                    const index = controllerInputSources.indexOf( inputSource );


                    if ( index >= 0 ) {


                        controllerInputSources[ index ] = null;

                        controllers[ index ].disconnect( inputSource );


                    }


                }


                // Notify connected


                for ( let i = 0; i < event.added.length; i ++ ) {


                    const inputSource = event.added[ i ];


                    let controllerIndex = controllerInputSources.indexOf( inputSource );


                    if ( controllerIndex === - 1 ) {


                        // Assign input source a controller that currently has no input source


                        for ( let i = 0; i < controllers.length; i ++ ) {


                            if ( i >= controllerInputSources.length ) {


                                controllerInputSources.push( inputSource );

                                controllerIndex = i;

                                break;


                            } else if ( controllerInputSources[ i ] === null ) {


                                controllerInputSources[ i ] = inputSource;

                                controllerIndex = i;

                                break;


                            }


                        }


                        // If all controllers do currently receive input we ignore new ones


                        if ( controllerIndex === - 1 ) break;


                    }


                    const controller = controllers[ controllerIndex ];


                    if ( controller ) {


                        controller.connect( inputSource );


                    }


                }


            }


            //


            const cameraLPos = new Vector3();

            const cameraRPos = new Vector3();


            function setProjectionFromUnion( camera, cameraL, cameraR ) {


                cameraLPos.setFromMatrixPosition( cameraL.matrixWorld );

                cameraRPos.setFromMatrixPosition( cameraR.matrixWorld );


                const ipd = cameraLPos.distanceTo( cameraRPos );


                const projL = cameraL.projectionMatrix.elements;

                const projR = cameraR.projectionMatrix.elements;


                // VR systems will have identical far and near planes, and

                // most likely identical top and bottom frustum extents.

                // Use the left camera for these values.

                const near = projL[ 14 ] / ( projL[ 10 ] - 1 );

                const far = projL[ 14 ] / ( projL[ 10 ] + 1 );

                const topFov = ( projL[ 9 ] + 1 ) / projL[ 5 ];

                const bottomFov = ( projL[ 9 ] - 1 ) / projL[ 5 ];


                const leftFov = ( projL[ 8 ] - 1 ) / projL[ 0 ];

                const rightFov = ( projR[ 8 ] + 1 ) / projR[ 0 ];

                const left = near * leftFov;

                const right = near * rightFov;


                // Calculate the new camera's position offset from the

                // left camera. xOffset should be roughly half `ipd`.

                const zOffset = ipd / ( - leftFov + rightFov );

                const xOffset = zOffset * - leftFov;


                // TODO: Better way to apply this offset?

                cameraL.matrixWorld.decompose( camera.position, camera.quaternion, camera.scale );

                camera.translateX( xOffset );

                camera.translateZ( zOffset );

                camera.matrixWorld.compose( camera.position, camera.quaternion, camera.scale );

                camera.matrixWorldInverse.copy( camera.matrixWorld ).invert();


                // Find the union of the frustum values of the cameras and scale

                // the values so that the near plane's position does not change in world space,

                // although must now be relative to the new union camera.

                const near2 = near + zOffset;

                const far2 = far + zOffset;

                const left2 = left - xOffset;

                const right2 = right + ( ipd - xOffset );

                const top2 = topFov * far / far2 * near2;

                const bottom2 = bottomFov * far / far2 * near2;


                camera.projectionMatrix.makePerspective( left2, right2, top2, bottom2, near2, far2 );

                camera.projectionMatrixInverse.copy( camera.projectionMatrix ).invert();


            }


            function updateCamera( camera, parent ) {


                if ( parent === null ) {


                    camera.matrixWorld.copy( camera.matrix );


                } else {


                    camera.matrixWorld.multiplyMatrices( parent.matrixWorld, camera.matrix );


                }


                camera.matrixWorldInverse.copy( camera.matrixWorld ).invert();


            }


            this.updateCamera = function ( camera ) {


                if ( session === null ) return;


                cameraXR.near = cameraR.near = cameraL.near = camera.near;

                cameraXR.far = cameraR.far = cameraL.far = camera.far;


                if ( _currentDepthNear !== cameraXR.near || _currentDepthFar !== cameraXR.far ) {


                    // Note that the new renderState won't apply until the next frame. See #18320


                    session.updateRenderState( {

                        depthNear: cameraXR.near,

                        depthFar: cameraXR.far

                    } );


                    _currentDepthNear = cameraXR.near;

                    _currentDepthFar = cameraXR.far;


                }


                const parent = camera.parent;

                const cameras = cameraXR.cameras;


                updateCamera( cameraXR, parent );


                for ( let i = 0; i < cameras.length; i ++ ) {


                    updateCamera( cameras[ i ], parent );


                }


                // update projection matrix for proper view frustum culling


                if ( cameras.length === 2 ) {


                    setProjectionFromUnion( cameraXR, cameraL, cameraR );


                } else {


                    // assume single camera setup (AR)


                    cameraXR.projectionMatrix.copy( cameraL.projectionMatrix );


                }


                // update user camera and its children


                updateUserCamera( camera, cameraXR, parent );


            };


            function updateUserCamera( camera, cameraXR, parent ) {


                if ( parent === null ) {


                    camera.matrix.copy( cameraXR.matrixWorld );


                } else {


                    camera.matrix.copy( parent.matrixWorld );

                    camera.matrix.invert();

                    camera.matrix.multiply( cameraXR.matrixWorld );


                }


                camera.matrix.decompose( camera.position, camera.quaternion, camera.scale );

                camera.updateMatrixWorld( true );


                camera.projectionMatrix.copy( cameraXR.projectionMatrix );

                camera.projectionMatrixInverse.copy( cameraXR.projectionMatrixInverse );


                if ( camera.isPerspectiveCamera ) {


                    camera.fov = RAD2DEG * 2 * Math.atan( 1 / camera.projectionMatrix.elements[ 5 ] );

                    camera.zoom = 1;


                }


            }


            this.getCamera = function () {


                return cameraXR;


            };


            this.getFoveation = function () {


                if ( glProjLayer === null && glBaseLayer === null ) {


                    return undefined;


                }


                return foveation;


            };


            this.setFoveation = function ( value ) {


                // 0 = no foveation = full resolution

                // 1 = maximum foveation = the edges render at lower resolution


                foveation = value;


                if ( glProjLayer !== null ) {


                    glProjLayer.fixedFoveation = value;


                }


                if ( glBaseLayer !== null && glBaseLayer.fixedFoveation !== undefined ) {


                    glBaseLayer.fixedFoveation = value;


                }


            };


            // Animation Loop


            let onAnimationFrameCallback = null;


            function onAnimationFrame( time, frame ) {


                pose = frame.getViewerPose( customReferenceSpace || referenceSpace );

                xrFrame = frame;


                if ( pose !== null ) {


                    const views = pose.views;


                    if ( glBaseLayer !== null ) {


                        renderer.setRenderTargetFramebuffer( newRenderTarget, glBaseLayer.framebuffer );

                        renderer.setRenderTarget( newRenderTarget );


                    }


                    let cameraXRNeedsUpdate = false;


                    // check if it's necessary to rebuild cameraXR's camera list


                    if ( views.length !== cameraXR.cameras.length ) {


                        cameraXR.cameras.length = 0;

                        cameraXRNeedsUpdate = true;


                    }


                    for ( let i = 0; i < views.length; i ++ ) {


                        const view = views[ i ];


                        let viewport = null;


                        if ( glBaseLayer !== null ) {


                            viewport = glBaseLayer.getViewport( view );


                        } else {


                            const glSubImage = glBinding.getViewSubImage( glProjLayer, view );

                            viewport = glSubImage.viewport;


                            // For side-by-side projection, we only produce a single texture for both eyes.

                            if ( i === 0 ) {


                                renderer.setRenderTargetTextures(

                                    newRenderTarget,

                                    glSubImage.colorTexture,

                                    glProjLayer.ignoreDepthValues ? undefined : glSubImage.depthStencilTexture );


                                renderer.setRenderTarget( newRenderTarget );


                            }


                        }


                        let camera = cameras[ i ];


                        if ( camera === undefined ) {


                            camera = new PerspectiveCamera();

                            camera.layers.enable( i );

                            camera.viewport = new Vector4();

                            cameras[ i ] = camera;


                        }


                        camera.matrix.fromArray( view.transform.matrix );

                        camera.matrix.decompose( camera.position, camera.quaternion, camera.scale );

                        camera.projectionMatrix.fromArray( view.projectionMatrix );

                        camera.projectionMatrixInverse.copy( camera.projectionMatrix ).invert();

                        camera.viewport.set( viewport.x, viewport.y, viewport.width, viewport.height );


                        if ( i === 0 ) {


                            cameraXR.matrix.copy( camera.matrix );

                            cameraXR.matrix.decompose( cameraXR.position, cameraXR.quaternion, cameraXR.scale );


                        }


                        if ( cameraXRNeedsUpdate === true ) {


                            cameraXR.cameras.push( camera );


                        }


                    }


                }


                //


                for ( let i = 0; i < controllers.length; i ++ ) {


                    const inputSource = controllerInputSources[ i ];

                    const controller = controllers[ i ];


                    if ( inputSource !== null && controller !== undefined ) {


                        controller.update( inputSource, frame, customReferenceSpace || referenceSpace );


                    }


                }


                if ( onAnimationFrameCallback ) onAnimationFrameCallback( time, frame );


                if ( frame.detectedPlanes ) {


                    scope.dispatchEvent( { type: 'planesdetected', data: frame } );


                }


                xrFrame = null;


            }


            const animation = new WebGLAnimation();


            animation.setAnimationLoop( onAnimationFrame );


            this.setAnimationLoop = function ( callback ) {


                onAnimationFrameCallback = callback;


            };


            this.dispose = function () {};


        }


    }


    function WebGLMaterials( renderer, properties ) {


        function refreshTransformUniform( map, uniform ) {


            if ( map.matrixAutoUpdate === true ) {


                map.updateMatrix();


            }


            uniform.value.copy( map.matrix );


        }


        function refreshFogUniforms( uniforms, fog ) {


            fog.color.getRGB( uniforms.fogColor.value, getUnlitUniformColorSpace( renderer ) );


            if ( fog.isFog ) {


                uniforms.fogNear.value = fog.near;

                uniforms.fogFar.value = fog.far;


            } else if ( fog.isFogExp2 ) {


                uniforms.fogDensity.value = fog.density;


            }


        }


        function refreshMaterialUniforms( uniforms, material, pixelRatio, height, transmissionRenderTarget ) {


            if ( material.isMeshBasicMaterial ) {


                refreshUniformsCommon( uniforms, material );


            } else if ( material.isMeshLambertMaterial ) {


                refreshUniformsCommon( uniforms, material );


            } else if ( material.isMeshToonMaterial ) {


                refreshUniformsCommon( uniforms, material );

                refreshUniformsToon( uniforms, material );


            } else if ( material.isMeshPhongMaterial ) {


                refreshUniformsCommon( uniforms, material );

                refreshUniformsPhong( uniforms, material );


            } else if ( material.isMeshStandardMaterial ) {


                refreshUniformsCommon( uniforms, material );

                refreshUniformsStandard( uniforms, material );


                if ( material.isMeshPhysicalMaterial ) {


                    refreshUniformsPhysical( uniforms, material, transmissionRenderTarget );


                }


            } else if ( material.isMeshMatcapMaterial ) {


                refreshUniformsCommon( uniforms, material );

                refreshUniformsMatcap( uniforms, material );


            } else if ( material.isMeshDepthMaterial ) {


                refreshUniformsCommon( uniforms, material );


            } else if ( material.isMeshDistanceMaterial ) {


                refreshUniformsCommon( uniforms, material );

                refreshUniformsDistance( uniforms, material );


            } else if ( material.isMeshNormalMaterial ) {


                refreshUniformsCommon( uniforms, material );


            } else if ( material.isLineBasicMaterial ) {


                refreshUniformsLine( uniforms, material );


                if ( material.isLineDashedMaterial ) {


                    refreshUniformsDash( uniforms, material );


                }


            } else if ( material.isPointsMaterial ) {


                refreshUniformsPoints( uniforms, material, pixelRatio, height );


            } else if ( material.isSpriteMaterial ) {


                refreshUniformsSprites( uniforms, material );


            } else if ( material.isShadowMaterial ) {


                uniforms.color.value.copy( material.color );

                uniforms.opacity.value = material.opacity;


            } else if ( material.isShaderMaterial ) {


                material.uniformsNeedUpdate = false; // #15581


            }


        }


        function refreshUniformsCommon( uniforms, material ) {


            uniforms.opacity.value = material.opacity;


            if ( material.color ) {


                uniforms.diffuse.value.copy( material.color );


            }


            if ( material.emissive ) {


                uniforms.emissive.value.copy( material.emissive ).multiplyScalar( material.emissiveIntensity );


            }


            if ( material.map ) {


                uniforms.map.value = material.map;


                refreshTransformUniform( material.map, uniforms.mapTransform );


            }


            if ( material.alphaMap ) {


                uniforms.alphaMap.value = material.alphaMap;


                refreshTransformUniform( material.alphaMap, uniforms.alphaMapTransform );


            }


            if ( material.bumpMap ) {


                uniforms.bumpMap.value = material.bumpMap;


                refreshTransformUniform( material.bumpMap, uniforms.bumpMapTransform );


                uniforms.bumpScale.value = material.bumpScale;


                if ( material.side === BackSide ) {


                    uniforms.bumpScale.value *= - 1;


                }


            }


            if ( material.normalMap ) {


                uniforms.normalMap.value = material.normalMap;


                refreshTransformUniform( material.normalMap, uniforms.normalMapTransform );


                uniforms.normalScale.value.copy( material.normalScale );


                if ( material.side === BackSide ) {


                    uniforms.normalScale.value.negate();


                }


            }


            if ( material.displacementMap ) {


                uniforms.displacementMap.value = material.displacementMap;


                refreshTransformUniform( material.displacementMap, uniforms.displacementMapTransform );


                uniforms.displacementScale.value = material.displacementScale;

                uniforms.displacementBias.value = material.displacementBias;


            }


            if ( material.emissiveMap ) {


                uniforms.emissiveMap.value = material.emissiveMap;


                refreshTransformUniform( material.emissiveMap, uniforms.emissiveMapTransform );


            }


            if ( material.specularMap ) {


                uniforms.specularMap.value = material.specularMap;


                refreshTransformUniform( material.specularMap, uniforms.specularMapTransform );


            }


            if ( material.alphaTest > 0 ) {


                uniforms.alphaTest.value = material.alphaTest;


            }


            const envMap = properties.get( material ).envMap;


            if ( envMap ) {


                uniforms.envMap.value = envMap;


                uniforms.flipEnvMap.value = ( envMap.isCubeTexture && envMap.isRenderTargetTexture === false ) ? - 1 : 1;


                uniforms.reflectivity.value = material.reflectivity;

                uniforms.ior.value = material.ior;

                uniforms.refractionRatio.value = material.refractionRatio;


            }


            if ( material.lightMap ) {


                uniforms.lightMap.value = material.lightMap;


                // artist-friendly light intensity scaling factor

                const scaleFactor = ( renderer._useLegacyLights === true ) ? Math.PI : 1;


                uniforms.lightMapIntensity.value = material.lightMapIntensity * scaleFactor;


                refreshTransformUniform( material.lightMap, uniforms.lightMapTransform );


            }


            if ( material.aoMap ) {


                uniforms.aoMap.value = material.aoMap;

                uniforms.aoMapIntensity.value = material.aoMapIntensity;


                refreshTransformUniform( material.aoMap, uniforms.aoMapTransform );


            }


        }


        function refreshUniformsLine( uniforms, material ) {


            uniforms.diffuse.value.copy( material.color );

            uniforms.opacity.value = material.opacity;


            if ( material.map ) {


                uniforms.map.value = material.map;


                refreshTransformUniform( material.map, uniforms.mapTransform );


            }


        }


        function refreshUniformsDash( uniforms, material ) {


            uniforms.dashSize.value = material.dashSize;

            uniforms.totalSize.value = material.dashSize + material.gapSize;

            uniforms.scale.value = material.scale;


        }


        function refreshUniformsPoints( uniforms, material, pixelRatio, height ) {


            uniforms.diffuse.value.copy( material.color );

            uniforms.opacity.value = material.opacity;

            uniforms.size.value = material.size * pixelRatio;

            uniforms.scale.value = height * 0.5;


            if ( material.map ) {


                uniforms.map.value = material.map;


                refreshTransformUniform( material.map, uniforms.uvTransform );


            }


            if ( material.alphaMap ) {


                uniforms.alphaMap.value = material.alphaMap;


                refreshTransformUniform( material.alphaMap, uniforms.alphaMapTransform );


            }


            if ( material.alphaTest > 0 ) {


                uniforms.alphaTest.value = material.alphaTest;


            }


        }


        function refreshUniformsSprites( uniforms, material ) {


            uniforms.diffuse.value.copy( material.color );

            uniforms.opacity.value = material.opacity;

            uniforms.rotation.value = material.rotation;


            if ( material.map ) {


                uniforms.map.value = material.map;


                refreshTransformUniform( material.map, uniforms.mapTransform );


            }


            if ( material.alphaMap ) {


                uniforms.alphaMap.value = material.alphaMap;


                refreshTransformUniform( material.alphaMap, uniforms.alphaMapTransform );


            }


            if ( material.alphaTest > 0 ) {


                uniforms.alphaTest.value = material.alphaTest;


            }


        }


        function refreshUniformsPhong( uniforms, material ) {


            uniforms.specular.value.copy( material.specular );

            uniforms.shininess.value = Math.max( material.shininess, 1e-4 ); // to prevent pow( 0.0, 0.0 )


        }


        function refreshUniformsToon( uniforms, material ) {


            if ( material.gradientMap ) {


                uniforms.gradientMap.value = material.gradientMap;


            }


        }


        function refreshUniformsStandard( uniforms, material ) {


            uniforms.metalness.value = material.metalness;


            if ( material.metalnessMap ) {


                uniforms.metalnessMap.value = material.metalnessMap;


                refreshTransformUniform( material.metalnessMap, uniforms.metalnessMapTransform );


            }


            uniforms.roughness.value = material.roughness;


            if ( material.roughnessMap ) {


                uniforms.roughnessMap.value = material.roughnessMap;


                refreshTransformUniform( material.roughnessMap, uniforms.roughnessMapTransform );


            }


            const envMap = properties.get( material ).envMap;


            if ( envMap ) {


                //uniforms.envMap.value = material.envMap; // part of uniforms common

                uniforms.envMapIntensity.value = material.envMapIntensity;


            }


        }


        function refreshUniformsPhysical( uniforms, material, transmissionRenderTarget ) {


            uniforms.ior.value = material.ior; // also part of uniforms common


            if ( material.sheen > 0 ) {


                uniforms.sheenColor.value.copy( material.sheenColor ).multiplyScalar( material.sheen );


                uniforms.sheenRoughness.value = material.sheenRoughness;


                if ( material.sheenColorMap ) {


                    uniforms.sheenColorMap.value = material.sheenColorMap;


                    refreshTransformUniform( material.sheenColorMap, uniforms.sheenColorMapTransform );


                }


                if ( material.sheenRoughnessMap ) {


                    uniforms.sheenRoughnessMap.value = material.sheenRoughnessMap;


                    refreshTransformUniform( material.sheenRoughnessMap, uniforms.sheenRoughnessMapTransform );


                }


            }


            if ( material.clearcoat > 0 ) {


                uniforms.clearcoat.value = material.clearcoat;

                uniforms.clearcoatRoughness.value = material.clearcoatRoughness;


                if ( material.clearcoatMap ) {


                    uniforms.clearcoatMap.value = material.clearcoatMap;


                    refreshTransformUniform( material.clearcoatMap, uniforms.clearcoatMapTransform );


                }


                if ( material.clearcoatRoughnessMap ) {


                    uniforms.clearcoatRoughnessMap.value = material.clearcoatRoughnessMap;


                    refreshTransformUniform( material.clearcoatRoughnessMap, uniforms.clearcoatRoughnessMapTransform );


                }


                if ( material.clearcoatNormalMap ) {


                    uniforms.clearcoatNormalMap.value = material.clearcoatNormalMap;


                    refreshTransformUniform( material.clearcoatNormalMap, uniforms.clearcoatNormalMapTransform );


                    uniforms.clearcoatNormalScale.value.copy( material.clearcoatNormalScale );


                    if ( material.side === BackSide ) {


                        uniforms.clearcoatNormalScale.value.negate();


                    }


                }


            }


            if ( material.iridescence > 0 ) {


                uniforms.iridescence.value = material.iridescence;

                uniforms.iridescenceIOR.value = material.iridescenceIOR;

                uniforms.iridescenceThicknessMinimum.value = material.iridescenceThicknessRange[ 0 ];

                uniforms.iridescenceThicknessMaximum.value = material.iridescenceThicknessRange[ 1 ];


                if ( material.iridescenceMap ) {


                    uniforms.iridescenceMap.value = material.iridescenceMap;


                    refreshTransformUniform( material.iridescenceMap, uniforms.iridescenceMapTransform );


                }


                if ( material.iridescenceThicknessMap ) {


                    uniforms.iridescenceThicknessMap.value = material.iridescenceThicknessMap;


                    refreshTransformUniform( material.iridescenceThicknessMap, uniforms.iridescenceThicknessMapTransform );


                }


            }


            if ( material.transmission > 0 ) {


                uniforms.transmission.value = material.transmission;

                uniforms.transmissionSamplerMap.value = transmissionRenderTarget.texture;

                uniforms.transmissionSamplerSize.value.set( transmissionRenderTarget.width, transmissionRenderTarget.height );


                if ( material.transmissionMap ) {


                    uniforms.transmissionMap.value = material.transmissionMap;


                    refreshTransformUniform( material.transmissionMap, uniforms.transmissionMapTransform );


                }


                uniforms.thickness.value = material.thickness;


                if ( material.thicknessMap ) {


                    uniforms.thicknessMap.value = material.thicknessMap;


                    refreshTransformUniform( material.thicknessMap, uniforms.thicknessMapTransform );


                }


                uniforms.attenuationDistance.value = material.attenuationDistance;

                uniforms.attenuationColor.value.copy( material.attenuationColor );


            }


            if ( material.anisotropy > 0 ) {


                uniforms.anisotropyVector.value.set( material.anisotropy * Math.cos( material.anisotropyRotation ), material.anisotropy * Math.sin( material.anisotropyRotation ) );


                if ( material.anisotropyMap ) {


                    uniforms.anisotropyMap.value = material.anisotropyMap;


                    refreshTransformUniform( material.anisotropyMap, uniforms.anisotropyMapTransform );


                }


            }


            uniforms.specularIntensity.value = material.specularIntensity;

            uniforms.specularColor.value.copy( material.specularColor );


            if ( material.specularColorMap ) {


                uniforms.specularColorMap.value = material.specularColorMap;


                refreshTransformUniform( material.specularColorMap, uniforms.specularColorMapTransform );


            }


            if ( material.specularIntensityMap ) {


                uniforms.specularIntensityMap.value = material.specularIntensityMap;


                refreshTransformUniform( material.specularIntensityMap, uniforms.specularIntensityMapTransform );


            }


        }


        function refreshUniformsMatcap( uniforms, material ) {


            if ( material.matcap ) {


                uniforms.matcap.value = material.matcap;


            }


        }


        function refreshUniformsDistance( uniforms, material ) {


            const light = properties.get( material ).light;


            uniforms.referencePosition.value.setFromMatrixPosition( light.matrixWorld );

            uniforms.nearDistance.value = light.shadow.camera.near;

            uniforms.farDistance.value = light.shadow.camera.far;


        }


        return {

            refreshFogUniforms: refreshFogUniforms,

            refreshMaterialUniforms: refreshMaterialUniforms

        };


    }


    function WebGLUniformsGroups( gl, info, capabilities, state ) {


        let buffers = {};

        let updateList = {};

        let allocatedBindingPoints = [];


        const maxBindingPoints = ( capabilities.isWebGL2 ) ? gl.getParameter( gl.MAX_UNIFORM_BUFFER_BINDINGS ) : 0; // binding points are global whereas block indices are per shader program


        function bind( uniformsGroup, program ) {


            const webglProgram = program.program;

            state.uniformBlockBinding( uniformsGroup, webglProgram );


        }


        function update( uniformsGroup, program ) {


            let buffer = buffers[ uniformsGroup.id ];


            if ( buffer === undefined ) {


                prepareUniformsGroup( uniformsGroup );


                buffer = createBuffer( uniformsGroup );

                buffers[ uniformsGroup.id ] = buffer;


                uniformsGroup.addEventListener( 'dispose', onUniformsGroupsDispose );


            }


            // ensure to update the binding points/block indices mapping for this program


            const webglProgram = program.program;

            state.updateUBOMapping( uniformsGroup, webglProgram );


            // update UBO once per frame


            const frame = info.render.frame;


            if ( updateList[ uniformsGroup.id ] !== frame ) {


                updateBufferData( uniformsGroup );


                updateList[ uniformsGroup.id ] = frame;


            }


        }


        function createBuffer( uniformsGroup ) {


            // the setup of an UBO is independent of a particular shader program but global


            const bindingPointIndex = allocateBindingPointIndex();

            uniformsGroup.__bindingPointIndex = bindingPointIndex;


            const buffer = gl.createBuffer();

            const size = uniformsGroup.__size;

            const usage = uniformsGroup.usage;


            gl.bindBuffer( gl.UNIFORM_BUFFER, buffer );

            gl.bufferData( gl.UNIFORM_BUFFER, size, usage );

            gl.bindBuffer( gl.UNIFORM_BUFFER, null );

            gl.bindBufferBase( gl.UNIFORM_BUFFER, bindingPointIndex, buffer );


            return buffer;


        }


        function allocateBindingPointIndex() {


            for ( let i = 0; i < maxBindingPoints; i ++ ) {


                if ( allocatedBindingPoints.indexOf( i ) === - 1 ) {


                    allocatedBindingPoints.push( i );

                    return i;


                }


            }


            console.error( 'THREE.WebGLRenderer: Maximum number of simultaneously usable uniforms groups reached.' );


            return 0;


        }


        function updateBufferData( uniformsGroup ) {


            const buffer = buffers[ uniformsGroup.id ];

            const uniforms = uniformsGroup.uniforms;

            const cache = uniformsGroup.__cache;


            gl.bindBuffer( gl.UNIFORM_BUFFER, buffer );


            for ( let i = 0, il = uniforms.length; i < il; i ++ ) {


                const uniformArray = Array.isArray( uniforms[ i ] ) ? uniforms[ i ] : [ uniforms[ i ] ];


                for ( let j = 0, jl = uniformArray.length; j < jl; j ++ ) {


                    const uniform = uniformArray[ j ];


                    if ( hasUniformChanged( uniform, i, j, cache ) === true ) {


                        const offset = uniform.__offset;


                        const values = Array.isArray( uniform.value ) ? uniform.value : [ uniform.value ];


                        let arrayOffset = 0;


                        for ( let k = 0; k < values.length; k ++ ) {


                            const value = values[ k ];


                            const info = getUniformSize( value );


                            // TODO add integer and struct support

                            if ( typeof value === 'number' || typeof value === 'boolean' ) {


                                uniform.__data[ 0 ] = value;

                                gl.bufferSubData( gl.UNIFORM_BUFFER, offset + arrayOffset, uniform.__data );


                            } else if ( value.isMatrix3 ) {


                                // manually converting 3x3 to 3x4


                                uniform.__data[ 0 ] = value.elements[ 0 ];

                                uniform.__data[ 1 ] = value.elements[ 1 ];

                                uniform.__data[ 2 ] = value.elements[ 2 ];

                                uniform.__data[ 3 ] = 0;

                                uniform.__data[ 4 ] = value.elements[ 3 ];

                                uniform.__data[ 5 ] = value.elements[ 4 ];

                                uniform.__data[ 6 ] = value.elements[ 5 ];

                                uniform.__data[ 7 ] = 0;

                                uniform.__data[ 8 ] = value.elements[ 6 ];

                                uniform.__data[ 9 ] = value.elements[ 7 ];

                                uniform.__data[ 10 ] = value.elements[ 8 ];

                                uniform.__data[ 11 ] = 0;


                            } else {


                                value.toArray( uniform.__data, arrayOffset );


                                arrayOffset += info.storage / Float32Array.BYTES_PER_ELEMENT;


                            }


                        }


                        gl.bufferSubData( gl.UNIFORM_BUFFER, offset, uniform.__data );


                    }


                }


            }


            gl.bindBuffer( gl.UNIFORM_BUFFER, null );


        }


        function hasUniformChanged( uniform, index, indexArray, cache ) {


            const value = uniform.value;

            const indexString = index + '_' + indexArray;


            if ( cache[ indexString ] === undefined ) {


                // cache entry does not exist so far


                if ( typeof value === 'number' || typeof value === 'boolean' ) {


                    cache[ indexString ] = value;


                } else {


                    cache[ indexString ] = value.clone();


                }


                return true;


            } else {


                const cachedObject = cache[ indexString ];


                // compare current value with cached entry


                if ( typeof value === 'number' || typeof value === 'boolean' ) {


                    if ( cachedObject !== value ) {


                        cache[ indexString ] = value;

                        return true;


                    }


                } else {


                    if ( cachedObject.equals( value ) === false ) {


                        cachedObject.copy( value );

                        return true;


                    }


                }


            }


            return false;


        }


        function prepareUniformsGroup( uniformsGroup ) {


            // determine total buffer size according to the STD140 layout

            // Hint: STD140 is the only supported layout in WebGL 2


            const uniforms = uniformsGroup.uniforms;


            let offset = 0; // global buffer offset in bytes

            const chunkSize = 16; // size of a chunk in bytes


            for ( let i = 0, l = uniforms.length; i < l; i ++ ) {


                const uniformArray = Array.isArray( uniforms[ i ] ) ? uniforms[ i ] : [ uniforms[ i ] ];


                for ( let j = 0, jl = uniformArray.length; j < jl; j ++ ) {


                    const uniform = uniformArray[ j ];


                    const values = Array.isArray( uniform.value ) ? uniform.value : [ uniform.value ];


                    for ( let k = 0, kl = values.length; k < kl; k ++ ) {


                        const value = values[ k ];


                        const info = getUniformSize( value );


                        // Calculate the chunk offset

                        const chunkOffsetUniform = offset % chunkSize;


                        // Check for chunk overflow

                        if ( chunkOffsetUniform !== 0 && ( chunkSize - chunkOffsetUniform ) < info.boundary ) {


                            // Add padding and adjust offset

                            offset += ( chunkSize - chunkOffsetUniform );


                        }


                        // the following two properties will be used for partial buffer updates


                        uniform.__data = new Float32Array( info.storage / Float32Array.BYTES_PER_ELEMENT );

                        uniform.__offset = offset;


                        // Update the global offset

                        offset += info.storage;


                    }


                }


            }


            // ensure correct final padding


            const chunkOffset = offset % chunkSize;


            if ( chunkOffset > 0 ) offset += ( chunkSize - chunkOffset );


            //


            uniformsGroup.__size = offset;

            uniformsGroup.__cache = {};


            return this;


        }


        function getUniformSize( value ) {


            const info = {

                boundary: 0, // bytes

                storage: 0 // bytes

            };


            // determine sizes according to STD140


            if ( typeof value === 'number' || typeof value === 'boolean' ) {


                // float/int/bool


                info.boundary = 4;

                info.storage = 4;


            } else if ( value.isVector2 ) {


                // vec2


                info.boundary = 8;

                info.storage = 8;


            } else if ( value.isVector3 || value.isColor ) {


                // vec3


                info.boundary = 16;

                info.storage = 12; // evil: vec3 must start on a 16-byte boundary but it only consumes 12 bytes


            } else if ( value.isVector4 ) {


                // vec4


                info.boundary = 16;

                info.storage = 16;


            } else if ( value.isMatrix3 ) {


                // mat3 (in STD140 a 3x3 matrix is represented as 3x4)


                info.boundary = 48;

                info.storage = 48;


            } else if ( value.isMatrix4 ) {


                // mat4


                info.boundary = 64;

                info.storage = 64;


            } else if ( value.isTexture ) {


                console.warn( 'THREE.WebGLRenderer: Texture samplers can not be part of an uniforms group.' );


            } else {


                console.warn( 'THREE.WebGLRenderer: Unsupported uniform value type.', value );


            }


            return info;


        }


        function onUniformsGroupsDispose( event ) {


            const uniformsGroup = event.target;


            uniformsGroup.removeEventListener( 'dispose', onUniformsGroupsDispose );


            const index = allocatedBindingPoints.indexOf( uniformsGroup.__bindingPointIndex );

            allocatedBindingPoints.splice( index, 1 );


            gl.deleteBuffer( buffers[ uniformsGroup.id ] );


            delete buffers[ uniformsGroup.id ];

            delete updateList[ uniformsGroup.id ];


        }


        function dispose() {


            for ( const id in buffers ) {


                gl.deleteBuffer( buffers[ id ] );


            }


            allocatedBindingPoints = [];

            buffers = {};

            updateList = {};


        }


        return {


            bind: bind,

            update: update,


            dispose: dispose


        };


    }


    class WebGLRenderer {


        constructor( parameters = {} ) {


            const {

                canvas = createCanvasElement(),

                context = null,

                depth = true,

                stencil = true,

                alpha = false,

                antialias = false,

                premultipliedAlpha = true,

                preserveDrawingBuffer = false,

                powerPreference = 'default',

                failIfMajorPerformanceCaveat = false,

            } = parameters;


            this.isWebGLRenderer = true;


            let _alpha;


            if ( context !== null ) {


                _alpha = context.getContextAttributes().alpha;


            } else {


                _alpha = alpha;


            }


            const uintClearColor = new Uint32Array( 4 );

            const intClearColor = new Int32Array( 4 );


            let currentRenderList = null;

            let currentRenderState = null;


            // render() can be called from within a callback triggered by another render.

            // We track this so that the nested render call gets its list and state isolated from the parent render call.


            const renderListStack = [];

            const renderStateStack = [];


            // public properties


            this.domElement = canvas;


            // Debug configuration container

            this.debug = {


                checkShaderErrors: true,

                onShaderError: null

            };


            // clearing


            this.autoClear = true;

            this.autoClearColor = true;

            this.autoClearDepth = true;

            this.autoClearStencil = true;


            // scene graph


            this.sortObjects = true;


            // user-defined clipping


            this.clippingPlanes = [];

            this.localClippingEnabled = false;


            // physically based shading


            this._outputColorSpace = SRGBColorSpace;


            // physical lights


            this._useLegacyLights = false;


            // tone mapping


            this.toneMapping = NoToneMapping;

            this.toneMappingExposure = 1.0;


            // internal properties


            const _this = this;


            let _isContextLost = false;


            // internal state cache


            let _currentActiveCubeFace = 0;

            let _currentActiveMipmapLevel = 0;

            let _currentRenderTarget = null;

            let _currentMaterialId = - 1;


            let _currentCamera = null;


            const _currentViewport = new Vector4();

            const _currentScissor = new Vector4();

            let _currentScissorTest = null;


            const _currentClearColor = new Color( 0x000000 );

            let _currentClearAlpha = 0;


            //


            let _width = canvas.width;

            let _height = canvas.height;


            let _pixelRatio = 1;

            let _opaqueSort = null;

            let _transparentSort = null;


            const _viewport = new Vector4( 0, 0, _width, _height );

            const _scissor = new Vector4( 0, 0, _width, _height );

            let _scissorTest = false;


            // frustum


            const _frustum = new Frustum();


            // clipping


            let _clippingEnabled = false;

            let _localClippingEnabled = false;


            // transmission


            let _transmissionRenderTarget = null;


            // camera matrices cache


            const _projScreenMatrix = new Matrix4();


            const _vector2 = new Vector2();

            const _vector3 = new Vector3();


            const _emptyScene = { background: null, fog: null, environment: null, overrideMaterial: null, isScene: true };


            function getTargetPixelRatio() {


                return _currentRenderTarget === null ? _pixelRatio : 1;


            }


            // initialize


            let _gl = context;


            function getContext( contextNames, contextAttributes ) {


                for ( let i = 0; i < contextNames.length; i ++ ) {


                    const contextName = contextNames[ i ];

                    const context = canvas.getContext( contextName, contextAttributes );

                    if ( context !== null ) return context;


                }


                return null;


            }


            try {


                const contextAttributes = {

                    alpha: true,

                    depth,

                    stencil,

                    antialias,

                    premultipliedAlpha,

                    preserveDrawingBuffer,

                    powerPreference,

                    failIfMajorPerformanceCaveat,

                };


                // OffscreenCanvas does not have setAttribute, see #22811

                if ( 'setAttribute' in canvas ) canvas.setAttribute( 'data-engine', `three.js r${REVISION}` );


                // event listeners must be registered before WebGL context is created, see #12753

                canvas.addEventListener( 'webglcontextlost', onContextLost, false );

                canvas.addEventListener( 'webglcontextrestored', onContextRestore, false );

                canvas.addEventListener( 'webglcontextcreationerror', onContextCreationError, false );


                if ( _gl === null ) {


                    const contextNames = [ 'webgl2', 'webgl', 'experimental-webgl' ];


                    if ( _this.isWebGL1Renderer === true ) {


                        contextNames.shift();


                    }


                    _gl = getContext( contextNames, contextAttributes );


                    if ( _gl === null ) {


                        if ( getContext( contextNames ) ) {


                            throw new Error( 'Error creating WebGL context with your selected attributes.' );


                        } else {


                            throw new Error( 'Error creating WebGL context.' );


                        }


                    }


                }


                if ( typeof WebGLRenderingContext !== 'undefined' && _gl instanceof WebGLRenderingContext ) { // @deprecated, r153


                    console.warn( 'THREE.WebGLRenderer: WebGL 1 support was deprecated in r153 and will be removed in r163.' );


                }


                // Some experimental-webgl implementations do not have getShaderPrecisionFormat


                if ( _gl.getShaderPrecisionFormat === undefined ) {


                    _gl.getShaderPrecisionFormat = function () {


                        return { 'rangeMin': 1, 'rangeMax': 1, 'precision': 1 };


                    };


                }


            } catch ( error ) {


                console.error( 'THREE.WebGLRenderer: ' + error.message );

                throw error;


            }


            let extensions, capabilities, state, info;

            let properties, textures, cubemaps, cubeuvmaps, attributes, geometries, objects;

            let programCache, materials, renderLists, renderStates, clipping, shadowMap;


            let background, morphtargets, bufferRenderer, indexedBufferRenderer;


            let utils, bindingStates, uniformsGroups;


            function initGLContext() {


                extensions = new WebGLExtensions( _gl );


                capabilities = new WebGLCapabilities( _gl, extensions, parameters );


                extensions.init( capabilities );


                utils = new WebGLUtils( _gl, extensions, capabilities );


                state = new WebGLState( _gl, extensions, capabilities );


                info = new WebGLInfo( _gl );

                properties = new WebGLProperties();

                textures = new WebGLTextures( _gl, extensions, state, properties, capabilities, utils, info );

                cubemaps = new WebGLCubeMaps( _this );

                cubeuvmaps = new WebGLCubeUVMaps( _this );

                attributes = new WebGLAttributes( _gl, capabilities );

                bindingStates = new WebGLBindingStates( _gl, extensions, attributes, capabilities );

                geometries = new WebGLGeometries( _gl, attributes, info, bindingStates );

                objects = new WebGLObjects( _gl, geometries, attributes, info );

                morphtargets = new WebGLMorphtargets( _gl, capabilities, textures );

                clipping = new WebGLClipping( properties );

                programCache = new WebGLPrograms( _this, cubemaps, cubeuvmaps, extensions, capabilities, bindingStates, clipping );

                materials = new WebGLMaterials( _this, properties );

                renderLists = new WebGLRenderLists();

                renderStates = new WebGLRenderStates( extensions, capabilities );

                background = new WebGLBackground( _this, cubemaps, cubeuvmaps, state, objects, _alpha, premultipliedAlpha );

                shadowMap = new WebGLShadowMap( _this, objects, capabilities );

                uniformsGroups = new WebGLUniformsGroups( _gl, info, capabilities, state );


                bufferRenderer = new WebGLBufferRenderer( _gl, extensions, info, capabilities );

                indexedBufferRenderer = new WebGLIndexedBufferRenderer( _gl, extensions, info, capabilities );


                info.programs = programCache.programs;


                _this.capabilities = capabilities;

                _this.extensions = extensions;

                _this.properties = properties;

                _this.renderLists = renderLists;

                _this.shadowMap = shadowMap;

                _this.state = state;

                _this.info = info;


            }


            initGLContext();


            // xr


            const xr = new WebXRManager( _this, _gl );


            this.xr = xr;


            // API


            this.getContext = function () {


                return _gl;


            };


            this.getContextAttributes = function () {


                return _gl.getContextAttributes();


            };


            this.forceContextLoss = function () {


                const extension = extensions.get( 'WEBGL_lose_context' );

                if ( extension ) extension.loseContext();


            };


            this.forceContextRestore = function () {


                const extension = extensions.get( 'WEBGL_lose_context' );

                if ( extension ) extension.restoreContext();


            };


            this.getPixelRatio = function () {


                return _pixelRatio;


            };


            this.setPixelRatio = function ( value ) {


                if ( value === undefined ) return;


                _pixelRatio = value;


                this.setSize( _width, _height, false );


            };


            this.getSize = function ( target ) {


                return target.set( _width, _height );


            };


            this.setSize = function ( width, height, updateStyle = true ) {


                if ( xr.isPresenting ) {


                    console.warn( 'THREE.WebGLRenderer: Can\'t change size while VR device is presenting.' );

                    return;


                }


                _width = width;

                _height = height;


                canvas.width = Math.floor( width * _pixelRatio );

                canvas.height = Math.floor( height * _pixelRatio );


                if ( updateStyle === true ) {


                    canvas.style.width = width + 'px';

                    canvas.style.height = height + 'px';


                }


                this.setViewport( 0, 0, width, height );


            };


            this.getDrawingBufferSize = function ( target ) {


                return target.set( _width * _pixelRatio, _height * _pixelRatio ).floor();


            };


            this.setDrawingBufferSize = function ( width, height, pixelRatio ) {


                _width = width;

                _height = height;


                _pixelRatio = pixelRatio;


                canvas.width = Math.floor( width * pixelRatio );

                canvas.height = Math.floor( height * pixelRatio );


                this.setViewport( 0, 0, width, height );


            };


            this.getCurrentViewport = function ( target ) {


                return target.copy( _currentViewport );


            };


            this.getViewport = function ( target ) {


                return target.copy( _viewport );


            };


            this.setViewport = function ( x, y, width, height ) {


                if ( x.isVector4 ) {


                    _viewport.set( x.x, x.y, x.z, x.w );


                } else {


                    _viewport.set( x, y, width, height );


                }


                state.viewport( _currentViewport.copy( _viewport ).multiplyScalar( _pixelRatio ).floor() );


            };


            this.getScissor = function ( target ) {


                return target.copy( _scissor );


            };


            this.setScissor = function ( x, y, width, height ) {


                if ( x.isVector4 ) {


                    _scissor.set( x.x, x.y, x.z, x.w );


                } else {


                    _scissor.set( x, y, width, height );


                }


                state.scissor( _currentScissor.copy( _scissor ).multiplyScalar( _pixelRatio ).floor() );


            };


            this.getScissorTest = function () {


                return _scissorTest;


            };


            this.setScissorTest = function ( boolean ) {


                state.setScissorTest( _scissorTest = boolean );


            };


            this.setOpaqueSort = function ( method ) {


                _opaqueSort = method;


            };


            this.setTransparentSort = function ( method ) {


                _transparentSort = method;


            };


            // Clearing


            this.getClearColor = function ( target ) {


                return target.copy( background.getClearColor() );


            };


            this.setClearColor = function () {


                background.setClearColor.apply( background, arguments );


            };


            this.getClearAlpha = function () {


                return background.getClearAlpha();


            };


            this.setClearAlpha = function () {


                background.setClearAlpha.apply( background, arguments );


            };


            this.clear = function ( color = true, depth = true, stencil = true ) {


                let bits = 0;


                if ( color ) {


                    // check if we're trying to clear an integer target

                    let isIntegerFormat = false;

                    if ( _currentRenderTarget !== null ) {


                        const targetFormat = _currentRenderTarget.texture.format;

                        isIntegerFormat = targetFormat === RGBAIntegerFormat ||

                            targetFormat === RGIntegerFormat ||

                            targetFormat === RedIntegerFormat;


                    }


                    // use the appropriate clear functions to clear the target if it's a signed

                    // or unsigned integer target

                    if ( isIntegerFormat ) {


                        const targetType = _currentRenderTarget.texture.type;

                        const isUnsignedType = targetType === UnsignedByteType ||

                            targetType === UnsignedIntType ||

                            targetType === UnsignedShortType ||

                            targetType === UnsignedInt248Type ||

                            targetType === UnsignedShort4444Type ||

                            targetType === UnsignedShort5551Type;


                        const clearColor = background.getClearColor();

                        const a = background.getClearAlpha();

                        const r = clearColor.r;

                        const g = clearColor.g;

                        const b = clearColor.b;


                        if ( isUnsignedType ) {


                            uintClearColor[ 0 ] = r;

                            uintClearColor[ 1 ] = g;

                            uintClearColor[ 2 ] = b;

                            uintClearColor[ 3 ] = a;

                            _gl.clearBufferuiv( _gl.COLOR, 0, uintClearColor );


                        } else {


                            intClearColor[ 0 ] = r;

                            intClearColor[ 1 ] = g;

                            intClearColor[ 2 ] = b;

                            intClearColor[ 3 ] = a;

                            _gl.clearBufferiv( _gl.COLOR, 0, intClearColor );


                        }


                    } else {


                        bits |= _gl.COLOR_BUFFER_BIT;


                    }


                }


                if ( depth ) bits |= _gl.DEPTH_BUFFER_BIT;

                if ( stencil ) {


                    bits |= _gl.STENCIL_BUFFER_BIT;

                    this.state.buffers.stencil.setMask( 0xffffffff );


                }


                _gl.clear( bits );


            };


            this.clearColor = function () {


                this.clear( true, false, false );


            };


            this.clearDepth = function () {


                this.clear( false, true, false );


            };


            this.clearStencil = function () {


                this.clear( false, false, true );


            };


            //


            this.dispose = function () {


                canvas.removeEventListener( 'webglcontextlost', onContextLost, false );

                canvas.removeEventListener( 'webglcontextrestored', onContextRestore, false );

                canvas.removeEventListener( 'webglcontextcreationerror', onContextCreationError, false );


                renderLists.dispose();

                renderStates.dispose();

                properties.dispose();

                cubemaps.dispose();

                cubeuvmaps.dispose();

                objects.dispose();

                bindingStates.dispose();

                uniformsGroups.dispose();

                programCache.dispose();


                xr.dispose();


                xr.removeEventListener( 'sessionstart', onXRSessionStart );

                xr.removeEventListener( 'sessionend', onXRSessionEnd );


                if ( _transmissionRenderTarget ) {


                    _transmissionRenderTarget.dispose();

                    _transmissionRenderTarget = null;


                }


                animation.stop();


            };


            // Events


            function onContextLost( event ) {


                event.preventDefault();


                console.log( 'THREE.WebGLRenderer: Context Lost.' );


                _isContextLost = true;


            }


            function onContextRestore( /* event */ ) {


                console.log( 'THREE.WebGLRenderer: Context Restored.' );


                _isContextLost = false;


                const infoAutoReset = info.autoReset;

                const shadowMapEnabled = shadowMap.enabled;

                const shadowMapAutoUpdate = shadowMap.autoUpdate;

                const shadowMapNeedsUpdate = shadowMap.needsUpdate;

                const shadowMapType = shadowMap.type;


                initGLContext();


                info.autoReset = infoAutoReset;

                shadowMap.enabled = shadowMapEnabled;

                shadowMap.autoUpdate = shadowMapAutoUpdate;

                shadowMap.needsUpdate = shadowMapNeedsUpdate;

                shadowMap.type = shadowMapType;


            }


            function onContextCreationError( event ) {


                console.error( 'THREE.WebGLRenderer: A WebGL context could not be created. Reason: ', event.statusMessage );


            }


            function onMaterialDispose( event ) {


                const material = event.target;


                material.removeEventListener( 'dispose', onMaterialDispose );


                deallocateMaterial( material );


            }


            // Buffer deallocation


            function deallocateMaterial( material ) {


                releaseMaterialProgramReferences( material );


                properties.remove( material );


            }


            function releaseMaterialProgramReferences( material ) {


                const programs = properties.get( material ).programs;


                if ( programs !== undefined ) {


                    programs.forEach( function ( program ) {


                        programCache.releaseProgram( program );


                    } );


                    if ( material.isShaderMaterial ) {


                        programCache.releaseShaderCache( material );


                    }


                }


            }


            // Buffer rendering


            this.renderBufferDirect = function ( camera, scene, geometry, material, object, group ) {


                if ( scene === null ) scene = _emptyScene; // renderBufferDirect second parameter used to be fog (could be null)


                const frontFaceCW = ( object.isMesh && object.matrixWorld.determinant() < 0 );


                const program = setProgram( camera, scene, geometry, material, object );


                state.setMaterial( material, frontFaceCW );


                //


                let index = geometry.index;

                let rangeFactor = 1;


                if ( material.wireframe === true ) {


                    index = geometries.getWireframeAttribute( geometry );


                    if ( index === undefined ) return;


                    rangeFactor = 2;


                }


                //


                const drawRange = geometry.drawRange;

                const position = geometry.attributes.position;


                let drawStart = drawRange.start * rangeFactor;

                let drawEnd = ( drawRange.start + drawRange.count ) * rangeFactor;


                if ( group !== null ) {


                    drawStart = Math.max( drawStart, group.start * rangeFactor );

                    drawEnd = Math.min( drawEnd, ( group.start + group.count ) * rangeFactor );


                }


                if ( index !== null ) {


                    drawStart = Math.max( drawStart, 0 );

                    drawEnd = Math.min( drawEnd, index.count );


                } else if ( position !== undefined && position !== null ) {


                    drawStart = Math.max( drawStart, 0 );

                    drawEnd = Math.min( drawEnd, position.count );


                }


                const drawCount = drawEnd - drawStart;


                if ( drawCount < 0 || drawCount === Infinity ) return;


                //


                bindingStates.setup( object, material, program, geometry, index );


                let attribute;

                let renderer = bufferRenderer;


                if ( index !== null ) {


                    attribute = attributes.get( index );


                    renderer = indexedBufferRenderer;

                    renderer.setIndex( attribute );


                }


                //


                if ( object.isMesh ) {


                    if ( material.wireframe === true ) {


                        state.setLineWidth( material.wireframeLinewidth * getTargetPixelRatio() );

                        renderer.setMode( _gl.LINES );


                    } else {


                        renderer.setMode( _gl.TRIANGLES );


                    }


                } else if ( object.isLine ) {


                    let lineWidth = material.linewidth;


                    if ( lineWidth === undefined ) lineWidth = 1; // Not using Line*Material


                    state.setLineWidth( lineWidth * getTargetPixelRatio() );


                    if ( object.isLineSegments ) {


                        renderer.setMode( _gl.LINES );


                    } else if ( object.isLineLoop ) {


                        renderer.setMode( _gl.LINE_LOOP );


                    } else {


                        renderer.setMode( _gl.LINE_STRIP );


                    }


                } else if ( object.isPoints ) {


                    renderer.setMode( _gl.POINTS );


                } else if ( object.isSprite ) {


                    renderer.setMode( _gl.TRIANGLES );


                }


                if ( object.isBatchedMesh ) {


                    renderer.renderMultiDraw( object._multiDrawStarts, object._multiDrawCounts, object._multiDrawCount );


                } else if ( object.isInstancedMesh ) {


                    renderer.renderInstances( drawStart, drawCount, object.count );


                } else if ( geometry.isInstancedBufferGeometry ) {


                    const maxInstanceCount = geometry._maxInstanceCount !== undefined ? geometry._maxInstanceCount : Infinity;

                    const instanceCount = Math.min( geometry.instanceCount, maxInstanceCount );


                    renderer.renderInstances( drawStart, drawCount, instanceCount );


                } else {


                    renderer.render( drawStart, drawCount );


                }


            };


            // Compile


            function prepareMaterial( material, scene, object ) {


                if ( material.transparent === true && material.side === DoubleSide && material.forceSinglePass === false ) {


                    material.side = BackSide;

                    material.needsUpdate = true;

                    getProgram( material, scene, object );


                    material.side = FrontSide;

                    material.needsUpdate = true;

                    getProgram( material, scene, object );


                    material.side = DoubleSide;


                } else {


                    getProgram( material, scene, object );


                }


            }


            this.compile = function ( scene, camera, targetScene = null ) {


                if ( targetScene === null ) targetScene = scene;


                currentRenderState = renderStates.get( targetScene );

                currentRenderState.init();


                renderStateStack.push( currentRenderState );


                // gather lights from both the target scene and the new object that will be added to the scene.


                targetScene.traverseVisible( function ( object ) {


                    if ( object.isLight && object.layers.test( camera.layers ) ) {


                        currentRenderState.pushLight( object );


                        if ( object.castShadow ) {


                            currentRenderState.pushShadow( object );


                        }


                    }


                } );


                if ( scene !== targetScene ) {


                    scene.traverseVisible( function ( object ) {


                        if ( object.isLight && object.layers.test( camera.layers ) ) {


                            currentRenderState.pushLight( object );


                            if ( object.castShadow ) {


                                currentRenderState.pushShadow( object );


                            }


                        }


                    } );


                }


                currentRenderState.setupLights( _this._useLegacyLights );


                // Only initialize materials in the new scene, not the targetScene.


                const materials = new Set();


                scene.traverse( function ( object ) {


                    const material = object.material;


                    if ( material ) {


                        if ( Array.isArray( material ) ) {


                            for ( let i = 0; i < material.length; i ++ ) {


                                const material2 = material[ i ];


                                prepareMaterial( material2, targetScene, object );

                                materials.add( material2 );


                            }


                        } else {


                            prepareMaterial( material, targetScene, object );

                            materials.add( material );


                        }


                    }


                } );


                renderStateStack.pop();

                currentRenderState = null;


                return materials;


            };


            // compileAsync


            this.compileAsync = function ( scene, camera, targetScene = null ) {


                const materials = this.compile( scene, camera, targetScene );


                // Wait for all the materials in the new object to indicate that they're

                // ready to be used before resolving the promise.


                return new Promise( ( resolve ) => {


                    function checkMaterialsReady() {


                        materials.forEach( function ( material ) {


                            const materialProperties = properties.get( material );

                            const program = materialProperties.currentProgram;


                            if ( program.isReady() ) {


                                // remove any programs that report they're ready to use from the list

                                materials.delete( material );


                            }


                        } );


                        // once the list of compiling materials is empty, call the callback


                        if ( materials.size === 0 ) {


                            resolve( scene );

                            return;


                        }


                        // if some materials are still not ready, wait a bit and check again


                        setTimeout( checkMaterialsReady, 10 );


                    }


                    if ( extensions.get( 'KHR_parallel_shader_compile' ) !== null ) {


                        // If we can check the compilation status of the materials without

                        // blocking then do so right away.


                        checkMaterialsReady();


                    } else {


                        // Otherwise start by waiting a bit to give the materials we just

                        // initialized a chance to finish.


                        setTimeout( checkMaterialsReady, 10 );


                    }


                } );


            };


            // Animation Loop


            let onAnimationFrameCallback = null;


            function onAnimationFrame( time ) {


                if ( onAnimationFrameCallback ) onAnimationFrameCallback( time );


            }


            function onXRSessionStart() {


                animation.stop();


            }


            function onXRSessionEnd() {


                animation.start();


            }


            const animation = new WebGLAnimation();

            animation.setAnimationLoop( onAnimationFrame );


            if ( typeof self !== 'undefined' ) animation.setContext( self );


            this.setAnimationLoop = function ( callback ) {


                onAnimationFrameCallback = callback;

                xr.setAnimationLoop( callback );


                ( callback === null ) ? animation.stop() : animation.start();


            };


            xr.addEventListener( 'sessionstart', onXRSessionStart );

            xr.addEventListener( 'sessionend', onXRSessionEnd );


            // Rendering


            this.render = function ( scene, camera ) {


                if ( camera !== undefined && camera.isCamera !== true ) {


                    console.error( 'THREE.WebGLRenderer.render: camera is not an instance of THREE.Camera.' );

                    return;


                }


                if ( _isContextLost === true ) return;


                // update scene graph


                if ( scene.matrixWorldAutoUpdate === true ) scene.updateMatrixWorld();


                // update camera matrices and frustum


                if ( camera.parent === null && camera.matrixWorldAutoUpdate === true ) camera.updateMatrixWorld();


                if ( xr.enabled === true && xr.isPresenting === true ) {


                    if ( xr.cameraAutoUpdate === true ) xr.updateCamera( camera );


                    camera = xr.getCamera(); // use XR camera for rendering


                }


                //

                if ( scene.isScene === true ) scene.onBeforeRender( _this, scene, camera, _currentRenderTarget );


                currentRenderState = renderStates.get( scene, renderStateStack.length );

                currentRenderState.init();


                renderStateStack.push( currentRenderState );


                _projScreenMatrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );

                _frustum.setFromProjectionMatrix( _projScreenMatrix );


                _localClippingEnabled = this.localClippingEnabled;

                _clippingEnabled = clipping.init( this.clippingPlanes, _localClippingEnabled );


                currentRenderList = renderLists.get( scene, renderListStack.length );

                currentRenderList.init();


                renderListStack.push( currentRenderList );


                projectObject( scene, camera, 0, _this.sortObjects );


                currentRenderList.finish();


                if ( _this.sortObjects === true ) {


                    currentRenderList.sort( _opaqueSort, _transparentSort );


                }


                //


                this.info.render.frame ++;


                if ( _clippingEnabled === true ) clipping.beginShadows();


                const shadowsArray = currentRenderState.state.shadowsArray;


                shadowMap.render( shadowsArray, scene, camera );


                if ( _clippingEnabled === true ) clipping.endShadows();


                //


                if ( this.info.autoReset === true ) this.info.reset();


                //


                background.render( currentRenderList, scene );


                // render scene


                currentRenderState.setupLights( _this._useLegacyLights );


                if ( camera.isArrayCamera ) {


                    const cameras = camera.cameras;


                    for ( let i = 0, l = cameras.length; i < l; i ++ ) {


                        const camera2 = cameras[ i ];


                        renderScene( currentRenderList, scene, camera2, camera2.viewport );


                    }


                } else {


                    renderScene( currentRenderList, scene, camera );


                }


                //


                if ( _currentRenderTarget !== null ) {


                    // resolve multisample renderbuffers to a single-sample texture if necessary


                    textures.updateMultisampleRenderTarget( _currentRenderTarget );


                    // Generate mipmap if we're using any kind of mipmap filtering


                    textures.updateRenderTargetMipmap( _currentRenderTarget );


                }


                //


                if ( scene.isScene === true ) scene.onAfterRender( _this, scene, camera );


                // _gl.finish();


                bindingStates.resetDefaultState();

                _currentMaterialId = - 1;

                _currentCamera = null;


                renderStateStack.pop();


                if ( renderStateStack.length > 0 ) {


                    currentRenderState = renderStateStack[ renderStateStack.length - 1 ];


                } else {


                    currentRenderState = null;


                }


                renderListStack.pop();


                if ( renderListStack.length > 0 ) {


                    currentRenderList = renderListStack[ renderListStack.length - 1 ];


                } else {


                    currentRenderList = null;


                }


            };


            function projectObject( object, camera, groupOrder, sortObjects ) {


                if ( object.visible === false ) return;


                const visible = object.layers.test( camera.layers );


                if ( visible ) {


                    if ( object.isGroup ) {


                        groupOrder = object.renderOrder;


                    } else if ( object.isLOD ) {


                        if ( object.autoUpdate === true ) object.update( camera );


                    } else if ( object.isLight ) {


                        currentRenderState.pushLight( object );


                        if ( object.castShadow ) {


                            currentRenderState.pushShadow( object );


                        }


                    } else if ( object.isSprite ) {


                        if ( ! object.frustumCulled || _frustum.intersectsSprite( object ) ) {


                            if ( sortObjects ) {


                                _vector3.setFromMatrixPosition( object.matrixWorld )

                                    .applyMatrix4( _projScreenMatrix );


                            }


                            const geometry = objects.update( object );

                            const material = object.material;


                            if ( material.visible ) {


                                currentRenderList.push( object, geometry, material, groupOrder, _vector3.z, null );


                            }


                        }


                    } else if ( object.isMesh || object.isLine || object.isPoints ) {


                        if ( ! object.frustumCulled || _frustum.intersectsObject( object ) ) {


                            const geometry = objects.update( object );

                            const material = object.material;


                            if ( sortObjects ) {


                                if ( object.boundingSphere !== undefined ) {


                                    if ( object.boundingSphere === null ) object.computeBoundingSphere();

                                    _vector3.copy( object.boundingSphere.center );


                                } else {


                                    if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

                                    _vector3.copy( geometry.boundingSphere.center );


                                }


                                _vector3

                                    .applyMatrix4( object.matrixWorld )

                                    .applyMatrix4( _projScreenMatrix );


                            }


                            if ( Array.isArray( material ) ) {


                                const groups = geometry.groups;


                                for ( let i = 0, l = groups.length; i < l; i ++ ) {


                                    const group = groups[ i ];

                                    const groupMaterial = material[ group.materialIndex ];


                                    if ( groupMaterial && groupMaterial.visible ) {


                                        currentRenderList.push( object, geometry, groupMaterial, groupOrder, _vector3.z, group );


                                    }


                                }


                            } else if ( material.visible ) {


                                currentRenderList.push( object, geometry, material, groupOrder, _vector3.z, null );


                            }


                        }


                    }


                }


                const children = object.children;


                for ( let i = 0, l = children.length; i < l; i ++ ) {


                    projectObject( children[ i ], camera, groupOrder, sortObjects );


                }


            }


            function renderScene( currentRenderList, scene, camera, viewport ) {


                const opaqueObjects = currentRenderList.opaque;

                const transmissiveObjects = currentRenderList.transmissive;

                const transparentObjects = currentRenderList.transparent;


                currentRenderState.setupLightsView( camera );


                if ( _clippingEnabled === true ) clipping.setGlobalState( _this.clippingPlanes, camera );


                if ( transmissiveObjects.length > 0 ) renderTransmissionPass( opaqueObjects, transmissiveObjects, scene, camera );


                if ( viewport ) state.viewport( _currentViewport.copy( viewport ) );


                if ( opaqueObjects.length > 0 ) renderObjects( opaqueObjects, scene, camera );

                if ( transmissiveObjects.length > 0 ) renderObjects( transmissiveObjects, scene, camera );

                if ( transparentObjects.length > 0 ) renderObjects( transparentObjects, scene, camera );


                // Ensure depth buffer writing is enabled so it can be cleared on next render


                state.buffers.depth.setTest( true );

                state.buffers.depth.setMask( true );

                state.buffers.color.setMask( true );


                state.setPolygonOffset( false );


            }


            function renderTransmissionPass( opaqueObjects, transmissiveObjects, scene, camera ) {


                const overrideMaterial = scene.isScene === true ? scene.overrideMaterial : null;


                if ( overrideMaterial !== null ) {


                    return;


                }


                const isWebGL2 = capabilities.isWebGL2;


                if ( _transmissionRenderTarget === null ) {


                    _transmissionRenderTarget = new WebGLRenderTarget( 1, 1, {

                        generateMipmaps: true,

                        type: extensions.has( 'EXT_color_buffer_half_float' ) ? HalfFloatType : UnsignedByteType,

                        minFilter: LinearMipmapLinearFilter,

                        samples: ( isWebGL2 ) ? 4 : 0

                    } );


                    // debug


                    /*

                    const geometry = new PlaneGeometry();

                    const material = new MeshBasicMaterial( { map: _transmissionRenderTarget.texture } );


                    const mesh = new Mesh( geometry, material );

                    scene.add( mesh );

                    */


                }


                _this.getDrawingBufferSize( _vector2 );


                if ( isWebGL2 ) {


                    _transmissionRenderTarget.setSize( _vector2.x, _vector2.y );


                } else {


                    _transmissionRenderTarget.setSize( floorPowerOfTwo( _vector2.x ), floorPowerOfTwo( _vector2.y ) );


                }


                //


                const currentRenderTarget = _this.getRenderTarget();

                _this.setRenderTarget( _transmissionRenderTarget );


                _this.getClearColor( _currentClearColor );

                _currentClearAlpha = _this.getClearAlpha();

                if ( _currentClearAlpha < 1 ) _this.setClearColor( 0xffffff, 0.5 );


                _this.clear();


                // Turn off the features which can affect the frag color for opaque objects pass.

                // Otherwise they are applied twice in opaque objects pass and transmission objects pass.

                const currentToneMapping = _this.toneMapping;

                _this.toneMapping = NoToneMapping;


                renderObjects( opaqueObjects, scene, camera );


                textures.updateMultisampleRenderTarget( _transmissionRenderTarget );

                textures.updateRenderTargetMipmap( _transmissionRenderTarget );


                let renderTargetNeedsUpdate = false;


                for ( let i = 0, l = transmissiveObjects.length; i < l; i ++ ) {


                    const renderItem = transmissiveObjects[ i ];


                    const object = renderItem.object;

                    const geometry = renderItem.geometry;

                    const material = renderItem.material;

                    const group = renderItem.group;


                    if ( material.side === DoubleSide && object.layers.test( camera.layers ) ) {


                        const currentSide = material.side;


                        material.side = BackSide;

                        material.needsUpdate = true;


                        renderObject( object, scene, camera, geometry, material, group );


                        material.side = currentSide;

                        material.needsUpdate = true;


                        renderTargetNeedsUpdate = true;


                    }


                }


                if ( renderTargetNeedsUpdate === true ) {


                    textures.updateMultisampleRenderTarget( _transmissionRenderTarget );

                    textures.updateRenderTargetMipmap( _transmissionRenderTarget );


                }


                _this.setRenderTarget( currentRenderTarget );


                _this.setClearColor( _currentClearColor, _currentClearAlpha );


                _this.toneMapping = currentToneMapping;


            }


            function renderObjects( renderList, scene, camera ) {


                const overrideMaterial = scene.isScene === true ? scene.overrideMaterial : null;


                for ( let i = 0, l = renderList.length; i < l; i ++ ) {


                    const renderItem = renderList[ i ];


                    const object = renderItem.object;

                    const geometry = renderItem.geometry;

                    const material = overrideMaterial === null ? renderItem.material : overrideMaterial;

                    const group = renderItem.group;


                    if ( object.layers.test( camera.layers ) ) {


                        renderObject( object, scene, camera, geometry, material, group );


                    }


                }


            }


            function renderObject( object, scene, camera, geometry, material, group ) {


                object.onBeforeRender( _this, scene, camera, geometry, material, group );


                object.modelViewMatrix.multiplyMatrices( camera.matrixWorldInverse, object.matrixWorld );

                object.normalMatrix.getNormalMatrix( object.modelViewMatrix );


                material.onBeforeRender( _this, scene, camera, geometry, object, group );


                if ( material.transparent === true && material.side === DoubleSide && material.forceSinglePass === false ) {


                    material.side = BackSide;

                    material.needsUpdate = true;

                    _this.renderBufferDirect( camera, scene, geometry, material, object, group );


                    material.side = FrontSide;

                    material.needsUpdate = true;

                    _this.renderBufferDirect( camera, scene, geometry, material, object, group );


                    material.side = DoubleSide;


                } else {


                    _this.renderBufferDirect( camera, scene, geometry, material, object, group );


                }


                object.onAfterRender( _this, scene, camera, geometry, material, group );


            }


            function getProgram( material, scene, object ) {


                if ( scene.isScene !== true ) scene = _emptyScene; // scene could be a Mesh, Line, Points, ...


                const materialProperties = properties.get( material );


                const lights = currentRenderState.state.lights;

                const shadowsArray = currentRenderState.state.shadowsArray;


                const lightsStateVersion = lights.state.version;


                const parameters = programCache.getParameters( material, lights.state, shadowsArray, scene, object );

                const programCacheKey = programCache.getProgramCacheKey( parameters );


                let programs = materialProperties.programs;


                // always update environment and fog - changing these trigger an getProgram call, but it's possible that the program doesn't change


                materialProperties.environment = material.isMeshStandardMaterial ? scene.environment : null;

                materialProperties.fog = scene.fog;

                materialProperties.envMap = ( material.isMeshStandardMaterial ? cubeuvmaps : cubemaps ).get( material.envMap || materialProperties.environment );


                if ( programs === undefined ) {


                    // new material


                    material.addEventListener( 'dispose', onMaterialDispose );


                    programs = new Map();

                    materialProperties.programs = programs;


                }


                let program = programs.get( programCacheKey );


                if ( program !== undefined ) {


                    // early out if program and light state is identical


                    if ( materialProperties.currentProgram === program && materialProperties.lightsStateVersion === lightsStateVersion ) {


                        updateCommonMaterialProperties( material, parameters );


                        return program;


                    }


                } else {


                    parameters.uniforms = programCache.getUniforms( material );


                    material.onBuild( object, parameters, _this );


                    material.onBeforeCompile( parameters, _this );


                    program = programCache.acquireProgram( parameters, programCacheKey );

                    programs.set( programCacheKey, program );


                    materialProperties.uniforms = parameters.uniforms;


                }


                const uniforms = materialProperties.uniforms;


                if ( ( ! material.isShaderMaterial && ! material.isRawShaderMaterial ) || material.clipping === true ) {


                    uniforms.clippingPlanes = clipping.uniform;


                }


                updateCommonMaterialProperties( material, parameters );


                // store the light setup it was created for


                materialProperties.needsLights = materialNeedsLights( material );

                materialProperties.lightsStateVersion = lightsStateVersion;


                if ( materialProperties.needsLights ) {


                    // wire up the material to this renderer's lighting state


                    uniforms.ambientLightColor.value = lights.state.ambient;

                    uniforms.lightProbe.value = lights.state.probe;

                    uniforms.directionalLights.value = lights.state.directional;

                    uniforms.directionalLightShadows.value = lights.state.directionalShadow;

                    uniforms.spotLights.value = lights.state.spot;

                    uniforms.spotLightShadows.value = lights.state.spotShadow;

                    uniforms.rectAreaLights.value = lights.state.rectArea;

                    uniforms.ltc_1.value = lights.state.rectAreaLTC1;

                    uniforms.ltc_2.value = lights.state.rectAreaLTC2;

                    uniforms.pointLights.value = lights.state.point;

                    uniforms.pointLightShadows.value = lights.state.pointShadow;

                    uniforms.hemisphereLights.value = lights.state.hemi;


                    uniforms.directionalShadowMap.value = lights.state.directionalShadowMap;

                    uniforms.directionalShadowMatrix.value = lights.state.directionalShadowMatrix;

                    uniforms.spotShadowMap.value = lights.state.spotShadowMap;

                    uniforms.spotLightMatrix.value = lights.state.spotLightMatrix;

                    uniforms.spotLightMap.value = lights.state.spotLightMap;

                    uniforms.pointShadowMap.value = lights.state.pointShadowMap;

                    uniforms.pointShadowMatrix.value = lights.state.pointShadowMatrix;

                    // TODO (abelnation): add area lights shadow info to uniforms


                }


                materialProperties.currentProgram = program;

                materialProperties.uniformsList = null;


                return program;


            }


            function getUniformList( materialProperties ) {


                if ( materialProperties.uniformsList === null ) {


                    const progUniforms = materialProperties.currentProgram.getUniforms();

                    materialProperties.uniformsList = WebGLUniforms.seqWithValue( progUniforms.seq, materialProperties.uniforms );


                }


                return materialProperties.uniformsList;


            }


            function updateCommonMaterialProperties( material, parameters ) {


                const materialProperties = properties.get( material );


                materialProperties.outputColorSpace = parameters.outputColorSpace;

                materialProperties.batching = parameters.batching;

                materialProperties.instancing = parameters.instancing;

                materialProperties.instancingColor = parameters.instancingColor;

                materialProperties.skinning = parameters.skinning;

                materialProperties.morphTargets = parameters.morphTargets;

                materialProperties.morphNormals = parameters.morphNormals;

                materialProperties.morphColors = parameters.morphColors;

                materialProperties.morphTargetsCount = parameters.morphTargetsCount;

                materialProperties.numClippingPlanes = parameters.numClippingPlanes;

                materialProperties.numIntersection = parameters.numClipIntersection;

                materialProperties.vertexAlphas = parameters.vertexAlphas;

                materialProperties.vertexTangents = parameters.vertexTangents;

                materialProperties.toneMapping = parameters.toneMapping;


            }


            function setProgram( camera, scene, geometry, material, object ) {


                if ( scene.isScene !== true ) scene = _emptyScene; // scene could be a Mesh, Line, Points, ...


                textures.resetTextureUnits();


                const fog = scene.fog;

                const environment = material.isMeshStandardMaterial ? scene.environment : null;

                const colorSpace = ( _currentRenderTarget === null ) ? _this.outputColorSpace : ( _currentRenderTarget.isXRRenderTarget === true ? _currentRenderTarget.texture.colorSpace : LinearSRGBColorSpace );

                const envMap = ( material.isMeshStandardMaterial ? cubeuvmaps : cubemaps ).get( material.envMap || environment );

                const vertexAlphas = material.vertexColors === true && !! geometry.attributes.color && geometry.attributes.color.itemSize === 4;

                const vertexTangents = !! geometry.attributes.tangent && ( !! material.normalMap || material.anisotropy > 0 );

                const morphTargets = !! geometry.morphAttributes.position;

                const morphNormals = !! geometry.morphAttributes.normal;

                const morphColors = !! geometry.morphAttributes.color;


                let toneMapping = NoToneMapping;


                if ( material.toneMapped ) {


                    if ( _currentRenderTarget === null || _currentRenderTarget.isXRRenderTarget === true ) {


                        toneMapping = _this.toneMapping;


                    }


                }


                const morphAttribute = geometry.morphAttributes.position || geometry.morphAttributes.normal || geometry.morphAttributes.color;

                const morphTargetsCount = ( morphAttribute !== undefined ) ? morphAttribute.length : 0;


                const materialProperties = properties.get( material );

                const lights = currentRenderState.state.lights;


                if ( _clippingEnabled === true ) {


                    if ( _localClippingEnabled === true || camera !== _currentCamera ) {


                        const useCache =

                            camera === _currentCamera &&

                            material.id === _currentMaterialId;


                        // we might want to call this function with some ClippingGroup

                        // object instead of the material, once it becomes feasible

                        // (#8465, #8379)

                        clipping.setState( material, camera, useCache );


                    }


                }


                //


                let needsProgramChange = false;


                if ( material.version === materialProperties.__version ) {


                    if ( materialProperties.needsLights && ( materialProperties.lightsStateVersion !== lights.state.version ) ) {


                        needsProgramChange = true;


                    } else if ( materialProperties.outputColorSpace !== colorSpace ) {


                        needsProgramChange = true;


                    } else if ( object.isBatchedMesh && materialProperties.batching === false ) {


                        needsProgramChange = true;


                    } else if ( ! object.isBatchedMesh && materialProperties.batching === true ) {


                        needsProgramChange = true;


                    } else if ( object.isInstancedMesh && materialProperties.instancing === false ) {


                        needsProgramChange = true;


                    } else if ( ! object.isInstancedMesh && materialProperties.instancing === true ) {


                        needsProgramChange = true;


                    } else if ( object.isSkinnedMesh && materialProperties.skinning === false ) {


                        needsProgramChange = true;


                    } else if ( ! object.isSkinnedMesh && materialProperties.skinning === true ) {


                        needsProgramChange = true;


                    } else if ( object.isInstancedMesh && materialProperties.instancingColor === true && object.instanceColor === null ) {


                        needsProgramChange = true;


                    } else if ( object.isInstancedMesh && materialProperties.instancingColor === false && object.instanceColor !== null ) {


                        needsProgramChange = true;


                    } else if ( materialProperties.envMap !== envMap ) {


                        needsProgramChange = true;


                    } else if ( material.fog === true && materialProperties.fog !== fog ) {


                        needsProgramChange = true;


                    } else if ( materialProperties.numClippingPlanes !== undefined &&

                        ( materialProperties.numClippingPlanes !== clipping.numPlanes ||

                        materialProperties.numIntersection !== clipping.numIntersection ) ) {


                        needsProgramChange = true;


                    } else if ( materialProperties.vertexAlphas !== vertexAlphas ) {


                        needsProgramChange = true;


                    } else if ( materialProperties.vertexTangents !== vertexTangents ) {


                        needsProgramChange = true;


                    } else if ( materialProperties.morphTargets !== morphTargets ) {


                        needsProgramChange = true;


                    } else if ( materialProperties.morphNormals !== morphNormals ) {


                        needsProgramChange = true;


                    } else if ( materialProperties.morphColors !== morphColors ) {


                        needsProgramChange = true;


                    } else if ( materialProperties.toneMapping !== toneMapping ) {


                        needsProgramChange = true;


                    } else if ( capabilities.isWebGL2 === true && materialProperties.morphTargetsCount !== morphTargetsCount ) {


                        needsProgramChange = true;


                    }


                } else {


                    needsProgramChange = true;

                    materialProperties.__version = material.version;


                }


                //


                let program = materialProperties.currentProgram;


                if ( needsProgramChange === true ) {


                    program = getProgram( material, scene, object );


                }


                let refreshProgram = false;

                let refreshMaterial = false;

                let refreshLights = false;


                const p_uniforms = program.getUniforms(),

                    m_uniforms = materialProperties.uniforms;


                if ( state.useProgram( program.program ) ) {


                    refreshProgram = true;

                    refreshMaterial = true;

                    refreshLights = true;


                }


                if ( material.id !== _currentMaterialId ) {


                    _currentMaterialId = material.id;


                    refreshMaterial = true;


                }


                if ( refreshProgram || _currentCamera !== camera ) {


                    // common camera uniforms


                    p_uniforms.setValue( _gl, 'projectionMatrix', camera.projectionMatrix );

                    p_uniforms.setValue( _gl, 'viewMatrix', camera.matrixWorldInverse );


                    const uCamPos = p_uniforms.map.cameraPosition;


                    if ( uCamPos !== undefined ) {


                        uCamPos.setValue( _gl, _vector3.setFromMatrixPosition( camera.matrixWorld ) );


                    }


                    if ( capabilities.logarithmicDepthBuffer ) {


                        p_uniforms.setValue( _gl, 'logDepthBufFC',

                            2.0 / ( Math.log( camera.far + 1.0 ) / Math.LN2 ) );


                    }


                    // consider moving isOrthographic to UniformLib and WebGLMaterials, see https://github.com/mrdoob/three.js/pull/26467#issuecomment-1645185067


                    if ( material.isMeshPhongMaterial ||

                        material.isMeshToonMaterial ||

                        material.isMeshLambertMaterial ||

                        material.isMeshBasicMaterial ||

                        material.isMeshStandardMaterial ||

                        material.isShaderMaterial ) {


                        p_uniforms.setValue( _gl, 'isOrthographic', camera.isOrthographicCamera === true );


                    }


                    if ( _currentCamera !== camera ) {


                        _currentCamera = camera;


                        // lighting uniforms depend on the camera so enforce an update

                        // now, in case this material supports lights - or later, when

                        // the next material that does gets activated:


                        refreshMaterial = true;     // set to true on material change

                        refreshLights = true;       // remains set until update done


                    }


                }


                // skinning and morph target uniforms must be set even if material didn't change

                // auto-setting of texture unit for bone and morph texture must go before other textures

                // otherwise textures used for skinning and morphing can take over texture units reserved for other material textures


                if ( object.isSkinnedMesh ) {


                    p_uniforms.setOptional( _gl, object, 'bindMatrix' );

                    p_uniforms.setOptional( _gl, object, 'bindMatrixInverse' );


                    const skeleton = object.skeleton;


                    if ( skeleton ) {


                        if ( capabilities.floatVertexTextures ) {


                            if ( skeleton.boneTexture === null ) skeleton.computeBoneTexture();


                            p_uniforms.setValue( _gl, 'boneTexture', skeleton.boneTexture, textures );


                        } else {


                            console.warn( 'THREE.WebGLRenderer: SkinnedMesh can only be used with WebGL 2. With WebGL 1 OES_texture_float and vertex textures support is required.' );


                        }


                    }


                }


                if ( object.isBatchedMesh ) {


                    p_uniforms.setOptional( _gl, object, 'batchingTexture' );

                    p_uniforms.setValue( _gl, 'batchingTexture', object._matricesTexture, textures );


                }


                const morphAttributes = geometry.morphAttributes;


                if ( morphAttributes.position !== undefined || morphAttributes.normal !== undefined || ( morphAttributes.color !== undefined && capabilities.isWebGL2 === true ) ) {


                    morphtargets.update( object, geometry, program );


                }


                if ( refreshMaterial || materialProperties.receiveShadow !== object.receiveShadow ) {


                    materialProperties.receiveShadow = object.receiveShadow;

                    p_uniforms.setValue( _gl, 'receiveShadow', object.receiveShadow );


                }


                // https://github.com/mrdoob/three.js/pull/24467#issuecomment-1209031512


                if ( material.isMeshGouraudMaterial && material.envMap !== null ) {


                    m_uniforms.envMap.value = envMap;


                    m_uniforms.flipEnvMap.value = ( envMap.isCubeTexture && envMap.isRenderTargetTexture === false ) ? - 1 : 1;


                }


                if ( refreshMaterial ) {


                    p_uniforms.setValue( _gl, 'toneMappingExposure', _this.toneMappingExposure );


                    if ( materialProperties.needsLights ) {


                        // the current material requires lighting info


                        // note: all lighting uniforms are always set correctly

                        // they simply reference the renderer's state for their

                        // values

                        //

                        // use the current material's .needsUpdate flags to set

                        // the GL state when required


                        markUniformsLightsNeedsUpdate( m_uniforms, refreshLights );


                    }


                    // refresh uniforms common to several materials


                    if ( fog && material.fog === true ) {


                        materials.refreshFogUniforms( m_uniforms, fog );


                    }


                    materials.refreshMaterialUniforms( m_uniforms, material, _pixelRatio, _height, _transmissionRenderTarget );


                    WebGLUniforms.upload( _gl, getUniformList( materialProperties ), m_uniforms, textures );


                }


                if ( material.isShaderMaterial && material.uniformsNeedUpdate === true ) {


                    WebGLUniforms.upload( _gl, getUniformList( materialProperties ), m_uniforms, textures );

                    material.uniformsNeedUpdate = false;


                }


                if ( material.isSpriteMaterial ) {


                    p_uniforms.setValue( _gl, 'center', object.center );


                }


                // common matrices


                p_uniforms.setValue( _gl, 'modelViewMatrix', object.modelViewMatrix );

                p_uniforms.setValue( _gl, 'normalMatrix', object.normalMatrix );

                p_uniforms.setValue( _gl, 'modelMatrix', object.matrixWorld );


                // UBOs


                if ( material.isShaderMaterial || material.isRawShaderMaterial ) {


                    const groups = material.uniformsGroups;


                    for ( let i = 0, l = groups.length; i < l; i ++ ) {


                        if ( capabilities.isWebGL2 ) {


                            const group = groups[ i ];


                            uniformsGroups.update( group, program );

                            uniformsGroups.bind( group, program );


                        } else {


                            console.warn( 'THREE.WebGLRenderer: Uniform Buffer Objects can only be used with WebGL 2.' );


                        }


                    }


                }


                return program;


            }


            // If uniforms are marked as clean, they don't need to be loaded to the GPU.


            function markUniformsLightsNeedsUpdate( uniforms, value ) {


                uniforms.ambientLightColor.needsUpdate = value;

                uniforms.lightProbe.needsUpdate = value;


                uniforms.directionalLights.needsUpdate = value;

                uniforms.directionalLightShadows.needsUpdate = value;

                uniforms.pointLights.needsUpdate = value;

                uniforms.pointLightShadows.needsUpdate = value;

                uniforms.spotLights.needsUpdate = value;

                uniforms.spotLightShadows.needsUpdate = value;

                uniforms.rectAreaLights.needsUpdate = value;

                uniforms.hemisphereLights.needsUpdate = value;


            }


            function materialNeedsLights( material ) {


                return material.isMeshLambertMaterial || material.isMeshToonMaterial || material.isMeshPhongMaterial ||

                    material.isMeshStandardMaterial || material.isShadowMaterial ||

                    ( material.isShaderMaterial && material.lights === true );


            }


            this.getActiveCubeFace = function () {


                return _currentActiveCubeFace;


            };


            this.getActiveMipmapLevel = function () {


                return _currentActiveMipmapLevel;


            };


            this.getRenderTarget = function () {


                return _currentRenderTarget;


            };


            this.setRenderTargetTextures = function ( renderTarget, colorTexture, depthTexture ) {


                properties.get( renderTarget.texture ).__webglTexture = colorTexture;

                properties.get( renderTarget.depthTexture ).__webglTexture = depthTexture;


                const renderTargetProperties = properties.get( renderTarget );

                renderTargetProperties.__hasExternalTextures = true;


                if ( renderTargetProperties.__hasExternalTextures ) {


                    renderTargetProperties.__autoAllocateDepthBuffer = depthTexture === undefined;


                    if ( ! renderTargetProperties.__autoAllocateDepthBuffer ) {


                        // The multisample_render_to_texture extension doesn't work properly if there

                        // are midframe flushes and an external depth buffer. Disable use of the extension.

                        if ( extensions.has( 'WEBGL_multisampled_render_to_texture' ) === true ) {


                            console.warn( 'THREE.WebGLRenderer: Render-to-texture extension was disabled because an external texture was provided' );

                            renderTargetProperties.__useRenderToTexture = false;


                        }


                    }


                }


            };


            this.setRenderTargetFramebuffer = function ( renderTarget, defaultFramebuffer ) {


                const renderTargetProperties = properties.get( renderTarget );

                renderTargetProperties.__webglFramebuffer = defaultFramebuffer;

                renderTargetProperties.__useDefaultFramebuffer = defaultFramebuffer === undefined;


            };


            this.setRenderTarget = function ( renderTarget, activeCubeFace = 0, activeMipmapLevel = 0 ) {


                _currentRenderTarget = renderTarget;

                _currentActiveCubeFace = activeCubeFace;

                _currentActiveMipmapLevel = activeMipmapLevel;


                let useDefaultFramebuffer = true;

                let framebuffer = null;

                let isCube = false;

                let isRenderTarget3D = false;


                if ( renderTarget ) {


                    const renderTargetProperties = properties.get( renderTarget );


                    if ( renderTargetProperties.__useDefaultFramebuffer !== undefined ) {


                        // We need to make sure to rebind the framebuffer.

                        state.bindFramebuffer( _gl.FRAMEBUFFER, null );

                        useDefaultFramebuffer = false;


                    } else if ( renderTargetProperties.__webglFramebuffer === undefined ) {


                        textures.setupRenderTarget( renderTarget );


                    } else if ( renderTargetProperties.__hasExternalTextures ) {


                        // Color and depth texture must be rebound in order for the swapchain to update.

                        textures.rebindTextures( renderTarget, properties.get( renderTarget.texture ).__webglTexture, properties.get( renderTarget.depthTexture ).__webglTexture );


                    }


                    const texture = renderTarget.texture;


                    if ( texture.isData3DTexture || texture.isDataArrayTexture || texture.isCompressedArrayTexture ) {


                        isRenderTarget3D = true;


                    }


                    const __webglFramebuffer = properties.get( renderTarget ).__webglFramebuffer;


                    if ( renderTarget.isWebGLCubeRenderTarget ) {


                        if ( Array.isArray( __webglFramebuffer[ activeCubeFace ] ) ) {


                            framebuffer = __webglFramebuffer[ activeCubeFace ][ activeMipmapLevel ];


                        } else {


                            framebuffer = __webglFramebuffer[ activeCubeFace ];


                        }


                        isCube = true;


                    } else if ( ( capabilities.isWebGL2 && renderTarget.samples > 0 ) && textures.useMultisampledRTT( renderTarget ) === false ) {


                        framebuffer = properties.get( renderTarget ).__webglMultisampledFramebuffer;


                    } else {


                        if ( Array.isArray( __webglFramebuffer ) ) {


                            framebuffer = __webglFramebuffer[ activeMipmapLevel ];


                        } else {


                            framebuffer = __webglFramebuffer;


                        }


                    }


                    _currentViewport.copy( renderTarget.viewport );

                    _currentScissor.copy( renderTarget.scissor );

                    _currentScissorTest = renderTarget.scissorTest;


                } else {


                    _currentViewport.copy( _viewport ).multiplyScalar( _pixelRatio ).floor();

                    _currentScissor.copy( _scissor ).multiplyScalar( _pixelRatio ).floor();

                    _currentScissorTest = _scissorTest;


                }


                const framebufferBound = state.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );


                if ( framebufferBound && capabilities.drawBuffers && useDefaultFramebuffer ) {


                    state.drawBuffers( renderTarget, framebuffer );


                }


                state.viewport( _currentViewport );

                state.scissor( _currentScissor );

                state.setScissorTest( _currentScissorTest );


                if ( isCube ) {


                    const textureProperties = properties.get( renderTarget.texture );

                    _gl.framebufferTexture2D( _gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_CUBE_MAP_POSITIVE_X + activeCubeFace, textureProperties.__webglTexture, activeMipmapLevel );


                } else if ( isRenderTarget3D ) {


                    const textureProperties = properties.get( renderTarget.texture );

                    const layer = activeCubeFace || 0;

                    _gl.framebufferTextureLayer( _gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0, textureProperties.__webglTexture, activeMipmapLevel || 0, layer );


                }


                _currentMaterialId = - 1; // reset current material to ensure correct uniform bindings


            };


            this.readRenderTargetPixels = function ( renderTarget, x, y, width, height, buffer, activeCubeFaceIndex ) {


                if ( ! ( renderTarget && renderTarget.isWebGLRenderTarget ) ) {


                    console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not THREE.WebGLRenderTarget.' );

                    return;


                }


                let framebuffer = properties.get( renderTarget ).__webglFramebuffer;


                if ( renderTarget.isWebGLCubeRenderTarget && activeCubeFaceIndex !== undefined ) {


                    framebuffer = framebuffer[ activeCubeFaceIndex ];


                }


                if ( framebuffer ) {


                    state.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );


                    try {


                        const texture = renderTarget.texture;

                        const textureFormat = texture.format;

                        const textureType = texture.type;


                        if ( textureFormat !== RGBAFormat && utils.convert( textureFormat ) !== _gl.getParameter( _gl.IMPLEMENTATION_COLOR_READ_FORMAT ) ) {


                            console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in RGBA or implementation defined format.' );

                            return;


                        }


                        const halfFloatSupportedByExt = ( textureType === HalfFloatType ) && ( extensions.has( 'EXT_color_buffer_half_float' ) || ( capabilities.isWebGL2 && extensions.has( 'EXT_color_buffer_float' ) ) );


                        if ( textureType !== UnsignedByteType && utils.convert( textureType ) !== _gl.getParameter( _gl.IMPLEMENTATION_COLOR_READ_TYPE ) && // Edge and Chrome Mac < 52 (#9513)

                            ! ( textureType === FloatType && ( capabilities.isWebGL2 || extensions.has( 'OES_texture_float' ) || extensions.has( 'WEBGL_color_buffer_float' ) ) ) && // Chrome Mac >= 52 and Firefox

                            ! halfFloatSupportedByExt ) {


                            console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in UnsignedByteType or implementation defined type.' );

                            return;


                        }


                        // the following if statement ensures valid read requests (no out-of-bounds pixels, see #8604)


                        if ( ( x >= 0 && x <= ( renderTarget.width - width ) ) && ( y >= 0 && y <= ( renderTarget.height - height ) ) ) {


                            _gl.readPixels( x, y, width, height, utils.convert( textureFormat ), utils.convert( textureType ), buffer );


                        }


                    } finally {


                        // restore framebuffer of current render target if necessary


                        const framebuffer = ( _currentRenderTarget !== null ) ? properties.get( _currentRenderTarget ).__webglFramebuffer : null;

                        state.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );


                    }


                }


            };


            this.copyFramebufferToTexture = function ( position, texture, level = 0 ) {


                const levelScale = Math.pow( 2, - level );

                const width = Math.floor( texture.image.width * levelScale );

                const height = Math.floor( texture.image.height * levelScale );


                textures.setTexture2D( texture, 0 );


                _gl.copyTexSubImage2D( _gl.TEXTURE_2D, level, 0, 0, position.x, position.y, width, height );


                state.unbindTexture();


            };


            this.copyTextureToTexture = function ( position, srcTexture, dstTexture, level = 0 ) {


                const width = srcTexture.image.width;

                const height = srcTexture.image.height;

                const glFormat = utils.convert( dstTexture.format );

                const glType = utils.convert( dstTexture.type );


                textures.setTexture2D( dstTexture, 0 );


                // As another texture upload may have changed pixelStorei

                // parameters, make sure they are correct for the dstTexture

                _gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, dstTexture.flipY );

                _gl.pixelStorei( _gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, dstTexture.premultiplyAlpha );

                _gl.pixelStorei( _gl.UNPACK_ALIGNMENT, dstTexture.unpackAlignment );


                if ( srcTexture.isDataTexture ) {


                    _gl.texSubImage2D( _gl.TEXTURE_2D, level, position.x, position.y, width, height, glFormat, glType, srcTexture.image.data );


                } else {


                    if ( srcTexture.isCompressedTexture ) {


                        _gl.compressedTexSubImage2D( _gl.TEXTURE_2D, level, position.x, position.y, srcTexture.mipmaps[ 0 ].width, srcTexture.mipmaps[ 0 ].height, glFormat, srcTexture.mipmaps[ 0 ].data );


                    } else {


                        _gl.texSubImage2D( _gl.TEXTURE_2D, level, position.x, position.y, glFormat, glType, srcTexture.image );


                    }


                }


                // Generate mipmaps only when copying level 0

                if ( level === 0 && dstTexture.generateMipmaps ) _gl.generateMipmap( _gl.TEXTURE_2D );


                state.unbindTexture();


            };


            this.copyTextureToTexture3D = function ( sourceBox, position, srcTexture, dstTexture, level = 0 ) {


                if ( _this.isWebGL1Renderer ) {


                    console.warn( 'THREE.WebGLRenderer.copyTextureToTexture3D: can only be used with WebGL2.' );

                    return;


                }


                const width = sourceBox.max.x - sourceBox.min.x + 1;

                const height = sourceBox.max.y - sourceBox.min.y + 1;

                const depth = sourceBox.max.z - sourceBox.min.z + 1;

                const glFormat = utils.convert( dstTexture.format );

                const glType = utils.convert( dstTexture.type );

                let glTarget;


                if ( dstTexture.isData3DTexture ) {


                    textures.setTexture3D( dstTexture, 0 );

                    glTarget = _gl.TEXTURE_3D;


                } else if ( dstTexture.isDataArrayTexture || dstTexture.isCompressedArrayTexture ) {


                    textures.setTexture2DArray( dstTexture, 0 );

                    glTarget = _gl.TEXTURE_2D_ARRAY;


                } else {


                    console.warn( 'THREE.WebGLRenderer.copyTextureToTexture3D: only supports THREE.DataTexture3D and THREE.DataTexture2DArray.' );

                    return;


                }


                _gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, dstTexture.flipY );

                _gl.pixelStorei( _gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, dstTexture.premultiplyAlpha );

                _gl.pixelStorei( _gl.UNPACK_ALIGNMENT, dstTexture.unpackAlignment );


                const unpackRowLen = _gl.getParameter( _gl.UNPACK_ROW_LENGTH );

                const unpackImageHeight = _gl.getParameter( _gl.UNPACK_IMAGE_HEIGHT );

                const unpackSkipPixels = _gl.getParameter( _gl.UNPACK_SKIP_PIXELS );

                const unpackSkipRows = _gl.getParameter( _gl.UNPACK_SKIP_ROWS );

                const unpackSkipImages = _gl.getParameter( _gl.UNPACK_SKIP_IMAGES );


                const image = srcTexture.isCompressedTexture ? srcTexture.mipmaps[ level ] : srcTexture.image;


                _gl.pixelStorei( _gl.UNPACK_ROW_LENGTH, image.width );

                _gl.pixelStorei( _gl.UNPACK_IMAGE_HEIGHT, image.height );

                _gl.pixelStorei( _gl.UNPACK_SKIP_PIXELS, sourceBox.min.x );

                _gl.pixelStorei( _gl.UNPACK_SKIP_ROWS, sourceBox.min.y );

                _gl.pixelStorei( _gl.UNPACK_SKIP_IMAGES, sourceBox.min.z );


                if ( srcTexture.isDataTexture || srcTexture.isData3DTexture ) {


                    _gl.texSubImage3D( glTarget, level, position.x, position.y, position.z, width, height, depth, glFormat, glType, image.data );


                } else {


                    if ( srcTexture.isCompressedArrayTexture ) {


                        console.warn( 'THREE.WebGLRenderer.copyTextureToTexture3D: untested support for compressed srcTexture.' );

                        _gl.compressedTexSubImage3D( glTarget, level, position.x, position.y, position.z, width, height, depth, glFormat, image.data );


                    } else {


                        _gl.texSubImage3D( glTarget, level, position.x, position.y, position.z, width, height, depth, glFormat, glType, image );


                    }


                }


                _gl.pixelStorei( _gl.UNPACK_ROW_LENGTH, unpackRowLen );

                _gl.pixelStorei( _gl.UNPACK_IMAGE_HEIGHT, unpackImageHeight );

                _gl.pixelStorei( _gl.UNPACK_SKIP_PIXELS, unpackSkipPixels );

                _gl.pixelStorei( _gl.UNPACK_SKIP_ROWS, unpackSkipRows );

                _gl.pixelStorei( _gl.UNPACK_SKIP_IMAGES, unpackSkipImages );


                // Generate mipmaps only when copying level 0

                if ( level === 0 && dstTexture.generateMipmaps ) _gl.generateMipmap( glTarget );


                state.unbindTexture();


            };


            this.initTexture = function ( texture ) {


                if ( texture.isCubeTexture ) {


                    textures.setTextureCube( texture, 0 );


                } else if ( texture.isData3DTexture ) {


                    textures.setTexture3D( texture, 0 );


                } else if ( texture.isDataArrayTexture || texture.isCompressedArrayTexture ) {


                    textures.setTexture2DArray( texture, 0 );


                } else {


                    textures.setTexture2D( texture, 0 );


                }


                state.unbindTexture();


            };


            this.resetState = function () {


                _currentActiveCubeFace = 0;

                _currentActiveMipmapLevel = 0;

                _currentRenderTarget = null;


                state.reset();

                bindingStates.reset();


            };


            if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {


                __THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'observe', { detail: this } ) );


            }


        }


        get coordinateSystem() {


            return WebGLCoordinateSystem;


        }


        get outputColorSpace() {


            return this._outputColorSpace;


        }


        set outputColorSpace( colorSpace ) {


            this._outputColorSpace = colorSpace;


            const gl = this.getContext();

            gl.drawingBufferColorSpace = colorSpace === DisplayP3ColorSpace ? 'display-p3' : 'srgb';

            gl.unpackColorSpace = ColorManagement.workingColorSpace === LinearDisplayP3ColorSpace ? 'display-p3' : 'srgb';


        }


        get outputEncoding() { // @deprecated, r152


            console.warn( 'THREE.WebGLRenderer: Property .outputEncoding has been removed. Use .outputColorSpace instead.' );

            return this.outputColorSpace === SRGBColorSpace ? sRGBEncoding : LinearEncoding;


        }


        set outputEncoding( encoding ) { // @deprecated, r152


            console.warn( 'THREE.WebGLRenderer: Property .outputEncoding has been removed. Use .outputColorSpace instead.' );

            this.outputColorSpace = encoding === sRGBEncoding ? SRGBColorSpace : LinearSRGBColorSpace;


        }


        get useLegacyLights() { // @deprecated, r155


            console.warn( 'THREE.WebGLRenderer: The property .useLegacyLights has been deprecated. Migrate your lighting according to the following guide: https://discourse.threejs.org/t/updates-to-lighting-in-three-js-r155/53733.' );

            return this._useLegacyLights;


        }


        set useLegacyLights( value ) { // @deprecated, r155


            console.warn( 'THREE.WebGLRenderer: The property .useLegacyLights has been deprecated. Migrate your lighting according to the following guide: https://discourse.threejs.org/t/updates-to-lighting-in-three-js-r155/53733.' );

            this._useLegacyLights = value;


        }


    }


    class WebGL1Renderer extends WebGLRenderer {}


    WebGL1Renderer.prototype.isWebGL1Renderer = true;


    class FogExp2 {


        constructor( color, density = 0.00025 ) {


            this.isFogExp2 = true;


            this.name = '';


            this.color = new Color( color );

            this.density = density;


        }


        clone() {


            return new FogExp2( this.color, this.density );


        }


        toJSON( /* meta */ ) {


            return {

                type: 'FogExp2',

                name: this.name,

                color: this.color.getHex(),

                density: this.density

            };


        }


    }


    class Fog {


        constructor( color, near = 1, far = 1000 ) {


            this.isFog = true;


            this.name = '';


            this.color = new Color( color );


            this.near = near;

            this.far = far;


        }


        clone() {


            return new Fog( this.color, this.near, this.far );


        }


        toJSON( /* meta */ ) {


            return {

                type: 'Fog',

                name: this.name,

                color: this.color.getHex(),

                near: this.near,

                far: this.far

            };


        }


    }


    class Scene extends Object3D {


        constructor() {


            super();


            this.isScene = true;


            this.type = 'Scene';


            this.background = null;

            this.environment = null;

            this.fog = null;


            this.backgroundBlurriness = 0;

            this.backgroundIntensity = 1;


            this.overrideMaterial = null;


            if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {


                __THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'observe', { detail: this } ) );


            }


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            if ( source.background !== null ) this.background = source.background.clone();

            if ( source.environment !== null ) this.environment = source.environment.clone();

            if ( source.fog !== null ) this.fog = source.fog.clone();


            this.backgroundBlurriness = source.backgroundBlurriness;

            this.backgroundIntensity = source.backgroundIntensity;


            if ( source.overrideMaterial !== null ) this.overrideMaterial = source.overrideMaterial.clone();


            this.matrixAutoUpdate = source.matrixAutoUpdate;


            return this;


        }


        toJSON( meta ) {


            const data = super.toJSON( meta );


            if ( this.fog !== null ) data.object.fog = this.fog.toJSON();

            if ( this.backgroundBlurriness > 0 ) data.object.backgroundBlurriness = this.backgroundBlurriness;

            if ( this.backgroundIntensity !== 1 ) data.object.backgroundIntensity = this.backgroundIntensity;


            return data;


        }


    }


    class InterleavedBuffer {


        constructor( array, stride ) {


            this.isInterleavedBuffer = true;


            this.array = array;

            this.stride = stride;

            this.count = array !== undefined ? array.length / stride : 0;


            this.usage = StaticDrawUsage;

            this._updateRange = { offset: 0, count: - 1 };

            this.updateRanges = [];


            this.version = 0;


            this.uuid = generateUUID();


        }


        onUploadCallback() {}


        set needsUpdate( value ) {


            if ( value === true ) this.version ++;


        }


        get updateRange() {


            console.warn( 'THREE.InterleavedBuffer: updateRange() is deprecated and will be removed in r169. Use addUpdateRange() instead.' ); // @deprecated, r159

            return this._updateRange;


        }


        setUsage( value ) {


            this.usage = value;


            return this;


        }


        addUpdateRange( start, count ) {


            this.updateRanges.push( { start, count } );


        }


        clearUpdateRanges() {


            this.updateRanges.length = 0;


        }


        copy( source ) {


            this.array = new source.array.constructor( source.array );

            this.count = source.count;

            this.stride = source.stride;

            this.usage = source.usage;


            return this;


        }


        copyAt( index1, attribute, index2 ) {


            index1 *= this.stride;

            index2 *= attribute.stride;


            for ( let i = 0, l = this.stride; i < l; i ++ ) {


                this.array[ index1 + i ] = attribute.array[ index2 + i ];


            }


            return this;


        }


        set( value, offset = 0 ) {


            this.array.set( value, offset );


            return this;


        }


        clone( data ) {


            if ( data.arrayBuffers === undefined ) {


                data.arrayBuffers = {};


            }


            if ( this.array.buffer._uuid === undefined ) {


                this.array.buffer._uuid = generateUUID();


            }


            if ( data.arrayBuffers[ this.array.buffer._uuid ] === undefined ) {


                data.arrayBuffers[ this.array.buffer._uuid ] = this.array.slice( 0 ).buffer;


            }


            const array = new this.array.constructor( data.arrayBuffers[ this.array.buffer._uuid ] );


            const ib = new this.constructor( array, this.stride );

            ib.setUsage( this.usage );


            return ib;


        }


        onUpload( callback ) {


            this.onUploadCallback = callback;


            return this;


        }


        toJSON( data ) {


            if ( data.arrayBuffers === undefined ) {


                data.arrayBuffers = {};


            }


            // generate UUID for array buffer if necessary


            if ( this.array.buffer._uuid === undefined ) {


                this.array.buffer._uuid = generateUUID();


            }


            if ( data.arrayBuffers[ this.array.buffer._uuid ] === undefined ) {


                data.arrayBuffers[ this.array.buffer._uuid ] = Array.from( new Uint32Array( this.array.buffer ) );


            }


            //


            return {

                uuid: this.uuid,

                buffer: this.array.buffer._uuid,

                type: this.array.constructor.name,

                stride: this.stride

            };


        }


    }


    const _vector$6 = /*@__PURE__*/ new Vector3();


    class InterleavedBufferAttribute {


        constructor( interleavedBuffer, itemSize, offset, normalized = false ) {


            this.isInterleavedBufferAttribute = true;


            this.name = '';


            this.data = interleavedBuffer;

            this.itemSize = itemSize;

            this.offset = offset;


            this.normalized = normalized;


        }


        get count() {


            return this.data.count;


        }


        get array() {


            return this.data.array;


        }


        set needsUpdate( value ) {


            this.data.needsUpdate = value;


        }


        applyMatrix4( m ) {


            for ( let i = 0, l = this.data.count; i < l; i ++ ) {


                _vector$6.fromBufferAttribute( this, i );


                _vector$6.applyMatrix4( m );


                this.setXYZ( i, _vector$6.x, _vector$6.y, _vector$6.z );


            }


            return this;


        }


        applyNormalMatrix( m ) {


            for ( let i = 0, l = this.count; i < l; i ++ ) {


                _vector$6.fromBufferAttribute( this, i );


                _vector$6.applyNormalMatrix( m );


                this.setXYZ( i, _vector$6.x, _vector$6.y, _vector$6.z );


            }


            return this;


        }


        transformDirection( m ) {


            for ( let i = 0, l = this.count; i < l; i ++ ) {


                _vector$6.fromBufferAttribute( this, i );


                _vector$6.transformDirection( m );


                this.setXYZ( i, _vector$6.x, _vector$6.y, _vector$6.z );


            }


            return this;


        }


        setX( index, x ) {


            if ( this.normalized ) x = normalize( x, this.array );


            this.data.array[ index * this.data.stride + this.offset ] = x;


            return this;


        }


        setY( index, y ) {


            if ( this.normalized ) y = normalize( y, this.array );


            this.data.array[ index * this.data.stride + this.offset + 1 ] = y;


            return this;


        }


        setZ( index, z ) {


            if ( this.normalized ) z = normalize( z, this.array );


            this.data.array[ index * this.data.stride + this.offset + 2 ] = z;


            return this;


        }


        setW( index, w ) {


            if ( this.normalized ) w = normalize( w, this.array );


            this.data.array[ index * this.data.stride + this.offset + 3 ] = w;


            return this;


        }


        getX( index ) {


            let x = this.data.array[ index * this.data.stride + this.offset ];


            if ( this.normalized ) x = denormalize( x, this.array );


            return x;


        }


        getY( index ) {


            let y = this.data.array[ index * this.data.stride + this.offset + 1 ];


            if ( this.normalized ) y = denormalize( y, this.array );


            return y;


        }


        getZ( index ) {


            let z = this.data.array[ index * this.data.stride + this.offset + 2 ];


            if ( this.normalized ) z = denormalize( z, this.array );


            return z;


        }


        getW( index ) {


            let w = this.data.array[ index * this.data.stride + this.offset + 3 ];


            if ( this.normalized ) w = denormalize( w, this.array );


            return w;


        }


        setXY( index, x, y ) {


            index = index * this.data.stride + this.offset;


            if ( this.normalized ) {


                x = normalize( x, this.array );

                y = normalize( y, this.array );


            }


            this.data.array[ index + 0 ] = x;

            this.data.array[ index + 1 ] = y;


            return this;


        }


        setXYZ( index, x, y, z ) {


            index = index * this.data.stride + this.offset;


            if ( this.normalized ) {


                x = normalize( x, this.array );

                y = normalize( y, this.array );

                z = normalize( z, this.array );


            }


            this.data.array[ index + 0 ] = x;

            this.data.array[ index + 1 ] = y;

            this.data.array[ index + 2 ] = z;


            return this;


        }


        setXYZW( index, x, y, z, w ) {


            index = index * this.data.stride + this.offset;


            if ( this.normalized ) {


                x = normalize( x, this.array );

                y = normalize( y, this.array );

                z = normalize( z, this.array );

                w = normalize( w, this.array );


            }


            this.data.array[ index + 0 ] = x;

            this.data.array[ index + 1 ] = y;

            this.data.array[ index + 2 ] = z;

            this.data.array[ index + 3 ] = w;


            return this;


        }


        clone( data ) {


            if ( data === undefined ) {


                console.log( 'THREE.InterleavedBufferAttribute.clone(): Cloning an interleaved buffer attribute will de-interleave buffer data.' );


                const array = [];


                for ( let i = 0; i < this.count; i ++ ) {


                    const index = i * this.data.stride + this.offset;


                    for ( let j = 0; j < this.itemSize; j ++ ) {


                        array.push( this.data.array[ index + j ] );


                    }


                }


                return new BufferAttribute( new this.array.constructor( array ), this.itemSize, this.normalized );


            } else {


                if ( data.interleavedBuffers === undefined ) {


                    data.interleavedBuffers = {};


                }


                if ( data.interleavedBuffers[ this.data.uuid ] === undefined ) {


                    data.interleavedBuffers[ this.data.uuid ] = this.data.clone( data );


                }


                return new InterleavedBufferAttribute( data.interleavedBuffers[ this.data.uuid ], this.itemSize, this.offset, this.normalized );


            }


        }


        toJSON( data ) {


            if ( data === undefined ) {


                console.log( 'THREE.InterleavedBufferAttribute.toJSON(): Serializing an interleaved buffer attribute will de-interleave buffer data.' );


                const array = [];


                for ( let i = 0; i < this.count; i ++ ) {


                    const index = i * this.data.stride + this.offset;


                    for ( let j = 0; j < this.itemSize; j ++ ) {


                        array.push( this.data.array[ index + j ] );


                    }


                }


                // de-interleave data and save it as an ordinary buffer attribute for now


                return {

                    itemSize: this.itemSize,

                    type: this.array.constructor.name,

                    array: array,

                    normalized: this.normalized

                };


            } else {


                // save as true interleaved attribute


                if ( data.interleavedBuffers === undefined ) {


                    data.interleavedBuffers = {};


                }


                if ( data.interleavedBuffers[ this.data.uuid ] === undefined ) {


                    data.interleavedBuffers[ this.data.uuid ] = this.data.toJSON( data );


                }


                return {

                    isInterleavedBufferAttribute: true,

                    itemSize: this.itemSize,

                    data: this.data.uuid,

                    offset: this.offset,

                    normalized: this.normalized

                };


            }


        }


    }


    class SpriteMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isSpriteMaterial = true;


            this.type = 'SpriteMaterial';


            this.color = new Color( 0xffffff );


            this.map = null;


            this.alphaMap = null;


            this.rotation = 0;


            this.sizeAttenuation = true;


            this.transparent = true;


            this.fog = true;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.color.copy( source.color );


            this.map = source.map;


            this.alphaMap = source.alphaMap;


            this.rotation = source.rotation;


            this.sizeAttenuation = source.sizeAttenuation;


            this.fog = source.fog;


            return this;


        }


    }


    let _geometry;


    const _intersectPoint = /*@__PURE__*/ new Vector3();

    const _worldScale = /*@__PURE__*/ new Vector3();

    const _mvPosition = /*@__PURE__*/ new Vector3();


    const _alignedPosition = /*@__PURE__*/ new Vector2();

    const _rotatedPosition = /*@__PURE__*/ new Vector2();

    const _viewWorldMatrix = /*@__PURE__*/ new Matrix4();


    const _vA = /*@__PURE__*/ new Vector3();

    const _vB = /*@__PURE__*/ new Vector3();

    const _vC = /*@__PURE__*/ new Vector3();


    const _uvA = /*@__PURE__*/ new Vector2();

    const _uvB = /*@__PURE__*/ new Vector2();

    const _uvC = /*@__PURE__*/ new Vector2();


    class Sprite extends Object3D {


        constructor( material = new SpriteMaterial() ) {


            super();


            this.isSprite = true;


            this.type = 'Sprite';


            if ( _geometry === undefined ) {


                _geometry = new BufferGeometry();


                const float32Array = new Float32Array( [

                    - 0.5, - 0.5, 0, 0, 0,

                    0.5, - 0.5, 0, 1, 0,

                    0.5, 0.5, 0, 1, 1,

                    - 0.5, 0.5, 0, 0, 1

                ] );


                const interleavedBuffer = new InterleavedBuffer( float32Array, 5 );


                _geometry.setIndex( [ 0, 1, 2,  0, 2, 3 ] );

                _geometry.setAttribute( 'position', new InterleavedBufferAttribute( interleavedBuffer, 3, 0, false ) );

                _geometry.setAttribute( 'uv', new InterleavedBufferAttribute( interleavedBuffer, 2, 3, false ) );


            }


            this.geometry = _geometry;

            this.material = material;


            this.center = new Vector2( 0.5, 0.5 );


        }


        raycast( raycaster, intersects ) {


            if ( raycaster.camera === null ) {


                console.error( 'THREE.Sprite: "Raycaster.camera" needs to be set in order to raycast against sprites.' );


            }


            _worldScale.setFromMatrixScale( this.matrixWorld );


            _viewWorldMatrix.copy( raycaster.camera.matrixWorld );

            this.modelViewMatrix.multiplyMatrices( raycaster.camera.matrixWorldInverse, this.matrixWorld );


            _mvPosition.setFromMatrixPosition( this.modelViewMatrix );


            if ( raycaster.camera.isPerspectiveCamera && this.material.sizeAttenuation === false ) {


                _worldScale.multiplyScalar( - _mvPosition.z );


            }


            const rotation = this.material.rotation;

            let sin, cos;


            if ( rotation !== 0 ) {


                cos = Math.cos( rotation );

                sin = Math.sin( rotation );


            }


            const center = this.center;


            transformVertex( _vA.set( - 0.5, - 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );

            transformVertex( _vB.set( 0.5, - 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );

            transformVertex( _vC.set( 0.5, 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );


            _uvA.set( 0, 0 );

            _uvB.set( 1, 0 );

            _uvC.set( 1, 1 );


            // check first triangle

            let intersect = raycaster.ray.intersectTriangle( _vA, _vB, _vC, false, _intersectPoint );


            if ( intersect === null ) {


                // check second triangle

                transformVertex( _vB.set( - 0.5, 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );

                _uvB.set( 0, 1 );


                intersect = raycaster.ray.intersectTriangle( _vA, _vC, _vB, false, _intersectPoint );

                if ( intersect === null ) {


                    return;


                }


            }


            const distance = raycaster.ray.origin.distanceTo( _intersectPoint );


            if ( distance < raycaster.near || distance > raycaster.far ) return;


            intersects.push( {


                distance: distance,

                point: _intersectPoint.clone(),

                uv: Triangle.getInterpolation( _intersectPoint, _vA, _vB, _vC, _uvA, _uvB, _uvC, new Vector2() ),

                face: null,

                object: this


            } );


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            if ( source.center !== undefined ) this.center.copy( source.center );


            this.material = source.material;


            return this;


        }


    }


    function transformVertex( vertexPosition, mvPosition, center, scale, sin, cos ) {


        // compute position in camera space

        _alignedPosition.subVectors( vertexPosition, center ).addScalar( 0.5 ).multiply( scale );


        // to check if rotation is not zero

        if ( sin !== undefined ) {


            _rotatedPosition.x = ( cos * _alignedPosition.x ) - ( sin * _alignedPosition.y );

            _rotatedPosition.y = ( sin * _alignedPosition.x ) + ( cos * _alignedPosition.y );


        } else {


            _rotatedPosition.copy( _alignedPosition );


        }


        vertexPosition.copy( mvPosition );

        vertexPosition.x += _rotatedPosition.x;

        vertexPosition.y += _rotatedPosition.y;


        // transform to world space

        vertexPosition.applyMatrix4( _viewWorldMatrix );


    }


    const _v1$2 = /*@__PURE__*/ new Vector3();

    const _v2$1 = /*@__PURE__*/ new Vector3();


    class LOD extends Object3D {


        constructor() {


            super();


            this._currentLevel = 0;


            this.type = 'LOD';


            Object.defineProperties( this, {

                levels: {

                    enumerable: true,

                    value: []

                },

                isLOD: {

                    value: true,

                }

            } );


            this.autoUpdate = true;


        }


        copy( source ) {


            super.copy( source, false );


            const levels = source.levels;


            for ( let i = 0, l = levels.length; i < l; i ++ ) {


                const level = levels[ i ];


                this.addLevel( level.object.clone(), level.distance, level.hysteresis );


            }


            this.autoUpdate = source.autoUpdate;


            return this;


        }


        addLevel( object, distance = 0, hysteresis = 0 ) {


            distance = Math.abs( distance );


            const levels = this.levels;


            let l;


            for ( l = 0; l < levels.length; l ++ ) {


                if ( distance < levels[ l ].distance ) {


                    break;


                }


            }


            levels.splice( l, 0, { distance: distance, hysteresis: hysteresis, object: object } );


            this.add( object );


            return this;


        }


        getCurrentLevel() {


            return this._currentLevel;


        }


        getObjectForDistance( distance ) {


            const levels = this.levels;


            if ( levels.length > 0 ) {


                let i, l;


                for ( i = 1, l = levels.length; i < l; i ++ ) {


                    let levelDistance = levels[ i ].distance;


                    if ( levels[ i ].object.visible ) {


                        levelDistance -= levelDistance * levels[ i ].hysteresis;


                    }


                    if ( distance < levelDistance ) {


                        break;


                    }


                }


                return levels[ i - 1 ].object;


            }


            return null;


        }


        raycast( raycaster, intersects ) {


            const levels = this.levels;


            if ( levels.length > 0 ) {


                _v1$2.setFromMatrixPosition( this.matrixWorld );


                const distance = raycaster.ray.origin.distanceTo( _v1$2 );


                this.getObjectForDistance( distance ).raycast( raycaster, intersects );


            }


        }


        update( camera ) {


            const levels = this.levels;


            if ( levels.length > 1 ) {


                _v1$2.setFromMatrixPosition( camera.matrixWorld );

                _v2$1.setFromMatrixPosition( this.matrixWorld );


                const distance = _v1$2.distanceTo( _v2$1 ) / camera.zoom;


                levels[ 0 ].object.visible = true;


                let i, l;


                for ( i = 1, l = levels.length; i < l; i ++ ) {


                    let levelDistance = levels[ i ].distance;


                    if ( levels[ i ].object.visible ) {


                        levelDistance -= levelDistance * levels[ i ].hysteresis;


                    }


                    if ( distance >= levelDistance ) {


                        levels[ i - 1 ].object.visible = false;

                        levels[ i ].object.visible = true;


                    } else {


                        break;


                    }


                }


                this._currentLevel = i - 1;


                for ( ; i < l; i ++ ) {


                    levels[ i ].object.visible = false;


                }


            }


        }


        toJSON( meta ) {


            const data = super.toJSON( meta );


            if ( this.autoUpdate === false ) data.object.autoUpdate = false;


            data.object.levels = [];


            const levels = this.levels;


            for ( let i = 0, l = levels.length; i < l; i ++ ) {


                const level = levels[ i ];


                data.object.levels.push( {

                    object: level.object.uuid,

                    distance: level.distance,

                    hysteresis: level.hysteresis

                } );


            }


            return data;


        }


    }


    const _basePosition = /*@__PURE__*/ new Vector3();


    const _skinIndex = /*@__PURE__*/ new Vector4();

    const _skinWeight = /*@__PURE__*/ new Vector4();


    const _vector3 = /*@__PURE__*/ new Vector3();

    const _matrix4 = /*@__PURE__*/ new Matrix4();

    const _vertex = /*@__PURE__*/ new Vector3();


    const _sphere$4 = /*@__PURE__*/ new Sphere();

    const _inverseMatrix$2 = /*@__PURE__*/ new Matrix4();

    const _ray$2 = /*@__PURE__*/ new Ray();


    class SkinnedMesh extends Mesh {


        constructor( geometry, material ) {


            super( geometry, material );


            this.isSkinnedMesh = true;


            this.type = 'SkinnedMesh';


            this.bindMode = AttachedBindMode;

            this.bindMatrix = new Matrix4();

            this.bindMatrixInverse = new Matrix4();


            this.boundingBox = null;

            this.boundingSphere = null;


        }


        computeBoundingBox() {


            const geometry = this.geometry;


            if ( this.boundingBox === null ) {


                this.boundingBox = new Box3();


            }


            this.boundingBox.makeEmpty();


            const positionAttribute = geometry.getAttribute( 'position' );


            for ( let i = 0; i < positionAttribute.count; i ++ ) {


                this.getVertexPosition( i, _vertex );

                this.boundingBox.expandByPoint( _vertex );


            }


        }


        computeBoundingSphere() {


            const geometry = this.geometry;


            if ( this.boundingSphere === null ) {


                this.boundingSphere = new Sphere();


            }


            this.boundingSphere.makeEmpty();


            const positionAttribute = geometry.getAttribute( 'position' );


            for ( let i = 0; i < positionAttribute.count; i ++ ) {


                this.getVertexPosition( i, _vertex );

                this.boundingSphere.expandByPoint( _vertex );


            }


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.bindMode = source.bindMode;

            this.bindMatrix.copy( source.bindMatrix );

            this.bindMatrixInverse.copy( source.bindMatrixInverse );


            this.skeleton = source.skeleton;


            if ( source.boundingBox !== null ) this.boundingBox = source.boundingBox.clone();

            if ( source.boundingSphere !== null ) this.boundingSphere = source.boundingSphere.clone();


            return this;


        }


        raycast( raycaster, intersects ) {


            const material = this.material;

            const matrixWorld = this.matrixWorld;


            if ( material === undefined ) return;


            // test with bounding sphere in world space


            if ( this.boundingSphere === null ) this.computeBoundingSphere();


            _sphere$4.copy( this.boundingSphere );

            _sphere$4.applyMatrix4( matrixWorld );


            if ( raycaster.ray.intersectsSphere( _sphere$4 ) === false ) return;


            // convert ray to local space of skinned mesh


            _inverseMatrix$2.copy( matrixWorld ).invert();

            _ray$2.copy( raycaster.ray ).applyMatrix4( _inverseMatrix$2 );


            // test with bounding box in local space


            if ( this.boundingBox !== null ) {


                if ( _ray$2.intersectsBox( this.boundingBox ) === false ) return;


            }


            // test for intersections with geometry


            this._computeIntersections( raycaster, intersects, _ray$2 );


        }


        getVertexPosition( index, target ) {


            super.getVertexPosition( index, target );


            this.applyBoneTransform( index, target );


            return target;


        }


        bind( skeleton, bindMatrix ) {


            this.skeleton = skeleton;


            if ( bindMatrix === undefined ) {


                this.updateMatrixWorld( true );


                this.skeleton.calculateInverses();


                bindMatrix = this.matrixWorld;


            }


            this.bindMatrix.copy( bindMatrix );

            this.bindMatrixInverse.copy( bindMatrix ).invert();


        }


        pose() {


            this.skeleton.pose();


        }


        normalizeSkinWeights() {


            const vector = new Vector4();


            const skinWeight = this.geometry.attributes.skinWeight;


            for ( let i = 0, l = skinWeight.count; i < l; i ++ ) {


                vector.fromBufferAttribute( skinWeight, i );


                const scale = 1.0 / vector.manhattanLength();


                if ( scale !== Infinity ) {


                    vector.multiplyScalar( scale );


                } else {


                    vector.set( 1, 0, 0, 0 ); // do something reasonable


                }


                skinWeight.setXYZW( i, vector.x, vector.y, vector.z, vector.w );


            }


        }


        updateMatrixWorld( force ) {


            super.updateMatrixWorld( force );


            if ( this.bindMode === AttachedBindMode ) {


                this.bindMatrixInverse.copy( this.matrixWorld ).invert();


            } else if ( this.bindMode === DetachedBindMode ) {


                this.bindMatrixInverse.copy( this.bindMatrix ).invert();


            } else {


                console.warn( 'THREE.SkinnedMesh: Unrecognized bindMode: ' + this.bindMode );


            }


        }


        applyBoneTransform( index, vector ) {


            const skeleton = this.skeleton;

            const geometry = this.geometry;


            _skinIndex.fromBufferAttribute( geometry.attributes.skinIndex, index );

            _skinWeight.fromBufferAttribute( geometry.attributes.skinWeight, index );


            _basePosition.copy( vector ).applyMatrix4( this.bindMatrix );


            vector.set( 0, 0, 0 );


            for ( let i = 0; i < 4; i ++ ) {


                const weight = _skinWeight.getComponent( i );


                if ( weight !== 0 ) {


                    const boneIndex = _skinIndex.getComponent( i );


                    _matrix4.multiplyMatrices( skeleton.bones[ boneIndex ].matrixWorld, skeleton.boneInverses[ boneIndex ] );


                    vector.addScaledVector( _vector3.copy( _basePosition ).applyMatrix4( _matrix4 ), weight );


                }


            }


            return vector.applyMatrix4( this.bindMatrixInverse );


        }


        boneTransform( index, vector ) { // @deprecated, r151


            console.warn( 'THREE.SkinnedMesh: .boneTransform() was renamed to .applyBoneTransform() in r151.' );

            return this.applyBoneTransform( index, vector );


        }


    }


    class Bone extends Object3D {


        constructor() {


            super();


            this.isBone = true;


            this.type = 'Bone';


        }


    }


    class DataTexture extends Texture {


        constructor( data = null, width = 1, height = 1, format, type, mapping, wrapS, wrapT, magFilter = NearestFilter, minFilter = NearestFilter, anisotropy, colorSpace ) {


            super( null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, colorSpace );


            this.isDataTexture = true;


            this.image = { data: data, width: width, height: height };


            this.generateMipmaps = false;

            this.flipY = false;

            this.unpackAlignment = 1;


        }


    }


    const _offsetMatrix = /*@__PURE__*/ new Matrix4();

    const _identityMatrix$1 = /*@__PURE__*/ new Matrix4();


    class Skeleton {


        constructor( bones = [], boneInverses = [] ) {


            this.uuid = generateUUID();


            this.bones = bones.slice( 0 );

            this.boneInverses = boneInverses;

            this.boneMatrices = null;


            this.boneTexture = null;


            this.init();


        }


        init() {


            const bones = this.bones;

            const boneInverses = this.boneInverses;


            this.boneMatrices = new Float32Array( bones.length * 16 );


            // calculate inverse bone matrices if necessary


            if ( boneInverses.length === 0 ) {


                this.calculateInverses();


            } else {


                // handle special case


                if ( bones.length !== boneInverses.length ) {


                    console.warn( 'THREE.Skeleton: Number of inverse bone matrices does not match amount of bones.' );


                    this.boneInverses = [];


                    for ( let i = 0, il = this.bones.length; i < il; i ++ ) {


                        this.boneInverses.push( new Matrix4() );


                    }


                }


            }


        }


        calculateInverses() {


            this.boneInverses.length = 0;


            for ( let i = 0, il = this.bones.length; i < il; i ++ ) {


                const inverse = new Matrix4();


                if ( this.bones[ i ] ) {


                    inverse.copy( this.bones[ i ].matrixWorld ).invert();


                }


                this.boneInverses.push( inverse );


            }


        }


        pose() {


            // recover the bind-time world matrices


            for ( let i = 0, il = this.bones.length; i < il; i ++ ) {


                const bone = this.bones[ i ];


                if ( bone ) {


                    bone.matrixWorld.copy( this.boneInverses[ i ] ).invert();


                }


            }


            // compute the local matrices, positions, rotations and scales


            for ( let i = 0, il = this.bones.length; i < il; i ++ ) {


                const bone = this.bones[ i ];


                if ( bone ) {


                    if ( bone.parent && bone.parent.isBone ) {


                        bone.matrix.copy( bone.parent.matrixWorld ).invert();

                        bone.matrix.multiply( bone.matrixWorld );


                    } else {


                        bone.matrix.copy( bone.matrixWorld );


                    }


                    bone.matrix.decompose( bone.position, bone.quaternion, bone.scale );


                }


            }


        }


        update() {


            const bones = this.bones;

            const boneInverses = this.boneInverses;

            const boneMatrices = this.boneMatrices;

            const boneTexture = this.boneTexture;


            // flatten bone matrices to array


            for ( let i = 0, il = bones.length; i < il; i ++ ) {


                // compute the offset between the current and the original transform


                const matrix = bones[ i ] ? bones[ i ].matrixWorld : _identityMatrix$1;


                _offsetMatrix.multiplyMatrices( matrix, boneInverses[ i ] );

                _offsetMatrix.toArray( boneMatrices, i * 16 );


            }


            if ( boneTexture !== null ) {


                boneTexture.needsUpdate = true;


            }


        }


        clone() {


            return new Skeleton( this.bones, this.boneInverses );


        }


        computeBoneTexture() {


            // layout (1 matrix = 4 pixels)

            //      RGBA RGBA RGBA RGBA (=> column1, column2, column3, column4)

            //  with  8x8  pixel texture max   16 bones * 4 pixels =  (8 * 8)

            //       16x16 pixel texture max   64 bones * 4 pixels = (16 * 16)

            //       32x32 pixel texture max  256 bones * 4 pixels = (32 * 32)

            //       64x64 pixel texture max 1024 bones * 4 pixels = (64 * 64)


            let size = Math.sqrt( this.bones.length * 4 ); // 4 pixels needed for 1 matrix

            size = Math.ceil( size / 4 ) * 4;

            size = Math.max( size, 4 );


            const boneMatrices = new Float32Array( size * size * 4 ); // 4 floats per RGBA pixel

            boneMatrices.set( this.boneMatrices ); // copy current values


            const boneTexture = new DataTexture( boneMatrices, size, size, RGBAFormat, FloatType );

            boneTexture.needsUpdate = true;


            this.boneMatrices = boneMatrices;

            this.boneTexture = boneTexture;


            return this;


        }


        getBoneByName( name ) {


            for ( let i = 0, il = this.bones.length; i < il; i ++ ) {


                const bone = this.bones[ i ];


                if ( bone.name === name ) {


                    return bone;


                }


            }


            return undefined;


        }


        dispose( ) {


            if ( this.boneTexture !== null ) {


                this.boneTexture.dispose();


                this.boneTexture = null;


            }


        }


        fromJSON( json, bones ) {


            this.uuid = json.uuid;


            for ( let i = 0, l = json.bones.length; i < l; i ++ ) {


                const uuid = json.bones[ i ];

                let bone = bones[ uuid ];


                if ( bone === undefined ) {


                    console.warn( 'THREE.Skeleton: No bone found with UUID:', uuid );

                    bone = new Bone();


                }


                this.bones.push( bone );

                this.boneInverses.push( new Matrix4().fromArray( json.boneInverses[ i ] ) );


            }


            this.init();


            return this;


        }


        toJSON() {


            const data = {

                metadata: {

                    version: 4.6,

                    type: 'Skeleton',

                    generator: 'Skeleton.toJSON'

                },

                bones: [],

                boneInverses: []

            };


            data.uuid = this.uuid;


            const bones = this.bones;

            const boneInverses = this.boneInverses;


            for ( let i = 0, l = bones.length; i < l; i ++ ) {


                const bone = bones[ i ];

                data.bones.push( bone.uuid );


                const boneInverse = boneInverses[ i ];

                data.boneInverses.push( boneInverse.toArray() );


            }


            return data;


        }


    }


    class InstancedBufferAttribute extends BufferAttribute {


        constructor( array, itemSize, normalized, meshPerAttribute = 1 ) {


            super( array, itemSize, normalized );


            this.isInstancedBufferAttribute = true;


            this.meshPerAttribute = meshPerAttribute;


        }


        copy( source ) {


            super.copy( source );


            this.meshPerAttribute = source.meshPerAttribute;


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.meshPerAttribute = this.meshPerAttribute;


            data.isInstancedBufferAttribute = true;


            return data;


        }


    }


    const _instanceLocalMatrix = /*@__PURE__*/ new Matrix4();

    const _instanceWorldMatrix = /*@__PURE__*/ new Matrix4();


    const _instanceIntersects = [];


    const _box3 = /*@__PURE__*/ new Box3();

    const _identity = /*@__PURE__*/ new Matrix4();

    const _mesh$1 = /*@__PURE__*/ new Mesh();

    const _sphere$3 = /*@__PURE__*/ new Sphere();


    class InstancedMesh extends Mesh {


        constructor( geometry, material, count ) {


            super( geometry, material );


            this.isInstancedMesh = true;


            this.instanceMatrix = new InstancedBufferAttribute( new Float32Array( count * 16 ), 16 );

            this.instanceColor = null;


            this.count = count;


            this.boundingBox = null;

            this.boundingSphere = null;


            for ( let i = 0; i < count; i ++ ) {


                this.setMatrixAt( i, _identity );


            }


        }


        computeBoundingBox() {


            const geometry = this.geometry;

            const count = this.count;


            if ( this.boundingBox === null ) {


                this.boundingBox = new Box3();


            }


            if ( geometry.boundingBox === null ) {


                geometry.computeBoundingBox();


            }


            this.boundingBox.makeEmpty();


            for ( let i = 0; i < count; i ++ ) {


                this.getMatrixAt( i, _instanceLocalMatrix );


                _box3.copy( geometry.boundingBox ).applyMatrix4( _instanceLocalMatrix );


                this.boundingBox.union( _box3 );


            }


        }


        computeBoundingSphere() {


            const geometry = this.geometry;

            const count = this.count;


            if ( this.boundingSphere === null ) {


                this.boundingSphere = new Sphere();


            }


            if ( geometry.boundingSphere === null ) {


                geometry.computeBoundingSphere();


            }


            this.boundingSphere.makeEmpty();


            for ( let i = 0; i < count; i ++ ) {


                this.getMatrixAt( i, _instanceLocalMatrix );


                _sphere$3.copy( geometry.boundingSphere ).applyMatrix4( _instanceLocalMatrix );


                this.boundingSphere.union( _sphere$3 );


            }


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.instanceMatrix.copy( source.instanceMatrix );


            if ( source.instanceColor !== null ) this.instanceColor = source.instanceColor.clone();


            this.count = source.count;


            if ( source.boundingBox !== null ) this.boundingBox = source.boundingBox.clone();

            if ( source.boundingSphere !== null ) this.boundingSphere = source.boundingSphere.clone();


            return this;


        }


        getColorAt( index, color ) {


            color.fromArray( this.instanceColor.array, index * 3 );


        }


        getMatrixAt( index, matrix ) {


            matrix.fromArray( this.instanceMatrix.array, index * 16 );


        }


        raycast( raycaster, intersects ) {


            const matrixWorld = this.matrixWorld;

            const raycastTimes = this.count;


            _mesh$1.geometry = this.geometry;

            _mesh$1.material = this.material;


            if ( _mesh$1.material === undefined ) return;


            // test with bounding sphere first


            if ( this.boundingSphere === null ) this.computeBoundingSphere();


            _sphere$3.copy( this.boundingSphere );

            _sphere$3.applyMatrix4( matrixWorld );


            if ( raycaster.ray.intersectsSphere( _sphere$3 ) === false ) return;


            // now test each instance


            for ( let instanceId = 0; instanceId < raycastTimes; instanceId ++ ) {


                // calculate the world matrix for each instance


                this.getMatrixAt( instanceId, _instanceLocalMatrix );


                _instanceWorldMatrix.multiplyMatrices( matrixWorld, _instanceLocalMatrix );


                // the mesh represents this single instance


                _mesh$1.matrixWorld = _instanceWorldMatrix;


                _mesh$1.raycast( raycaster, _instanceIntersects );


                // process the result of raycast


                for ( let i = 0, l = _instanceIntersects.length; i < l; i ++ ) {


                    const intersect = _instanceIntersects[ i ];

                    intersect.instanceId = instanceId;

                    intersect.object = this;

                    intersects.push( intersect );


                }


                _instanceIntersects.length = 0;


            }


        }


        setColorAt( index, color ) {


            if ( this.instanceColor === null ) {


                this.instanceColor = new InstancedBufferAttribute( new Float32Array( this.instanceMatrix.count * 3 ), 3 );


            }


            color.toArray( this.instanceColor.array, index * 3 );


        }


        setMatrixAt( index, matrix ) {


            matrix.toArray( this.instanceMatrix.array, index * 16 );


        }


        updateMorphTargets() {


        }


        dispose() {


            this.dispatchEvent( { type: 'dispose' } );


        }


    }


    function sortOpaque( a, b ) {


        return a.z - b.z;


    }


    function sortTransparent( a, b ) {


        return b.z - a.z;


    }


    class MultiDrawRenderList {


        constructor() {


            this.index = 0;

            this.pool = [];

            this.list = [];


        }


        push( drawRange, z ) {


            const pool = this.pool;

            const list = this.list;

            if ( this.index >= pool.length ) {


                pool.push( {


                    start: - 1,

                    count: - 1,

                    z: - 1,


                } );


            }


            const item = pool[ this.index ];

            list.push( item );

            this.index ++;


            item.start = drawRange.start;

            item.count = drawRange.count;

            item.z = z;


        }


        reset() {


            this.list.length = 0;

            this.index = 0;


        }


    }


    const ID_ATTR_NAME = 'batchId';

    const _matrix = /*@__PURE__*/ new Matrix4();

    const _invMatrixWorld = /*@__PURE__*/ new Matrix4();

    const _identityMatrix = /*@__PURE__*/ new Matrix4();

    const _projScreenMatrix$2 = /*@__PURE__*/ new Matrix4();

    const _frustum = /*@__PURE__*/ new Frustum();

    const _box$1 = /*@__PURE__*/ new Box3();

    const _sphere$2 = /*@__PURE__*/ new Sphere();

    const _vector$5 = /*@__PURE__*/ new Vector3();

    const _renderList = /*@__PURE__*/ new MultiDrawRenderList();

    const _mesh = /*@__PURE__*/ new Mesh();

    const _batchIntersects = [];


    // @TODO: SkinnedMesh support?

    // @TODO: geometry.groups support?

    // @TODO: geometry.drawRange support?

    // @TODO: geometry.morphAttributes support?

    // @TODO: Support uniform parameter per geometry

    // @TODO: Add an "optimize" function to pack geometry and remove data gaps


    // copies data from attribute "src" into "target" starting at "targetOffset"

    function copyAttributeData( src, target, targetOffset = 0 ) {


        const itemSize = target.itemSize;

        if ( src.isInterleavedBufferAttribute || src.array.constructor !== target.array.constructor ) {


            // use the component getters and setters if the array data cannot

            // be copied directly

            const vertexCount = src.count;

            for ( let i = 0; i < vertexCount; i ++ ) {


                for ( let c = 0; c < itemSize; c ++ ) {


                    target.setComponent( i + targetOffset, c, src.getComponent( i, c ) );


                }


            }


        } else {


            // faster copy approach using typed array set function

            target.array.set( src.array, targetOffset * itemSize );


        }


        target.needsUpdate = true;


    }


    class BatchedMesh extends Mesh {


        get maxGeometryCount() {


            return this._maxGeometryCount;


        }


        constructor( maxGeometryCount, maxVertexCount, maxIndexCount = maxVertexCount * 2, material ) {


            super( new BufferGeometry(), material );


            this.isBatchedMesh = true;

            this.perObjectFrustumCulled = true;

            this.sortObjects = true;

            this.boundingBox = null;

            this.boundingSphere = null;

            this.customSort = null;


            this._drawRanges = [];

            this._reservedRanges = [];


            this._visibility = [];

            this._active = [];

            this._bounds = [];


            this._maxGeometryCount = maxGeometryCount;

            this._maxVertexCount = maxVertexCount;

            this._maxIndexCount = maxIndexCount;


            this._geometryInitialized = false;

            this._geometryCount = 0;

            this._multiDrawCounts = new Int32Array( maxGeometryCount );

            this._multiDrawStarts = new Int32Array( maxGeometryCount );

            this._multiDrawCount = 0;

            this._visibilityChanged = true;


            // Local matrix per geometry by using data texture

            this._matricesTexture = null;


            this._initMatricesTexture();


        }


        _initMatricesTexture() {


            // layout (1 matrix = 4 pixels)

            //      RGBA RGBA RGBA RGBA (=> column1, column2, column3, column4)

            //  with  8x8  pixel texture max   16 matrices * 4 pixels =  (8 * 8)

            //       16x16 pixel texture max   64 matrices * 4 pixels = (16 * 16)

            //       32x32 pixel texture max  256 matrices * 4 pixels = (32 * 32)

            //       64x64 pixel texture max 1024 matrices * 4 pixels = (64 * 64)


            let size = Math.sqrt( this._maxGeometryCount * 4 ); // 4 pixels needed for 1 matrix

            size = Math.ceil( size / 4 ) * 4;

            size = Math.max( size, 4 );


            const matricesArray = new Float32Array( size * size * 4 ); // 4 floats per RGBA pixel

            const matricesTexture = new DataTexture( matricesArray, size, size, RGBAFormat, FloatType );


            this._matricesTexture = matricesTexture;


        }


        _initializeGeometry( reference ) {


            const geometry = this.geometry;

            const maxVertexCount = this._maxVertexCount;

            const maxGeometryCount = this._maxGeometryCount;

            const maxIndexCount = this._maxIndexCount;

            if ( this._geometryInitialized === false ) {


                for ( const attributeName in reference.attributes ) {


                    const srcAttribute = reference.getAttribute( attributeName );

                    const { array, itemSize, normalized } = srcAttribute;


                    const dstArray = new array.constructor( maxVertexCount * itemSize );

                    const dstAttribute = new srcAttribute.constructor( dstArray, itemSize, normalized );

                    dstAttribute.setUsage( srcAttribute.usage );


                    geometry.setAttribute( attributeName, dstAttribute );


                }


                if ( reference.getIndex() !== null ) {


                    const indexArray = maxVertexCount > 65536

                        ? new Uint32Array( maxIndexCount )

                        : new Uint16Array( maxIndexCount );


                    geometry.setIndex( new BufferAttribute( indexArray, 1 ) );


                }


                const idArray = maxGeometryCount > 65536

                    ? new Uint32Array( maxVertexCount )

                    : new Uint16Array( maxVertexCount );

                geometry.setAttribute( ID_ATTR_NAME, new BufferAttribute( idArray, 1 ) );


                this._geometryInitialized = true;


            }


        }


        // Make sure the geometry is compatible with the existing combined geometry atributes

        _validateGeometry( geometry ) {


            // check that the geometry doesn't have a version of our reserved id attribute

            if ( geometry.getAttribute( ID_ATTR_NAME ) ) {


                throw new Error( `BatchedMesh: Geometry cannot use attribute "${ ID_ATTR_NAME }"` );


            }


            // check to ensure the geometries are using consistent attributes and indices

            const batchGeometry = this.geometry;

            if ( Boolean( geometry.getIndex() ) !== Boolean( batchGeometry.getIndex() ) ) {


                throw new Error( 'BatchedMesh: All geometries must consistently have "index".' );


            }


            for ( const attributeName in batchGeometry.attributes ) {


                if ( attributeName === ID_ATTR_NAME ) {


                    continue;


                }


                if ( ! geometry.hasAttribute( attributeName ) ) {


                    throw new Error( `BatchedMesh: Added geometry missing "${ attributeName }". All geometries must have consistent attributes.` );


                }


                const srcAttribute = geometry.getAttribute( attributeName );

                const dstAttribute = batchGeometry.getAttribute( attributeName );

                if ( srcAttribute.itemSize !== dstAttribute.itemSize || srcAttribute.normalized !== dstAttribute.normalized ) {


                    throw new Error( 'BatchedMesh: All attributes must have a consistent itemSize and normalized value.' );


                }


            }


        }


        setCustomSort( func ) {


            this.customSort = func;

            return this;


        }


        computeBoundingBox() {


            if ( this.boundingBox === null ) {


                this.boundingBox = new Box3();


            }


            const geometryCount = this._geometryCount;

            const boundingBox = this.boundingBox;

            const active = this._active;


            boundingBox.makeEmpty();

            for ( let i = 0; i < geometryCount; i ++ ) {


                if ( active[ i ] === false ) continue;


                this.getMatrixAt( i, _matrix );

                this.getBoundingBoxAt( i, _box$1 ).applyMatrix4( _matrix );

                boundingBox.union( _box$1 );


            }


        }


        computeBoundingSphere() {


            if ( this.boundingSphere === null ) {


                this.boundingSphere = new Sphere();


            }


            const geometryCount = this._geometryCount;

            const boundingSphere = this.boundingSphere;

            const active = this._active;


            boundingSphere.makeEmpty();

            for ( let i = 0; i < geometryCount; i ++ ) {


                if ( active[ i ] === false ) continue;


                this.getMatrixAt( i, _matrix );

                this.getBoundingSphereAt( i, _sphere$2 ).applyMatrix4( _matrix );

                boundingSphere.union( _sphere$2 );


            }


        }


        addGeometry( geometry, vertexCount = - 1, indexCount = - 1 ) {


            this._initializeGeometry( geometry );


            this._validateGeometry( geometry );


            // ensure we're not over geometry

            if ( this._geometryCount >= this._maxGeometryCount ) {


                throw new Error( 'BatchedMesh: Maximum geometry count reached.' );


            }


            // get the necessary range fo the geometry

            const reservedRange = {

                vertexStart: - 1,

                vertexCount: - 1,

                indexStart: - 1,

                indexCount: - 1,

            };


            let lastRange = null;

            const reservedRanges = this._reservedRanges;

            const drawRanges = this._drawRanges;

            const bounds = this._bounds;

            if ( this._geometryCount !== 0 ) {


                lastRange = reservedRanges[ reservedRanges.length - 1 ];


            }


            if ( vertexCount === - 1 ) {


                reservedRange.vertexCount = geometry.getAttribute( 'position' ).count;


            } else {


                reservedRange.vertexCount = vertexCount;


            }


            if ( lastRange === null ) {


                reservedRange.vertexStart = 0;


            } else {


                reservedRange.vertexStart = lastRange.vertexStart + lastRange.vertexCount;


            }


            const index = geometry.getIndex();

            const hasIndex = index !== null;

            if ( hasIndex ) {


                if ( indexCount === - 1 ) {


                    reservedRange.indexCount = index.count;


                } else {


                    reservedRange.indexCount = indexCount;


                }


                if ( lastRange === null ) {


                    reservedRange.indexStart = 0;


                } else {


                    reservedRange.indexStart = lastRange.indexStart + lastRange.indexCount;


                }


            }


            if (

                reservedRange.indexStart !== - 1 &&

                reservedRange.indexStart + reservedRange.indexCount > this._maxIndexCount ||

                reservedRange.vertexStart + reservedRange.vertexCount > this._maxVertexCount

            ) {


                throw new Error( 'BatchedMesh: Reserved space request exceeds the maximum buffer size.' );


            }


            const visibility = this._visibility;

            const active = this._active;

            const matricesTexture = this._matricesTexture;

            const matricesArray = this._matricesTexture.image.data;


            // push new visibility states

            visibility.push( true );

            active.push( true );


            // update id

            const geometryId = this._geometryCount;

            this._geometryCount ++;


            // initialize matrix information

            _identityMatrix.toArray( matricesArray, geometryId * 16 );

            matricesTexture.needsUpdate = true;


            // add the reserved range and draw range objects

            reservedRanges.push( reservedRange );

            drawRanges.push( {

                start: hasIndex ? reservedRange.indexStart : reservedRange.vertexStart,

                count: - 1

            } );

            bounds.push( {

                boxInitialized: false,

                box: new Box3(),


                sphereInitialized: false,

                sphere: new Sphere()

            } );


            // set the id for the geometry

            const idAttribute = this.geometry.getAttribute( ID_ATTR_NAME );

            for ( let i = 0; i < reservedRange.vertexCount; i ++ ) {


                idAttribute.setX( reservedRange.vertexStart + i, geometryId );


            }


            idAttribute.needsUpdate = true;


            // update the geometry

            this.setGeometryAt( geometryId, geometry );


            return geometryId;


        }


        setGeometryAt( id, geometry ) {


            if ( id >= this._geometryCount ) {


                throw new Error( 'BatchedMesh: Maximum geometry count reached.' );


            }


            this._validateGeometry( geometry );


            const batchGeometry = this.geometry;

            const hasIndex = batchGeometry.getIndex() !== null;

            const dstIndex = batchGeometry.getIndex();

            const srcIndex = geometry.getIndex();

            const reservedRange = this._reservedRanges[ id ];

            if (

                hasIndex &&

                srcIndex.count > reservedRange.indexCount ||

                geometry.attributes.position.count > reservedRange.vertexCount

            ) {


                throw new Error( 'BatchedMesh: Reserved space not large enough for provided geometry.' );


            }


            // copy geometry over

            const vertexStart = reservedRange.vertexStart;

            const vertexCount = reservedRange.vertexCount;

            for ( const attributeName in batchGeometry.attributes ) {


                if ( attributeName === ID_ATTR_NAME ) {


                    continue;


                }


                // copy attribute data

                const srcAttribute = geometry.getAttribute( attributeName );

                const dstAttribute = batchGeometry.getAttribute( attributeName );

                copyAttributeData( srcAttribute, dstAttribute, vertexStart );


                // fill the rest in with zeroes

                const itemSize = srcAttribute.itemSize;

                for ( let i = srcAttribute.count, l = vertexCount; i < l; i ++ ) {


                    const index = vertexStart + i;

                    for ( let c = 0; c < itemSize; c ++ ) {


                        dstAttribute.setComponent( index, c, 0 );


                    }


                }


                dstAttribute.needsUpdate = true;


            }


            // copy index

            if ( hasIndex ) {


                const indexStart = reservedRange.indexStart;


                // copy index data over

                for ( let i = 0; i < srcIndex.count; i ++ ) {


                    dstIndex.setX( indexStart + i, vertexStart + srcIndex.getX( i ) );


                }


                // fill the rest in with zeroes

                for ( let i = srcIndex.count, l = reservedRange.indexCount; i < l; i ++ ) {


                    dstIndex.setX( indexStart + i, vertexStart );


                }


                dstIndex.needsUpdate = true;


            }


            // store the bounding boxes

            const bound = this._bounds[ id ];

            if ( geometry.boundingBox !== null ) {


                bound.box.copy( geometry.boundingBox );

                bound.boxInitialized = true;


            } else {


                bound.boxInitialized = false;


            }


            if ( geometry.boundingSphere !== null ) {


                bound.sphere.copy( geometry.boundingSphere );

                bound.sphereInitialized = true;


            } else {


                bound.sphereInitialized = false;


            }


            // set drawRange count

            const drawRange = this._drawRanges[ id ];

            const posAttr = geometry.getAttribute( 'position' );

            drawRange.count = hasIndex ? srcIndex.count : posAttr.count;

            this._visibilityChanged = true;


            return id;


        }


        deleteGeometry( geometryId ) {


            // Note: User needs to call optimize() afterward to pack the data.


            const active = this._active;

            if ( geometryId >= active.length || active[ geometryId ] === false ) {


                return this;


            }


            active[ geometryId ] = false;

            this._visibilityChanged = true;


            return this;


        }


        // get bounding box and compute it if it doesn't exist

        getBoundingBoxAt( id, target ) {


            const active = this._active;

            if ( active[ id ] === false ) {


                return this;


            }


            // compute bounding box

            const bound = this._bounds[ id ];

            const box = bound.box;

            const geometry = this.geometry;

            if ( bound.boxInitialized === false ) {


                box.makeEmpty();


                const index = geometry.index;

                const position = geometry.attributes.position;

                const drawRange = this._drawRanges[ id ];

                for ( let i = drawRange.start, l = drawRange.start + drawRange.count; i < l; i ++ ) {


                    let iv = i;

                    if ( index ) {


                        iv = index.getX( iv );


                    }


                    box.expandByPoint( _vector$5.fromBufferAttribute( position, iv ) );


                }


                bound.boxInitialized = true;


            }


            target.copy( box );

            return target;


        }


        // get bounding sphere and compute it if it doesn't exist

        getBoundingSphereAt( id, target ) {


            const active = this._active;

            if ( active[ id ] === false ) {


                return this;


            }


            // compute bounding sphere

            const bound = this._bounds[ id ];

            const sphere = bound.sphere;

            const geometry = this.geometry;

            if ( bound.sphereInitialized === false ) {


                sphere.makeEmpty();


                this.getBoundingBoxAt( id, _box$1 );

                _box$1.getCenter( sphere.center );


                const index = geometry.index;

                const position = geometry.attributes.position;

                const drawRange = this._drawRanges[ id ];


                let maxRadiusSq = 0;

                for ( let i = drawRange.start, l = drawRange.start + drawRange.count; i < l; i ++ ) {


                    let iv = i;

                    if ( index ) {


                        iv = index.getX( iv );


                    }


                    _vector$5.fromBufferAttribute( position, iv );

                    maxRadiusSq = Math.max( maxRadiusSq, sphere.center.distanceToSquared( _vector$5 ) );


                }


                sphere.radius = Math.sqrt( maxRadiusSq );

                bound.sphereInitialized = true;


            }


            target.copy( sphere );

            return target;


        }


        setMatrixAt( geometryId, matrix ) {


            // @TODO: Map geometryId to index of the arrays because

            //        optimize() can make geometryId mismatch the index


            const active = this._active;

            const matricesTexture = this._matricesTexture;

            const matricesArray = this._matricesTexture.image.data;

            const geometryCount = this._geometryCount;

            if ( geometryId >= geometryCount || active[ geometryId ] === false ) {


                return this;


            }


            matrix.toArray( matricesArray, geometryId * 16 );

            matricesTexture.needsUpdate = true;


            return this;


        }


        getMatrixAt( geometryId, matrix ) {


            const active = this._active;

            const matricesArray = this._matricesTexture.image.data;

            const geometryCount = this._geometryCount;

            if ( geometryId >= geometryCount || active[ geometryId ] === false ) {


                return null;


            }


            return matrix.fromArray( matricesArray, geometryId * 16 );


        }


        setVisibleAt( geometryId, value ) {


            const visibility = this._visibility;

            const active = this._active;

            const geometryCount = this._geometryCount;


            // if the geometry is out of range, not active, or visibility state

            // does not change then return early

            if (

                geometryId >= geometryCount ||

                active[ geometryId ] === false ||

                visibility[ geometryId ] === value

            ) {


                return this;


            }


            visibility[ geometryId ] = value;

            this._visibilityChanged = true;


            return this;


        }


        getVisibleAt( geometryId ) {


            const visibility = this._visibility;

            const active = this._active;

            const geometryCount = this._geometryCount;


            // return early if the geometry is out of range or not active

            if ( geometryId >= geometryCount || active[ geometryId ] === false ) {


                return false;


            }


            return visibility[ geometryId ];


        }


        raycast( raycaster, intersects ) {


            const visibility = this._visibility;

            const active = this._active;

            const drawRanges = this._drawRanges;

            const geometryCount = this._geometryCount;

            const matrixWorld = this.matrixWorld;

            const batchGeometry = this.geometry;


            // iterate over each geometry

            _mesh.material = this.material;

            _mesh.geometry.index = batchGeometry.index;

            _mesh.geometry.attributes = batchGeometry.attributes;

            if ( _mesh.geometry.boundingBox === null ) {


                _mesh.geometry.boundingBox = new Box3();


            }


            if ( _mesh.geometry.boundingSphere === null ) {


                _mesh.geometry.boundingSphere = new Sphere();


            }


            for ( let i = 0; i < geometryCount; i ++ ) {


                if ( ! visibility[ i ] || ! active[ i ] ) {


                    continue;


                }


                const drawRange = drawRanges[ i ];

                _mesh.geometry.setDrawRange( drawRange.start, drawRange.count );


                // ge the intersects

                this.getMatrixAt( i, _mesh.matrixWorld ).premultiply( matrixWorld );

                this.getBoundingBoxAt( i, _mesh.geometry.boundingBox );

                this.getBoundingSphereAt( i, _mesh.geometry.boundingSphere );

                _mesh.raycast( raycaster, _batchIntersects );


                // add batch id to the intersects

                for ( let j = 0, l = _batchIntersects.length; j < l; j ++ ) {


                    const intersect = _batchIntersects[ j ];

                    intersect.object = this;

                    intersect.batchId = i;

                    intersects.push( intersect );


                }


                _batchIntersects.length = 0;


            }


            _mesh.material = null;

            _mesh.geometry.index = null;

            _mesh.geometry.attributes = {};

            _mesh.geometry.setDrawRange( 0, Infinity );


        }


        copy( source ) {


            super.copy( source );


            this.geometry = source.geometry.clone();

            this.perObjectFrustumCulled = source.perObjectFrustumCulled;

            this.sortObjects = source.sortObjects;

            this.boundingBox = source.boundingBox !== null ? source.boundingBox.clone() : null;

            this.boundingSphere = source.boundingSphere !== null ? source.boundingSphere.clone() : null;


            this._drawRanges = source._drawRanges.map( range => ( { ...range } ) );

            this._reservedRanges = source._reservedRanges.map( range => ( { ...range } ) );


            this._visibility = source._visibility.slice();

            this._active = source._active.slice();

            this._bounds = source._bounds.map( bound => ( {

                boxInitialized: bound.boxInitialized,

                box: bound.box.clone(),


                sphereInitialized: bound.sphereInitialized,

                sphere: bound.sphere.clone()

            } ) );


            this._maxGeometryCount = source._maxGeometryCount;

            this._maxVertexCount = source._maxVertexCount;

            this._maxIndexCount = source._maxIndexCount;


            this._geometryInitialized = source._geometryInitialized;

            this._geometryCount = source._geometryCount;

            this._multiDrawCounts = source._multiDrawCounts.slice();

            this._multiDrawStarts = source._multiDrawStarts.slice();


            this._matricesTexture = source._matricesTexture.clone();

            this._matricesTexture.image.data = this._matricesTexture.image.slice();


            return this;


        }


        dispose() {


            // Assuming the geometry is not shared with other meshes

            this.geometry.dispose();


            this._matricesTexture.dispose();

            this._matricesTexture = null;

            return this;


        }


        onBeforeRender( renderer, scene, camera, geometry, material/*, _group*/ ) {


            // if visibility has not changed and frustum culling and object sorting is not required

            // then skip iterating over all items

            if ( ! this._visibilityChanged && ! this.perObjectFrustumCulled && ! this.sortObjects ) {


                return;


            }


            // the indexed version of the multi draw function requires specifying the start

            // offset in bytes.

            const index = geometry.getIndex();

            const bytesPerElement = index === null ? 1 : index.array.BYTES_PER_ELEMENT;


            const visibility = this._visibility;

            const multiDrawStarts = this._multiDrawStarts;

            const multiDrawCounts = this._multiDrawCounts;

            const drawRanges = this._drawRanges;

            const perObjectFrustumCulled = this.perObjectFrustumCulled;


            // prepare the frustum in the local frame

            if ( perObjectFrustumCulled ) {


                _projScreenMatrix$2

                    .multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse )

                    .multiply( this.matrixWorld );

                _frustum.setFromProjectionMatrix(

                    _projScreenMatrix$2,

                    renderer.isWebGPURenderer ? WebGPUCoordinateSystem : WebGLCoordinateSystem

                );


            }


            let count = 0;

            if ( this.sortObjects ) {


                // get the camera position in the local frame

                _invMatrixWorld.copy( this.matrixWorld ).invert();

                _vector$5.setFromMatrixPosition( camera.matrixWorld ).applyMatrix4( _invMatrixWorld );


                for ( let i = 0, l = visibility.length; i < l; i ++ ) {


                    if ( visibility[ i ] ) {


                        // get the bounds in world space

                        this.getMatrixAt( i, _matrix );

                        this.getBoundingSphereAt( i, _sphere$2 ).applyMatrix4( _matrix );


                        // determine whether the batched geometry is within the frustum

                        let culled = false;

                        if ( perObjectFrustumCulled ) {


                            culled = ! _frustum.intersectsSphere( _sphere$2 );


                        }


                        if ( ! culled ) {


                            // get the distance from camera used for sorting

                            const z = _vector$5.distanceTo( _sphere$2.center );

                            _renderList.push( drawRanges[ i ], z );


                        }


                    }


                }


                // Sort the draw ranges and prep for rendering

                const list = _renderList.list;

                const customSort = this.customSort;

                if ( customSort === null ) {


                    list.sort( material.transparent ? sortTransparent : sortOpaque );


                } else {


                    customSort.call( this, list, camera );


                }


                for ( let i = 0, l = list.length; i < l; i ++ ) {


                    const item = list[ i ];

                    multiDrawStarts[ count ] = item.start * bytesPerElement;

                    multiDrawCounts[ count ] = item.count;

                    count ++;


                }


                _renderList.reset();


            } else {


                for ( let i = 0, l = visibility.length; i < l; i ++ ) {


                    if ( visibility[ i ] ) {


                        // determine whether the batched geometry is within the frustum

                        let culled = false;

                        if ( perObjectFrustumCulled ) {


                            // get the bounds in world space

                            this.getMatrixAt( i, _matrix );

                            this.getBoundingSphereAt( i, _sphere$2 ).applyMatrix4( _matrix );

                            culled = ! _frustum.intersectsSphere( _sphere$2 );


                        }


                        if ( ! culled ) {


                            const range = drawRanges[ i ];

                            multiDrawStarts[ count ] = range.start * bytesPerElement;

                            multiDrawCounts[ count ] = range.count;

                            count ++;


                        }


                    }


                }


            }


            this._multiDrawCount = count;

            this._visibilityChanged = false;


        }


        onBeforeShadow( renderer, object, camera, shadowCamera, geometry, depthMaterial/* , group */ ) {


            this.onBeforeRender( renderer, null, shadowCamera, geometry, depthMaterial );


        }


    }


    class LineBasicMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isLineBasicMaterial = true;


            this.type = 'LineBasicMaterial';


            this.color = new Color( 0xffffff );


            this.map = null;


            this.linewidth = 1;

            this.linecap = 'round';

            this.linejoin = 'round';


            this.fog = true;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.color.copy( source.color );


            this.map = source.map;


            this.linewidth = source.linewidth;

            this.linecap = source.linecap;

            this.linejoin = source.linejoin;


            this.fog = source.fog;


            return this;


        }


    }


    const _start$1 = /*@__PURE__*/ new Vector3();

    const _end$1 = /*@__PURE__*/ new Vector3();

    const _inverseMatrix$1 = /*@__PURE__*/ new Matrix4();

    const _ray$1 = /*@__PURE__*/ new Ray();

    const _sphere$1 = /*@__PURE__*/ new Sphere();


    class Line extends Object3D {


        constructor( geometry = new BufferGeometry(), material = new LineBasicMaterial() ) {


            super();


            this.isLine = true;


            this.type = 'Line';


            this.geometry = geometry;

            this.material = material;


            this.updateMorphTargets();


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.material = Array.isArray( source.material ) ? source.material.slice() : source.material;

            this.geometry = source.geometry;


            return this;


        }


        computeLineDistances() {


            const geometry = this.geometry;


            // we assume non-indexed geometry


            if ( geometry.index === null ) {


                const positionAttribute = geometry.attributes.position;

                const lineDistances = [ 0 ];


                for ( let i = 1, l = positionAttribute.count; i < l; i ++ ) {


                    _start$1.fromBufferAttribute( positionAttribute, i - 1 );

                    _end$1.fromBufferAttribute( positionAttribute, i );


                    lineDistances[ i ] = lineDistances[ i - 1 ];

                    lineDistances[ i ] += _start$1.distanceTo( _end$1 );


                }


                geometry.setAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) );


            } else {


                console.warn( 'THREE.Line.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' );


            }


            return this;


        }


        raycast( raycaster, intersects ) {


            const geometry = this.geometry;

            const matrixWorld = this.matrixWorld;

            const threshold = raycaster.params.Line.threshold;

            const drawRange = geometry.drawRange;


            // Checking boundingSphere distance to ray


            if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();


            _sphere$1.copy( geometry.boundingSphere );

            _sphere$1.applyMatrix4( matrixWorld );

            _sphere$1.radius += threshold;


            if ( raycaster.ray.intersectsSphere( _sphere$1 ) === false ) return;


            //


            _inverseMatrix$1.copy( matrixWorld ).invert();

            _ray$1.copy( raycaster.ray ).applyMatrix4( _inverseMatrix$1 );


            const localThreshold = threshold / ( ( this.scale.x + this.scale.y + this.scale.z ) / 3 );

            const localThresholdSq = localThreshold * localThreshold;


            const vStart = new Vector3();

            const vEnd = new Vector3();

            const interSegment = new Vector3();

            const interRay = new Vector3();

            const step = this.isLineSegments ? 2 : 1;


            const index = geometry.index;

            const attributes = geometry.attributes;

            const positionAttribute = attributes.position;


            if ( index !== null ) {


                const start = Math.max( 0, drawRange.start );

                const end = Math.min( index.count, ( drawRange.start + drawRange.count ) );


                for ( let i = start, l = end - 1; i < l; i += step ) {


                    const a = index.getX( i );

                    const b = index.getX( i + 1 );


                    vStart.fromBufferAttribute( positionAttribute, a );

                    vEnd.fromBufferAttribute( positionAttribute, b );


                    const distSq = _ray$1.distanceSqToSegment( vStart, vEnd, interRay, interSegment );


                    if ( distSq > localThresholdSq ) continue;


                    interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation


                    const distance = raycaster.ray.origin.distanceTo( interRay );


                    if ( distance < raycaster.near || distance > raycaster.far ) continue;


                    intersects.push( {


                        distance: distance,

                        // What do we want? intersection point on the ray or on the segment??

                        // point: raycaster.ray.at( distance ),

                        point: interSegment.clone().applyMatrix4( this.matrixWorld ),

                        index: i,

                        face: null,

                        faceIndex: null,

                        object: this


                    } );


                }


            } else {


                const start = Math.max( 0, drawRange.start );

                const end = Math.min( positionAttribute.count, ( drawRange.start + drawRange.count ) );


                for ( let i = start, l = end - 1; i < l; i += step ) {


                    vStart.fromBufferAttribute( positionAttribute, i );

                    vEnd.fromBufferAttribute( positionAttribute, i + 1 );


                    const distSq = _ray$1.distanceSqToSegment( vStart, vEnd, interRay, interSegment );


                    if ( distSq > localThresholdSq ) continue;


                    interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation


                    const distance = raycaster.ray.origin.distanceTo( interRay );


                    if ( distance < raycaster.near || distance > raycaster.far ) continue;


                    intersects.push( {


                        distance: distance,

                        // What do we want? intersection point on the ray or on the segment??

                        // point: raycaster.ray.at( distance ),

                        point: interSegment.clone().applyMatrix4( this.matrixWorld ),

                        index: i,

                        face: null,

                        faceIndex: null,

                        object: this


                    } );


                }


            }


        }


        updateMorphTargets() {


            const geometry = this.geometry;


            const morphAttributes = geometry.morphAttributes;

            const keys = Object.keys( morphAttributes );


            if ( keys.length > 0 ) {


                const morphAttribute = morphAttributes[ keys[ 0 ] ];


                if ( morphAttribute !== undefined ) {


                    this.morphTargetInfluences = [];

                    this.morphTargetDictionary = {};


                    for ( let m = 0, ml = morphAttribute.length; m < ml; m ++ ) {


                        const name = morphAttribute[ m ].name || String( m );


                        this.morphTargetInfluences.push( 0 );

                        this.morphTargetDictionary[ name ] = m;


                    }


                }


            }


        }


    }


    const _start = /*@__PURE__*/ new Vector3();

    const _end = /*@__PURE__*/ new Vector3();


    class LineSegments extends Line {


        constructor( geometry, material ) {


            super( geometry, material );


            this.isLineSegments = true;


            this.type = 'LineSegments';


        }


        computeLineDistances() {


            const geometry = this.geometry;


            // we assume non-indexed geometry


            if ( geometry.index === null ) {


                const positionAttribute = geometry.attributes.position;

                const lineDistances = [];


                for ( let i = 0, l = positionAttribute.count; i < l; i += 2 ) {


                    _start.fromBufferAttribute( positionAttribute, i );

                    _end.fromBufferAttribute( positionAttribute, i + 1 );


                    lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ];

                    lineDistances[ i + 1 ] = lineDistances[ i ] + _start.distanceTo( _end );


                }


                geometry.setAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) );


            } else {


                console.warn( 'THREE.LineSegments.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' );


            }


            return this;


        }


    }


    class LineLoop extends Line {


        constructor( geometry, material ) {


            super( geometry, material );


            this.isLineLoop = true;


            this.type = 'LineLoop';


        }


    }


    class PointsMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isPointsMaterial = true;


            this.type = 'PointsMaterial';


            this.color = new Color( 0xffffff );


            this.map = null;


            this.alphaMap = null;


            this.size = 1;

            this.sizeAttenuation = true;


            this.fog = true;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.color.copy( source.color );


            this.map = source.map;


            this.alphaMap = source.alphaMap;


            this.size = source.size;

            this.sizeAttenuation = source.sizeAttenuation;


            this.fog = source.fog;


            return this;


        }


    }


    const _inverseMatrix = /*@__PURE__*/ new Matrix4();

    const _ray = /*@__PURE__*/ new Ray();

    const _sphere = /*@__PURE__*/ new Sphere();

    const _position$2 = /*@__PURE__*/ new Vector3();


    class Points extends Object3D {


        constructor( geometry = new BufferGeometry(), material = new PointsMaterial() ) {


            super();


            this.isPoints = true;


            this.type = 'Points';


            this.geometry = geometry;

            this.material = material;


            this.updateMorphTargets();


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.material = Array.isArray( source.material ) ? source.material.slice() : source.material;

            this.geometry = source.geometry;


            return this;


        }


        raycast( raycaster, intersects ) {


            const geometry = this.geometry;

            const matrixWorld = this.matrixWorld;

            const threshold = raycaster.params.Points.threshold;

            const drawRange = geometry.drawRange;


            // Checking boundingSphere distance to ray


            if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();


            _sphere.copy( geometry.boundingSphere );

            _sphere.applyMatrix4( matrixWorld );

            _sphere.radius += threshold;


            if ( raycaster.ray.intersectsSphere( _sphere ) === false ) return;


            //


            _inverseMatrix.copy( matrixWorld ).invert();

            _ray.copy( raycaster.ray ).applyMatrix4( _inverseMatrix );


            const localThreshold = threshold / ( ( this.scale.x + this.scale.y + this.scale.z ) / 3 );

            const localThresholdSq = localThreshold * localThreshold;


            const index = geometry.index;

            const attributes = geometry.attributes;

            const positionAttribute = attributes.position;


            if ( index !== null ) {


                const start = Math.max( 0, drawRange.start );

                const end = Math.min( index.count, ( drawRange.start + drawRange.count ) );


                for ( let i = start, il = end; i < il; i ++ ) {


                    const a = index.getX( i );


                    _position$2.fromBufferAttribute( positionAttribute, a );


                    testPoint( _position$2, a, localThresholdSq, matrixWorld, raycaster, intersects, this );


                }


            } else {


                const start = Math.max( 0, drawRange.start );

                const end = Math.min( positionAttribute.count, ( drawRange.start + drawRange.count ) );


                for ( let i = start, l = end; i < l; i ++ ) {


                    _position$2.fromBufferAttribute( positionAttribute, i );


                    testPoint( _position$2, i, localThresholdSq, matrixWorld, raycaster, intersects, this );


                }


            }


        }


        updateMorphTargets() {


            const geometry = this.geometry;


            const morphAttributes = geometry.morphAttributes;

            const keys = Object.keys( morphAttributes );


            if ( keys.length > 0 ) {


                const morphAttribute = morphAttributes[ keys[ 0 ] ];


                if ( morphAttribute !== undefined ) {


                    this.morphTargetInfluences = [];

                    this.morphTargetDictionary = {};


                    for ( let m = 0, ml = morphAttribute.length; m < ml; m ++ ) {


                        const name = morphAttribute[ m ].name || String( m );


                        this.morphTargetInfluences.push( 0 );

                        this.morphTargetDictionary[ name ] = m;


                    }


                }


            }


        }


    }


    function testPoint( point, index, localThresholdSq, matrixWorld, raycaster, intersects, object ) {


        const rayPointDistanceSq = _ray.distanceSqToPoint( point );


        if ( rayPointDistanceSq < localThresholdSq ) {


            const intersectPoint = new Vector3();


            _ray.closestPointToPoint( point, intersectPoint );

            intersectPoint.applyMatrix4( matrixWorld );


            const distance = raycaster.ray.origin.distanceTo( intersectPoint );


            if ( distance < raycaster.near || distance > raycaster.far ) return;


            intersects.push( {


                distance: distance,

                distanceToRay: Math.sqrt( rayPointDistanceSq ),

                point: intersectPoint,

                index: index,

                face: null,

                object: object


            } );


        }


    }


    class VideoTexture extends Texture {


        constructor( video, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy ) {


            super( video, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );


            this.isVideoTexture = true;


            this.minFilter = minFilter !== undefined ? minFilter : LinearFilter;

            this.magFilter = magFilter !== undefined ? magFilter : LinearFilter;


            this.generateMipmaps = false;


            const scope = this;


            function updateVideo() {


                scope.needsUpdate = true;

                video.requestVideoFrameCallback( updateVideo );


            }


            if ( 'requestVideoFrameCallback' in video ) {


                video.requestVideoFrameCallback( updateVideo );


            }


        }


        clone() {


            return new this.constructor( this.image ).copy( this );


        }


        update() {


            const video = this.image;

            const hasVideoFrameCallback = 'requestVideoFrameCallback' in video;


            if ( hasVideoFrameCallback === false && video.readyState >= video.HAVE_CURRENT_DATA ) {


                this.needsUpdate = true;


            }


        }


    }


    class FramebufferTexture extends Texture {


        constructor( width, height ) {


            super( { width, height } );


            this.isFramebufferTexture = true;


            this.magFilter = NearestFilter;

            this.minFilter = NearestFilter;


            this.generateMipmaps = false;


            this.needsUpdate = true;


        }


    }


    class CompressedTexture extends Texture {


        constructor( mipmaps, width, height, format, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, colorSpace ) {


            super( null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, colorSpace );


            this.isCompressedTexture = true;


            this.image = { width: width, height: height };

            this.mipmaps = mipmaps;


            // no flipping for cube textures

            // (also flipping doesn't work for compressed textures )


            this.flipY = false;


            // can't generate mipmaps for compressed textures

            // mips must be embedded in DDS files


            this.generateMipmaps = false;


        }


    }


    class CompressedArrayTexture extends CompressedTexture {


        constructor( mipmaps, width, height, depth, format, type ) {


            super( mipmaps, width, height, format, type );


            this.isCompressedArrayTexture = true;

            this.image.depth = depth;

            this.wrapR = ClampToEdgeWrapping;


        }


    }


    class CompressedCubeTexture extends CompressedTexture {


        constructor( images, format, type ) {


            super( undefined, images[ 0 ].width, images[ 0 ].height, format, type, CubeReflectionMapping );


            this.isCompressedCubeTexture = true;

            this.isCubeTexture = true;


            this.image = images;


        }


    }


    class CanvasTexture extends Texture {


        constructor( canvas, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy ) {


            super( canvas, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );


            this.isCanvasTexture = true;


            this.needsUpdate = true;


        }


    }


    class Curve {


        constructor() {


            this.type = 'Curve';


            this.arcLengthDivisions = 200;


        }


        // Virtual base class method to overwrite and implement in subclasses

        //  - t [0 .. 1]


        getPoint( /* t, optionalTarget */ ) {


            console.warn( 'THREE.Curve: .getPoint() not implemented.' );

            return null;


        }


        // Get point at relative position in curve according to arc length

        // - u [0 .. 1]


        getPointAt( u, optionalTarget ) {


            const t = this.getUtoTmapping( u );

            return this.getPoint( t, optionalTarget );


        }


        // Get sequence of points using getPoint( t )


        getPoints( divisions = 5 ) {


            const points = [];


            for ( let d = 0; d <= divisions; d ++ ) {


                points.push( this.getPoint( d / divisions ) );


            }


            return points;


        }


        // Get sequence of points using getPointAt( u )


        getSpacedPoints( divisions = 5 ) {


            const points = [];


            for ( let d = 0; d <= divisions; d ++ ) {


                points.push( this.getPointAt( d / divisions ) );


            }


            return points;


        }


        // Get total curve arc length


        getLength() {


            const lengths = this.getLengths();

            return lengths[ lengths.length - 1 ];


        }


        // Get list of cumulative segment lengths


        getLengths( divisions = this.arcLengthDivisions ) {


            if ( this.cacheArcLengths &&

                ( this.cacheArcLengths.length === divisions + 1 ) &&

                ! this.needsUpdate ) {


                return this.cacheArcLengths;


            }


            this.needsUpdate = false;


            const cache = [];

            let current, last = this.getPoint( 0 );

            let sum = 0;


            cache.push( 0 );


            for ( let p = 1; p <= divisions; p ++ ) {


                current = this.getPoint( p / divisions );

                sum += current.distanceTo( last );

                cache.push( sum );

                last = current;


            }


            this.cacheArcLengths = cache;


            return cache; // { sums: cache, sum: sum }; Sum is in the last element.


        }


        updateArcLengths() {


            this.needsUpdate = true;

            this.getLengths();


        }


        // Given u ( 0 .. 1 ), get a t to find p. This gives you points which are equidistant


        getUtoTmapping( u, distance ) {


            const arcLengths = this.getLengths();


            let i = 0;

            const il = arcLengths.length;


            let targetArcLength; // The targeted u distance value to get


            if ( distance ) {


                targetArcLength = distance;


            } else {


                targetArcLength = u * arcLengths[ il - 1 ];


            }


            // binary search for the index with largest value smaller than target u distance


            let low = 0, high = il - 1, comparison;


            while ( low <= high ) {


                i = Math.floor( low + ( high - low ) / 2 ); // less likely to overflow, though probably not issue here, JS doesn't really have integers, all numbers are floats


                comparison = arcLengths[ i ] - targetArcLength;


                if ( comparison < 0 ) {


                    low = i + 1;


                } else if ( comparison > 0 ) {


                    high = i - 1;


                } else {


                    high = i;

                    break;


                    // DONE


                }


            }


            i = high;


            if ( arcLengths[ i ] === targetArcLength ) {


                return i / ( il - 1 );


            }


            // we could get finer grain at lengths, or use simple interpolation between two points


            const lengthBefore = arcLengths[ i ];

            const lengthAfter = arcLengths[ i + 1 ];


            const segmentLength = lengthAfter - lengthBefore;


            // determine where we are between the 'before' and 'after' points


            const segmentFraction = ( targetArcLength - lengthBefore ) / segmentLength;


            // add that fractional amount to t


            const t = ( i + segmentFraction ) / ( il - 1 );


            return t;


        }


        // Returns a unit vector tangent at t

        // In case any sub curve does not implement its tangent derivation,

        // 2 points a small delta apart will be used to find its gradient

        // which seems to give a reasonable approximation


        getTangent( t, optionalTarget ) {


            const delta = 0.0001;

            let t1 = t - delta;

            let t2 = t + delta;


            // Capping in case of danger


            if ( t1 < 0 ) t1 = 0;

            if ( t2 > 1 ) t2 = 1;


            const pt1 = this.getPoint( t1 );

            const pt2 = this.getPoint( t2 );


            const tangent = optionalTarget || ( ( pt1.isVector2 ) ? new Vector2() : new Vector3() );


            tangent.copy( pt2 ).sub( pt1 ).normalize();


            return tangent;


        }


        getTangentAt( u, optionalTarget ) {


            const t = this.getUtoTmapping( u );

            return this.getTangent( t, optionalTarget );


        }


        computeFrenetFrames( segments, closed ) {


            // see http://www.cs.indiana.edu/pub/techreports/TR425.pdf


            const normal = new Vector3();


            const tangents = [];

            const normals = [];

            const binormals = [];


            const vec = new Vector3();

            const mat = new Matrix4();


            // compute the tangent vectors for each segment on the curve


            for ( let i = 0; i <= segments; i ++ ) {


                const u = i / segments;


                tangents[ i ] = this.getTangentAt( u, new Vector3() );


            }


            // select an initial normal vector perpendicular to the first tangent vector,

            // and in the direction of the minimum tangent xyz component


            normals[ 0 ] = new Vector3();

            binormals[ 0 ] = new Vector3();

            let min = Number.MAX_VALUE;

            const tx = Math.abs( tangents[ 0 ].x );

            const ty = Math.abs( tangents[ 0 ].y );

            const tz = Math.abs( tangents[ 0 ].z );


            if ( tx <= min ) {


                min = tx;

                normal.set( 1, 0, 0 );


            }


            if ( ty <= min ) {


                min = ty;

                normal.set( 0, 1, 0 );


            }


            if ( tz <= min ) {


                normal.set( 0, 0, 1 );


            }


            vec.crossVectors( tangents[ 0 ], normal ).normalize();


            normals[ 0 ].crossVectors( tangents[ 0 ], vec );

            binormals[ 0 ].crossVectors( tangents[ 0 ], normals[ 0 ] );


            // compute the slowly-varying normal and binormal vectors for each segment on the curve


            for ( let i = 1; i <= segments; i ++ ) {


                normals[ i ] = normals[ i - 1 ].clone();


                binormals[ i ] = binormals[ i - 1 ].clone();


                vec.crossVectors( tangents[ i - 1 ], tangents[ i ] );


                if ( vec.length() > Number.EPSILON ) {


                    vec.normalize();


                    const theta = Math.acos( clamp( tangents[ i - 1 ].dot( tangents[ i ] ), - 1, 1 ) ); // clamp for floating pt errors


                    normals[ i ].applyMatrix4( mat.makeRotationAxis( vec, theta ) );


                }


                binormals[ i ].crossVectors( tangents[ i ], normals[ i ] );


            }


            // if the curve is closed, postprocess the vectors so the first and last normal vectors are the same


            if ( closed === true ) {


                let theta = Math.acos( clamp( normals[ 0 ].dot( normals[ segments ] ), - 1, 1 ) );

                theta /= segments;


                if ( tangents[ 0 ].dot( vec.crossVectors( normals[ 0 ], normals[ segments ] ) ) > 0 ) {


                    theta = - theta;


                }


                for ( let i = 1; i <= segments; i ++ ) {


                    // twist a little...

                    normals[ i ].applyMatrix4( mat.makeRotationAxis( tangents[ i ], theta * i ) );

                    binormals[ i ].crossVectors( tangents[ i ], normals[ i ] );


                }


            }


            return {

                tangents: tangents,

                normals: normals,

                binormals: binormals

            };


        }


        clone() {


            return new this.constructor().copy( this );


        }


        copy( source ) {


            this.arcLengthDivisions = source.arcLengthDivisions;


            return this;


        }


        toJSON() {


            const data = {

                metadata: {

                    version: 4.6,

                    type: 'Curve',

                    generator: 'Curve.toJSON'

                }

            };


            data.arcLengthDivisions = this.arcLengthDivisions;

            data.type = this.type;


            return data;


        }


        fromJSON( json ) {


            this.arcLengthDivisions = json.arcLengthDivisions;


            return this;


        }


    }


    class EllipseCurve extends Curve {


        constructor( aX = 0, aY = 0, xRadius = 1, yRadius = 1, aStartAngle = 0, aEndAngle = Math.PI * 2, aClockwise = false, aRotation = 0 ) {


            super();


            this.isEllipseCurve = true;


            this.type = 'EllipseCurve';


            this.aX = aX;

            this.aY = aY;


            this.xRadius = xRadius;

            this.yRadius = yRadius;


            this.aStartAngle = aStartAngle;

            this.aEndAngle = aEndAngle;


            this.aClockwise = aClockwise;


            this.aRotation = aRotation;


        }


        getPoint( t, optionalTarget ) {


            const point = optionalTarget || new Vector2();


            const twoPi = Math.PI * 2;

            let deltaAngle = this.aEndAngle - this.aStartAngle;

            const samePoints = Math.abs( deltaAngle ) < Number.EPSILON;


            // ensures that deltaAngle is 0 .. 2 PI

            while ( deltaAngle < 0 ) deltaAngle += twoPi;

            while ( deltaAngle > twoPi ) deltaAngle -= twoPi;


            if ( deltaAngle < Number.EPSILON ) {


                if ( samePoints ) {


                    deltaAngle = 0;


                } else {


                    deltaAngle = twoPi;


                }


            }


            if ( this.aClockwise === true && ! samePoints ) {


                if ( deltaAngle === twoPi ) {


                    deltaAngle = - twoPi;


                } else {


                    deltaAngle = deltaAngle - twoPi;


                }


            }


            const angle = this.aStartAngle + t * deltaAngle;

            let x = this.aX + this.xRadius * Math.cos( angle );

            let y = this.aY + this.yRadius * Math.sin( angle );


            if ( this.aRotation !== 0 ) {


                const cos = Math.cos( this.aRotation );

                const sin = Math.sin( this.aRotation );


                const tx = x - this.aX;

                const ty = y - this.aY;


                // Rotate the point about the center of the ellipse.

                x = tx * cos - ty * sin + this.aX;

                y = tx * sin + ty * cos + this.aY;


            }


            return point.set( x, y );


        }


        copy( source ) {


            super.copy( source );


            this.aX = source.aX;

            this.aY = source.aY;


            this.xRadius = source.xRadius;

            this.yRadius = source.yRadius;


            this.aStartAngle = source.aStartAngle;

            this.aEndAngle = source.aEndAngle;


            this.aClockwise = source.aClockwise;


            this.aRotation = source.aRotation;


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.aX = this.aX;

            data.aY = this.aY;


            data.xRadius = this.xRadius;

            data.yRadius = this.yRadius;


            data.aStartAngle = this.aStartAngle;

            data.aEndAngle = this.aEndAngle;


            data.aClockwise = this.aClockwise;


            data.aRotation = this.aRotation;


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.aX = json.aX;

            this.aY = json.aY;


            this.xRadius = json.xRadius;

            this.yRadius = json.yRadius;


            this.aStartAngle = json.aStartAngle;

            this.aEndAngle = json.aEndAngle;


            this.aClockwise = json.aClockwise;


            this.aRotation = json.aRotation;


            return this;


        }


    }


    class ArcCurve extends EllipseCurve {


        constructor( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {


            super( aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise );


            this.isArcCurve = true;


            this.type = 'ArcCurve';


        }


    }


    /*

    Based on an optimized c++ solution in

     - http://stackoverflow.com/questions/9489736/catmull-rom-curve-with-no-cusps-and-no-self-intersections/

     - http://ideone.com/NoEbVM


    This CubicPoly class could be used for reusing some variables and calculations,

    but for three.js curve use, it could be possible inlined and flatten into a single function call

    which can be placed in CurveUtils.

    */


    function CubicPoly() {


        let c0 = 0, c1 = 0, c2 = 0, c3 = 0;


        /*

         * Compute coefficients for a cubic polynomial

         *   p(s) = c0 + c1*s + c2*s^2 + c3*s^3

         * such that

         *   p(0) = x0, p(1) = x1

         *  and

         *   p'(0) = t0, p'(1) = t1.

         */

        function init( x0, x1, t0, t1 ) {


            c0 = x0;

            c1 = t0;

            c2 = - 3 * x0 + 3 * x1 - 2 * t0 - t1;

            c3 = 2 * x0 - 2 * x1 + t0 + t1;


        }


        return {


            initCatmullRom: function ( x0, x1, x2, x3, tension ) {


                init( x1, x2, tension * ( x2 - x0 ), tension * ( x3 - x1 ) );


            },


            initNonuniformCatmullRom: function ( x0, x1, x2, x3, dt0, dt1, dt2 ) {


                // compute tangents when parameterized in [t1,t2]

                let t1 = ( x1 - x0 ) / dt0 - ( x2 - x0 ) / ( dt0 + dt1 ) + ( x2 - x1 ) / dt1;

                let t2 = ( x2 - x1 ) / dt1 - ( x3 - x1 ) / ( dt1 + dt2 ) + ( x3 - x2 ) / dt2;


                // rescale tangents for parametrization in [0,1]

                t1 *= dt1;

                t2 *= dt1;


                init( x1, x2, t1, t2 );


            },


            calc: function ( t ) {


                const t2 = t * t;

                const t3 = t2 * t;

                return c0 + c1 * t + c2 * t2 + c3 * t3;


            }


        };


    }


    //


    const tmp = /*@__PURE__*/ new Vector3();

    const px = /*@__PURE__*/ new CubicPoly();

    const py = /*@__PURE__*/ new CubicPoly();

    const pz = /*@__PURE__*/ new CubicPoly();


    class CatmullRomCurve3 extends Curve {


        constructor( points = [], closed = false, curveType = 'centripetal', tension = 0.5 ) {


            super();


            this.isCatmullRomCurve3 = true;


            this.type = 'CatmullRomCurve3';


            this.points = points;

            this.closed = closed;

            this.curveType = curveType;

            this.tension = tension;


        }


        getPoint( t, optionalTarget = new Vector3() ) {


            const point = optionalTarget;


            const points = this.points;

            const l = points.length;


            const p = ( l - ( this.closed ? 0 : 1 ) ) * t;

            let intPoint = Math.floor( p );

            let weight = p - intPoint;


            if ( this.closed ) {


                intPoint += intPoint > 0 ? 0 : ( Math.floor( Math.abs( intPoint ) / l ) + 1 ) * l;


            } else if ( weight === 0 && intPoint === l - 1 ) {


                intPoint = l - 2;

                weight = 1;


            }


            let p0, p3; // 4 points (p1 & p2 defined below)


            if ( this.closed || intPoint > 0 ) {


                p0 = points[ ( intPoint - 1 ) % l ];


            } else {


                // extrapolate first point

                tmp.subVectors( points[ 0 ], points[ 1 ] ).add( points[ 0 ] );

                p0 = tmp;


            }


            const p1 = points[ intPoint % l ];

            const p2 = points[ ( intPoint + 1 ) % l ];


            if ( this.closed || intPoint + 2 < l ) {


                p3 = points[ ( intPoint + 2 ) % l ];


            } else {


                // extrapolate last point

                tmp.subVectors( points[ l - 1 ], points[ l - 2 ] ).add( points[ l - 1 ] );

                p3 = tmp;


            }


            if ( this.curveType === 'centripetal' || this.curveType === 'chordal' ) {


                // init Centripetal / Chordal Catmull-Rom

                const pow = this.curveType === 'chordal' ? 0.5 : 0.25;

                let dt0 = Math.pow( p0.distanceToSquared( p1 ), pow );

                let dt1 = Math.pow( p1.distanceToSquared( p2 ), pow );

                let dt2 = Math.pow( p2.distanceToSquared( p3 ), pow );


                // safety check for repeated points

                if ( dt1 < 1e-4 ) dt1 = 1.0;

                if ( dt0 < 1e-4 ) dt0 = dt1;

                if ( dt2 < 1e-4 ) dt2 = dt1;


                px.initNonuniformCatmullRom( p0.x, p1.x, p2.x, p3.x, dt0, dt1, dt2 );

                py.initNonuniformCatmullRom( p0.y, p1.y, p2.y, p3.y, dt0, dt1, dt2 );

                pz.initNonuniformCatmullRom( p0.z, p1.z, p2.z, p3.z, dt0, dt1, dt2 );


            } else if ( this.curveType === 'catmullrom' ) {


                px.initCatmullRom( p0.x, p1.x, p2.x, p3.x, this.tension );

                py.initCatmullRom( p0.y, p1.y, p2.y, p3.y, this.tension );

                pz.initCatmullRom( p0.z, p1.z, p2.z, p3.z, this.tension );


            }


            point.set(

                px.calc( weight ),

                py.calc( weight ),

                pz.calc( weight )

            );


            return point;


        }


        copy( source ) {


            super.copy( source );


            this.points = [];


            for ( let i = 0, l = source.points.length; i < l; i ++ ) {


                const point = source.points[ i ];


                this.points.push( point.clone() );


            }


            this.closed = source.closed;

            this.curveType = source.curveType;

            this.tension = source.tension;


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.points = [];


            for ( let i = 0, l = this.points.length; i < l; i ++ ) {


                const point = this.points[ i ];

                data.points.push( point.toArray() );


            }


            data.closed = this.closed;

            data.curveType = this.curveType;

            data.tension = this.tension;


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.points = [];


            for ( let i = 0, l = json.points.length; i < l; i ++ ) {


                const point = json.points[ i ];

                this.points.push( new Vector3().fromArray( point ) );


            }


            this.closed = json.closed;

            this.curveType = json.curveType;

            this.tension = json.tension;


            return this;


        }


    }


    function CatmullRom( t, p0, p1, p2, p3 ) {


        const v0 = ( p2 - p0 ) * 0.5;

        const v1 = ( p3 - p1 ) * 0.5;

        const t2 = t * t;

        const t3 = t * t2;

        return ( 2 * p1 - 2 * p2 + v0 + v1 ) * t3 + ( - 3 * p1 + 3 * p2 - 2 * v0 - v1 ) * t2 + v0 * t + p1;


    }


    //


    function QuadraticBezierP0( t, p ) {


        const k = 1 - t;

        return k * k * p;


    }


    function QuadraticBezierP1( t, p ) {


        return 2 * ( 1 - t ) * t * p;


    }


    function QuadraticBezierP2( t, p ) {


        return t * t * p;


    }


    function QuadraticBezier( t, p0, p1, p2 ) {


        return QuadraticBezierP0( t, p0 ) + QuadraticBezierP1( t, p1 ) +

            QuadraticBezierP2( t, p2 );


    }


    //


    function CubicBezierP0( t, p ) {


        const k = 1 - t;

        return k * k * k * p;


    }


    function CubicBezierP1( t, p ) {


        const k = 1 - t;

        return 3 * k * k * t * p;


    }


    function CubicBezierP2( t, p ) {


        return 3 * ( 1 - t ) * t * t * p;


    }


    function CubicBezierP3( t, p ) {


        return t * t * t * p;


    }


    function CubicBezier( t, p0, p1, p2, p3 ) {


        return CubicBezierP0( t, p0 ) + CubicBezierP1( t, p1 ) + CubicBezierP2( t, p2 ) +

            CubicBezierP3( t, p3 );


    }


    class CubicBezierCurve extends Curve {


        constructor( v0 = new Vector2(), v1 = new Vector2(), v2 = new Vector2(), v3 = new Vector2() ) {


            super();


            this.isCubicBezierCurve = true;


            this.type = 'CubicBezierCurve';


            this.v0 = v0;

            this.v1 = v1;

            this.v2 = v2;

            this.v3 = v3;


        }


        getPoint( t, optionalTarget = new Vector2() ) {


            const point = optionalTarget;


            const v0 = this.v0, v1 = this.v1, v2 = this.v2, v3 = this.v3;


            point.set(

                CubicBezier( t, v0.x, v1.x, v2.x, v3.x ),

                CubicBezier( t, v0.y, v1.y, v2.y, v3.y )

            );


            return point;


        }


        copy( source ) {


            super.copy( source );


            this.v0.copy( source.v0 );

            this.v1.copy( source.v1 );

            this.v2.copy( source.v2 );

            this.v3.copy( source.v3 );


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.v0 = this.v0.toArray();

            data.v1 = this.v1.toArray();

            data.v2 = this.v2.toArray();

            data.v3 = this.v3.toArray();


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.v0.fromArray( json.v0 );

            this.v1.fromArray( json.v1 );

            this.v2.fromArray( json.v2 );

            this.v3.fromArray( json.v3 );


            return this;


        }


    }


    class CubicBezierCurve3 extends Curve {


        constructor( v0 = new Vector3(), v1 = new Vector3(), v2 = new Vector3(), v3 = new Vector3() ) {


            super();


            this.isCubicBezierCurve3 = true;


            this.type = 'CubicBezierCurve3';


            this.v0 = v0;

            this.v1 = v1;

            this.v2 = v2;

            this.v3 = v3;


        }


        getPoint( t, optionalTarget = new Vector3() ) {


            const point = optionalTarget;


            const v0 = this.v0, v1 = this.v1, v2 = this.v2, v3 = this.v3;


            point.set(

                CubicBezier( t, v0.x, v1.x, v2.x, v3.x ),

                CubicBezier( t, v0.y, v1.y, v2.y, v3.y ),

                CubicBezier( t, v0.z, v1.z, v2.z, v3.z )

            );


            return point;


        }


        copy( source ) {


            super.copy( source );


            this.v0.copy( source.v0 );

            this.v1.copy( source.v1 );

            this.v2.copy( source.v2 );

            this.v3.copy( source.v3 );


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.v0 = this.v0.toArray();

            data.v1 = this.v1.toArray();

            data.v2 = this.v2.toArray();

            data.v3 = this.v3.toArray();


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.v0.fromArray( json.v0 );

            this.v1.fromArray( json.v1 );

            this.v2.fromArray( json.v2 );

            this.v3.fromArray( json.v3 );


            return this;


        }


    }


    class LineCurve extends Curve {


        constructor( v1 = new Vector2(), v2 = new Vector2() ) {


            super();


            this.isLineCurve = true;


            this.type = 'LineCurve';


            this.v1 = v1;

            this.v2 = v2;


        }


        getPoint( t, optionalTarget = new Vector2() ) {


            const point = optionalTarget;


            if ( t === 1 ) {


                point.copy( this.v2 );


            } else {


                point.copy( this.v2 ).sub( this.v1 );

                point.multiplyScalar( t ).add( this.v1 );


            }


            return point;


        }


        // Line curve is linear, so we can overwrite default getPointAt

        getPointAt( u, optionalTarget ) {


            return this.getPoint( u, optionalTarget );


        }


        getTangent( t, optionalTarget = new Vector2() ) {


            return optionalTarget.subVectors( this.v2, this.v1 ).normalize();


        }


        getTangentAt( u, optionalTarget ) {


            return this.getTangent( u, optionalTarget );


        }


        copy( source ) {


            super.copy( source );


            this.v1.copy( source.v1 );

            this.v2.copy( source.v2 );


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.v1 = this.v1.toArray();

            data.v2 = this.v2.toArray();


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.v1.fromArray( json.v1 );

            this.v2.fromArray( json.v2 );


            return this;


        }


    }


    class LineCurve3 extends Curve {


        constructor( v1 = new Vector3(), v2 = new Vector3() ) {


            super();


            this.isLineCurve3 = true;


            this.type = 'LineCurve3';


            this.v1 = v1;

            this.v2 = v2;


        }


        getPoint( t, optionalTarget = new Vector3() ) {


            const point = optionalTarget;


            if ( t === 1 ) {


                point.copy( this.v2 );


            } else {


                point.copy( this.v2 ).sub( this.v1 );

                point.multiplyScalar( t ).add( this.v1 );


            }


            return point;


        }


        // Line curve is linear, so we can overwrite default getPointAt

        getPointAt( u, optionalTarget ) {


            return this.getPoint( u, optionalTarget );


        }


        getTangent( t, optionalTarget = new Vector3() ) {


            return optionalTarget.subVectors( this.v2, this.v1 ).normalize();


        }


        getTangentAt( u, optionalTarget ) {


            return this.getTangent( u, optionalTarget );


        }


        copy( source ) {


            super.copy( source );


            this.v1.copy( source.v1 );

            this.v2.copy( source.v2 );


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.v1 = this.v1.toArray();

            data.v2 = this.v2.toArray();


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.v1.fromArray( json.v1 );

            this.v2.fromArray( json.v2 );


            return this;


        }


    }


    class QuadraticBezierCurve extends Curve {


        constructor( v0 = new Vector2(), v1 = new Vector2(), v2 = new Vector2() ) {


            super();


            this.isQuadraticBezierCurve = true;


            this.type = 'QuadraticBezierCurve';


            this.v0 = v0;

            this.v1 = v1;

            this.v2 = v2;


        }


        getPoint( t, optionalTarget = new Vector2() ) {


            const point = optionalTarget;


            const v0 = this.v0, v1 = this.v1, v2 = this.v2;


            point.set(

                QuadraticBezier( t, v0.x, v1.x, v2.x ),

                QuadraticBezier( t, v0.y, v1.y, v2.y )

            );


            return point;


        }


        copy( source ) {


            super.copy( source );


            this.v0.copy( source.v0 );

            this.v1.copy( source.v1 );

            this.v2.copy( source.v2 );


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.v0 = this.v0.toArray();

            data.v1 = this.v1.toArray();

            data.v2 = this.v2.toArray();


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.v0.fromArray( json.v0 );

            this.v1.fromArray( json.v1 );

            this.v2.fromArray( json.v2 );


            return this;


        }


    }


    class QuadraticBezierCurve3 extends Curve {


        constructor( v0 = new Vector3(), v1 = new Vector3(), v2 = new Vector3() ) {


            super();


            this.isQuadraticBezierCurve3 = true;


            this.type = 'QuadraticBezierCurve3';


            this.v0 = v0;

            this.v1 = v1;

            this.v2 = v2;


        }


        getPoint( t, optionalTarget = new Vector3() ) {


            const point = optionalTarget;


            const v0 = this.v0, v1 = this.v1, v2 = this.v2;


            point.set(

                QuadraticBezier( t, v0.x, v1.x, v2.x ),

                QuadraticBezier( t, v0.y, v1.y, v2.y ),

                QuadraticBezier( t, v0.z, v1.z, v2.z )

            );


            return point;


        }


        copy( source ) {


            super.copy( source );


            this.v0.copy( source.v0 );

            this.v1.copy( source.v1 );

            this.v2.copy( source.v2 );


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.v0 = this.v0.toArray();

            data.v1 = this.v1.toArray();

            data.v2 = this.v2.toArray();


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.v0.fromArray( json.v0 );

            this.v1.fromArray( json.v1 );

            this.v2.fromArray( json.v2 );


            return this;


        }


    }


    class SplineCurve extends Curve {


        constructor( points = [] ) {


            super();


            this.isSplineCurve = true;


            this.type = 'SplineCurve';


            this.points = points;


        }


        getPoint( t, optionalTarget = new Vector2() ) {


            const point = optionalTarget;


            const points = this.points;

            const p = ( points.length - 1 ) * t;


            const intPoint = Math.floor( p );

            const weight = p - intPoint;


            const p0 = points[ intPoint === 0 ? intPoint : intPoint - 1 ];

            const p1 = points[ intPoint ];

            const p2 = points[ intPoint > points.length - 2 ? points.length - 1 : intPoint + 1 ];

            const p3 = points[ intPoint > points.length - 3 ? points.length - 1 : intPoint + 2 ];


            point.set(

                CatmullRom( weight, p0.x, p1.x, p2.x, p3.x ),

                CatmullRom( weight, p0.y, p1.y, p2.y, p3.y )

            );


            return point;


        }


        copy( source ) {


            super.copy( source );


            this.points = [];


            for ( let i = 0, l = source.points.length; i < l; i ++ ) {


                const point = source.points[ i ];


                this.points.push( point.clone() );


            }


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.points = [];


            for ( let i = 0, l = this.points.length; i < l; i ++ ) {


                const point = this.points[ i ];

                data.points.push( point.toArray() );


            }


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.points = [];


            for ( let i = 0, l = json.points.length; i < l; i ++ ) {


                const point = json.points[ i ];

                this.points.push( new Vector2().fromArray( point ) );


            }


            return this;


        }


    }


    var Curves = /*#__PURE__*/Object.freeze({

        __proto__: null,

        ArcCurve: ArcCurve,

        CatmullRomCurve3: CatmullRomCurve3,

        CubicBezierCurve: CubicBezierCurve,

        CubicBezierCurve3: CubicBezierCurve3,

        EllipseCurve: EllipseCurve,

        LineCurve: LineCurve,

        LineCurve3: LineCurve3,

        QuadraticBezierCurve: QuadraticBezierCurve,

        QuadraticBezierCurve3: QuadraticBezierCurve3,

        SplineCurve: SplineCurve

    });


    /**************************************************************

     *  Curved Path - a curve path is simply a array of connected

     *  curves, but retains the api of a curve

     **************************************************************/


    class CurvePath extends Curve {


        constructor() {


            super();


            this.type = 'CurvePath';


            this.curves = [];

            this.autoClose = false; // Automatically closes the path


        }


        add( curve ) {


            this.curves.push( curve );


        }


        closePath() {


            // Add a line curve if start and end of lines are not connected

            const startPoint = this.curves[ 0 ].getPoint( 0 );

            const endPoint = this.curves[ this.curves.length - 1 ].getPoint( 1 );


            if ( ! startPoint.equals( endPoint ) ) {


                const lineType = ( startPoint.isVector2 === true ) ? 'LineCurve' : 'LineCurve3';

                this.curves.push( new Curves[ lineType ]( endPoint, startPoint ) );


            }


            return this;


        }


        // To get accurate point with reference to

        // entire path distance at time t,

        // following has to be done:


        // 1. Length of each sub path have to be known

        // 2. Locate and identify type of curve

        // 3. Get t for the curve

        // 4. Return curve.getPointAt(t')


        getPoint( t, optionalTarget ) {


            const d = t * this.getLength();

            const curveLengths = this.getCurveLengths();

            let i = 0;


            // To think about boundaries points.


            while ( i < curveLengths.length ) {


                if ( curveLengths[ i ] >= d ) {


                    const diff = curveLengths[ i ] - d;

                    const curve = this.curves[ i ];


                    const segmentLength = curve.getLength();

                    const u = segmentLength === 0 ? 0 : 1 - diff / segmentLength;


                    return curve.getPointAt( u, optionalTarget );


                }


                i ++;


            }


            return null;


            // loop where sum != 0, sum > d , sum+1 <d


        }


        // We cannot use the default THREE.Curve getPoint() with getLength() because in

        // THREE.Curve, getLength() depends on getPoint() but in THREE.CurvePath

        // getPoint() depends on getLength


        getLength() {


            const lens = this.getCurveLengths();

            return lens[ lens.length - 1 ];


        }


        // cacheLengths must be recalculated.

        updateArcLengths() {


            this.needsUpdate = true;

            this.cacheLengths = null;

            this.getCurveLengths();


        }


        // Compute lengths and cache them

        // We cannot overwrite getLengths() because UtoT mapping uses it.


        getCurveLengths() {


            // We use cache values if curves and cache array are same length


            if ( this.cacheLengths && this.cacheLengths.length === this.curves.length ) {


                return this.cacheLengths;


            }


            // Get length of sub-curve

            // Push sums into cached array


            const lengths = [];

            let sums = 0;


            for ( let i = 0, l = this.curves.length; i < l; i ++ ) {


                sums += this.curves[ i ].getLength();

                lengths.push( sums );


            }


            this.cacheLengths = lengths;


            return lengths;


        }


        getSpacedPoints( divisions = 40 ) {


            const points = [];


            for ( let i = 0; i <= divisions; i ++ ) {


                points.push( this.getPoint( i / divisions ) );


            }


            if ( this.autoClose ) {


                points.push( points[ 0 ] );


            }


            return points;


        }


        getPoints( divisions = 12 ) {


            const points = [];

            let last;


            for ( let i = 0, curves = this.curves; i < curves.length; i ++ ) {


                const curve = curves[ i ];

                const resolution = curve.isEllipseCurve ? divisions * 2

                    : ( curve.isLineCurve || curve.isLineCurve3 ) ? 1

                        : curve.isSplineCurve ? divisions * curve.points.length

                            : divisions;


                const pts = curve.getPoints( resolution );


                for ( let j = 0; j < pts.length; j ++ ) {


                    const point = pts[ j ];


                    if ( last && last.equals( point ) ) continue; // ensures no consecutive points are duplicates


                    points.push( point );

                    last = point;


                }


            }


            if ( this.autoClose && points.length > 1 && ! points[ points.length - 1 ].equals( points[ 0 ] ) ) {


                points.push( points[ 0 ] );


            }


            return points;


        }


        copy( source ) {


            super.copy( source );


            this.curves = [];


            for ( let i = 0, l = source.curves.length; i < l; i ++ ) {


                const curve = source.curves[ i ];


                this.curves.push( curve.clone() );


            }


            this.autoClose = source.autoClose;


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.autoClose = this.autoClose;

            data.curves = [];


            for ( let i = 0, l = this.curves.length; i < l; i ++ ) {


                const curve = this.curves[ i ];

                data.curves.push( curve.toJSON() );


            }


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.autoClose = json.autoClose;

            this.curves = [];


            for ( let i = 0, l = json.curves.length; i < l; i ++ ) {


                const curve = json.curves[ i ];

                this.curves.push( new Curves[ curve.type ]().fromJSON( curve ) );


            }


            return this;


        }


    }


    class Path extends CurvePath {


        constructor( points ) {


            super();


            this.type = 'Path';


            this.currentPoint = new Vector2();


            if ( points ) {


                this.setFromPoints( points );


            }


        }


        setFromPoints( points ) {


            this.moveTo( points[ 0 ].x, points[ 0 ].y );


            for ( let i = 1, l = points.length; i < l; i ++ ) {


                this.lineTo( points[ i ].x, points[ i ].y );


            }


            return this;


        }


        moveTo( x, y ) {


            this.currentPoint.set( x, y ); // TODO consider referencing vectors instead of copying?


            return this;


        }


        lineTo( x, y ) {


            const curve = new LineCurve( this.currentPoint.clone(), new Vector2( x, y ) );

            this.curves.push( curve );


            this.currentPoint.set( x, y );


            return this;


        }


        quadraticCurveTo( aCPx, aCPy, aX, aY ) {


            const curve = new QuadraticBezierCurve(

                this.currentPoint.clone(),

                new Vector2( aCPx, aCPy ),

                new Vector2( aX, aY )

            );


            this.curves.push( curve );


            this.currentPoint.set( aX, aY );


            return this;


        }


        bezierCurveTo( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY ) {


            const curve = new CubicBezierCurve(

                this.currentPoint.clone(),

                new Vector2( aCP1x, aCP1y ),

                new Vector2( aCP2x, aCP2y ),

                new Vector2( aX, aY )

            );


            this.curves.push( curve );


            this.currentPoint.set( aX, aY );


            return this;


        }


        splineThru( pts /*Array of Vector*/ ) {


            const npts = [ this.currentPoint.clone() ].concat( pts );


            const curve = new SplineCurve( npts );

            this.curves.push( curve );


            this.currentPoint.copy( pts[ pts.length - 1 ] );


            return this;


        }


        arc( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {


            const x0 = this.currentPoint.x;

            const y0 = this.currentPoint.y;


            this.absarc( aX + x0, aY + y0, aRadius,

                aStartAngle, aEndAngle, aClockwise );


            return this;


        }


        absarc( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {


            this.absellipse( aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise );


            return this;


        }


        ellipse( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation ) {


            const x0 = this.currentPoint.x;

            const y0 = this.currentPoint.y;


            this.absellipse( aX + x0, aY + y0, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation );


            return this;


        }


        absellipse( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation ) {


            const curve = new EllipseCurve( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation );


            if ( this.curves.length > 0 ) {


                // if a previous curve is present, attempt to join

                const firstPoint = curve.getPoint( 0 );


                if ( ! firstPoint.equals( this.currentPoint ) ) {


                    this.lineTo( firstPoint.x, firstPoint.y );


                }


            }


            this.curves.push( curve );


            const lastPoint = curve.getPoint( 1 );

            this.currentPoint.copy( lastPoint );


            return this;


        }


        copy( source ) {


            super.copy( source );


            this.currentPoint.copy( source.currentPoint );


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.currentPoint = this.currentPoint.toArray();


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.currentPoint.fromArray( json.currentPoint );


            return this;


        }


    }


    class LatheGeometry extends BufferGeometry {


        constructor( points = [ new Vector2( 0, - 0.5 ), new Vector2( 0.5, 0 ), new Vector2( 0, 0.5 ) ], segments = 12, phiStart = 0, phiLength = Math.PI * 2 ) {


            super();


            this.type = 'LatheGeometry';


            this.parameters = {

                points: points,

                segments: segments,

                phiStart: phiStart,

                phiLength: phiLength

            };


            segments = Math.floor( segments );


            // clamp phiLength so it's in range of [ 0, 2PI ]


            phiLength = clamp( phiLength, 0, Math.PI * 2 );


            // buffers


            const indices = [];

            const vertices = [];

            const uvs = [];

            const initNormals = [];

            const normals = [];


            // helper variables


            const inverseSegments = 1.0 / segments;

            const vertex = new Vector3();

            const uv = new Vector2();

            const normal = new Vector3();

            const curNormal = new Vector3();

            const prevNormal = new Vector3();

            let dx = 0;

            let dy = 0;


            // pre-compute normals for initial "meridian"


            for ( let j = 0; j <= ( points.length - 1 ); j ++ ) {


                switch ( j ) {


                    case 0:             // special handling for 1st vertex on path


                        dx = points[ j + 1 ].x - points[ j ].x;

                        dy = points[ j + 1 ].y - points[ j ].y;


                        normal.x = dy * 1.0;

                        normal.y = - dx;

                        normal.z = dy * 0.0;


                        prevNormal.copy( normal );


                        normal.normalize();


                        initNormals.push( normal.x, normal.y, normal.z );


                        break;


                    case ( points.length - 1 ): // special handling for last Vertex on path


                        initNormals.push( prevNormal.x, prevNormal.y, prevNormal.z );


                        break;


                    default:            // default handling for all vertices in between


                        dx = points[ j + 1 ].x - points[ j ].x;

                        dy = points[ j + 1 ].y - points[ j ].y;


                        normal.x = dy * 1.0;

                        normal.y = - dx;

                        normal.z = dy * 0.0;


                        curNormal.copy( normal );


                        normal.x += prevNormal.x;

                        normal.y += prevNormal.y;

                        normal.z += prevNormal.z;


                        normal.normalize();


                        initNormals.push( normal.x, normal.y, normal.z );


                        prevNormal.copy( curNormal );


                }


            }


            // generate vertices, uvs and normals


            for ( let i = 0; i <= segments; i ++ ) {


                const phi = phiStart + i * inverseSegments * phiLength;


                const sin = Math.sin( phi );

                const cos = Math.cos( phi );


                for ( let j = 0; j <= ( points.length - 1 ); j ++ ) {


                    // vertex


                    vertex.x = points[ j ].x * sin;

                    vertex.y = points[ j ].y;

                    vertex.z = points[ j ].x * cos;


                    vertices.push( vertex.x, vertex.y, vertex.z );


                    // uv


                    uv.x = i / segments;

                    uv.y = j / ( points.length - 1 );


                    uvs.push( uv.x, uv.y );


                    // normal


                    const x = initNormals[ 3 * j + 0 ] * sin;

                    const y = initNormals[ 3 * j + 1 ];

                    const z = initNormals[ 3 * j + 0 ] * cos;


                    normals.push( x, y, z );


                }


            }


            // indices


            for ( let i = 0; i < segments; i ++ ) {


                for ( let j = 0; j < ( points.length - 1 ); j ++ ) {


                    const base = j + i * points.length;


                    const a = base;

                    const b = base + points.length;

                    const c = base + points.length + 1;

                    const d = base + 1;


                    // faces


                    indices.push( a, b, d );

                    indices.push( c, d, b );


                }


            }


            // build geometry


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        static fromJSON( data ) {


            return new LatheGeometry( data.points, data.segments, data.phiStart, data.phiLength );


        }


    }


    class CapsuleGeometry extends LatheGeometry {


        constructor( radius = 1, length = 1, capSegments = 4, radialSegments = 8 ) {


            const path = new Path();

            path.absarc( 0, - length / 2, radius, Math.PI * 1.5, 0 );

            path.absarc( 0, length / 2, radius, 0, Math.PI * 0.5 );


            super( path.getPoints( capSegments ), radialSegments );


            this.type = 'CapsuleGeometry';


            this.parameters = {

                radius: radius,

                length: length,

                capSegments: capSegments,

                radialSegments: radialSegments,

            };


        }


        static fromJSON( data ) {


            return new CapsuleGeometry( data.radius, data.length, data.capSegments, data.radialSegments );


        }


    }


    class CircleGeometry extends BufferGeometry {


        constructor( radius = 1, segments = 32, thetaStart = 0, thetaLength = Math.PI * 2 ) {


            super();


            this.type = 'CircleGeometry';


            this.parameters = {

                radius: radius,

                segments: segments,

                thetaStart: thetaStart,

                thetaLength: thetaLength

            };


            segments = Math.max( 3, segments );


            // buffers


            const indices = [];

            const vertices = [];

            const normals = [];

            const uvs = [];


            // helper variables


            const vertex = new Vector3();

            const uv = new Vector2();


            // center point


            vertices.push( 0, 0, 0 );

            normals.push( 0, 0, 1 );

            uvs.push( 0.5, 0.5 );


            for ( let s = 0, i = 3; s <= segments; s ++, i += 3 ) {


                const segment = thetaStart + s / segments * thetaLength;


                // vertex


                vertex.x = radius * Math.cos( segment );

                vertex.y = radius * Math.sin( segment );


                vertices.push( vertex.x, vertex.y, vertex.z );


                // normal


                normals.push( 0, 0, 1 );


                // uvs


                uv.x = ( vertices[ i ] / radius + 1 ) / 2;

                uv.y = ( vertices[ i + 1 ] / radius + 1 ) / 2;


                uvs.push( uv.x, uv.y );


            }


            // indices


            for ( let i = 1; i <= segments; i ++ ) {


                indices.push( i, i + 1, 0 );


            }


            // build geometry


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        static fromJSON( data ) {


            return new CircleGeometry( data.radius, data.segments, data.thetaStart, data.thetaLength );


        }


    }


    class CylinderGeometry extends BufferGeometry {


        constructor( radiusTop = 1, radiusBottom = 1, height = 1, radialSegments = 32, heightSegments = 1, openEnded = false, thetaStart = 0, thetaLength = Math.PI * 2 ) {


            super();


            this.type = 'CylinderGeometry';


            this.parameters = {

                radiusTop: radiusTop,

                radiusBottom: radiusBottom,

                height: height,

                radialSegments: radialSegments,

                heightSegments: heightSegments,

                openEnded: openEnded,

                thetaStart: thetaStart,

                thetaLength: thetaLength

            };


            const scope = this;


            radialSegments = Math.floor( radialSegments );

            heightSegments = Math.floor( heightSegments );


            // buffers


            const indices = [];

            const vertices = [];

            const normals = [];

            const uvs = [];


            // helper variables


            let index = 0;

            const indexArray = [];

            const halfHeight = height / 2;

            let groupStart = 0;


            // generate geometry


            generateTorso();


            if ( openEnded === false ) {


                if ( radiusTop > 0 ) generateCap( true );

                if ( radiusBottom > 0 ) generateCap( false );


            }


            // build geometry


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


            function generateTorso() {


                const normal = new Vector3();

                const vertex = new Vector3();


                let groupCount = 0;


                // this will be used to calculate the normal

                const slope = ( radiusBottom - radiusTop ) / height;


                // generate vertices, normals and uvs


                for ( let y = 0; y <= heightSegments; y ++ ) {


                    const indexRow = [];


                    const v = y / heightSegments;


                    // calculate the radius of the current row


                    const radius = v * ( radiusBottom - radiusTop ) + radiusTop;


                    for ( let x = 0; x <= radialSegments; x ++ ) {


                        const u = x / radialSegments;


                        const theta = u * thetaLength + thetaStart;


                        const sinTheta = Math.sin( theta );

                        const cosTheta = Math.cos( theta );


                        // vertex


                        vertex.x = radius * sinTheta;

                        vertex.y = - v * height + halfHeight;

                        vertex.z = radius * cosTheta;

                        vertices.push( vertex.x, vertex.y, vertex.z );


                        // normal


                        normal.set( sinTheta, slope, cosTheta ).normalize();

                        normals.push( normal.x, normal.y, normal.z );


                        // uv


                        uvs.push( u, 1 - v );


                        // save index of vertex in respective row


                        indexRow.push( index ++ );


                    }


                    // now save vertices of the row in our index array


                    indexArray.push( indexRow );


                }


                // generate indices


                for ( let x = 0; x < radialSegments; x ++ ) {


                    for ( let y = 0; y < heightSegments; y ++ ) {


                        // we use the index array to access the correct indices


                        const a = indexArray[ y ][ x ];

                        const b = indexArray[ y + 1 ][ x ];

                        const c = indexArray[ y + 1 ][ x + 1 ];

                        const d = indexArray[ y ][ x + 1 ];


                        // faces


                        indices.push( a, b, d );

                        indices.push( b, c, d );


                        // update group counter


                        groupCount += 6;


                    }


                }


                // add a group to the geometry. this will ensure multi material support


                scope.addGroup( groupStart, groupCount, 0 );


                // calculate new start value for groups


                groupStart += groupCount;


            }


            function generateCap( top ) {


                // save the index of the first center vertex

                const centerIndexStart = index;


                const uv = new Vector2();

                const vertex = new Vector3();


                let groupCount = 0;


                const radius = ( top === true ) ? radiusTop : radiusBottom;

                const sign = ( top === true ) ? 1 : - 1;


                // first we generate the center vertex data of the cap.

                // because the geometry needs one set of uvs per face,

                // we must generate a center vertex per face/segment


                for ( let x = 1; x <= radialSegments; x ++ ) {


                    // vertex


                    vertices.push( 0, halfHeight * sign, 0 );


                    // normal


                    normals.push( 0, sign, 0 );


                    // uv


                    uvs.push( 0.5, 0.5 );


                    // increase index


                    index ++;


                }


                // save the index of the last center vertex

                const centerIndexEnd = index;


                // now we generate the surrounding vertices, normals and uvs


                for ( let x = 0; x <= radialSegments; x ++ ) {


                    const u = x / radialSegments;

                    const theta = u * thetaLength + thetaStart;


                    const cosTheta = Math.cos( theta );

                    const sinTheta = Math.sin( theta );


                    // vertex


                    vertex.x = radius * sinTheta;

                    vertex.y = halfHeight * sign;

                    vertex.z = radius * cosTheta;

                    vertices.push( vertex.x, vertex.y, vertex.z );


                    // normal


                    normals.push( 0, sign, 0 );


                    // uv


                    uv.x = ( cosTheta * 0.5 ) + 0.5;

                    uv.y = ( sinTheta * 0.5 * sign ) + 0.5;

                    uvs.push( uv.x, uv.y );


                    // increase index


                    index ++;


                }


                // generate indices


                for ( let x = 0; x < radialSegments; x ++ ) {


                    const c = centerIndexStart + x;

                    const i = centerIndexEnd + x;


                    if ( top === true ) {


                        // face top


                        indices.push( i, i + 1, c );


                    } else {


                        // face bottom


                        indices.push( i + 1, i, c );


                    }


                    groupCount += 3;


                }


                // add a group to the geometry. this will ensure multi material support


                scope.addGroup( groupStart, groupCount, top === true ? 1 : 2 );


                // calculate new start value for groups


                groupStart += groupCount;


            }


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        static fromJSON( data ) {


            return new CylinderGeometry( data.radiusTop, data.radiusBottom, data.height, data.radialSegments, data.heightSegments, data.openEnded, data.thetaStart, data.thetaLength );


        }


    }


    class ConeGeometry extends CylinderGeometry {


        constructor( radius = 1, height = 1, radialSegments = 32, heightSegments = 1, openEnded = false, thetaStart = 0, thetaLength = Math.PI * 2 ) {


            super( 0, radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength );


            this.type = 'ConeGeometry';


            this.parameters = {

                radius: radius,

                height: height,

                radialSegments: radialSegments,

                heightSegments: heightSegments,

                openEnded: openEnded,

                thetaStart: thetaStart,

                thetaLength: thetaLength

            };


        }


        static fromJSON( data ) {


            return new ConeGeometry( data.radius, data.height, data.radialSegments, data.heightSegments, data.openEnded, data.thetaStart, data.thetaLength );


        }


    }


    class PolyhedronGeometry extends BufferGeometry {


        constructor( vertices = [], indices = [], radius = 1, detail = 0 ) {


            super();


            this.type = 'PolyhedronGeometry';


            this.parameters = {

                vertices: vertices,

                indices: indices,

                radius: radius,

                detail: detail

            };


            // default buffer data


            const vertexBuffer = [];

            const uvBuffer = [];


            // the subdivision creates the vertex buffer data


            subdivide( detail );


            // all vertices should lie on a conceptual sphere with a given radius


            applyRadius( radius );


            // finally, create the uv data


            generateUVs();


            // build non-indexed geometry


            this.setAttribute( 'position', new Float32BufferAttribute( vertexBuffer, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( vertexBuffer.slice(), 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvBuffer, 2 ) );


            if ( detail === 0 ) {


                this.computeVertexNormals(); // flat normals


            } else {


                this.normalizeNormals(); // smooth normals


            }


            // helper functions


            function subdivide( detail ) {


                const a = new Vector3();

                const b = new Vector3();

                const c = new Vector3();


                // iterate over all faces and apply a subdivision with the given detail value


                for ( let i = 0; i < indices.length; i += 3 ) {


                    // get the vertices of the face


                    getVertexByIndex( indices[ i + 0 ], a );

                    getVertexByIndex( indices[ i + 1 ], b );

                    getVertexByIndex( indices[ i + 2 ], c );


                    // perform subdivision


                    subdivideFace( a, b, c, detail );


                }


            }


            function subdivideFace( a, b, c, detail ) {


                const cols = detail + 1;


                // we use this multidimensional array as a data structure for creating the subdivision


                const v = [];


                // construct all of the vertices for this subdivision


                for ( let i = 0; i <= cols; i ++ ) {


                    v[ i ] = [];


                    const aj = a.clone().lerp( c, i / cols );

                    const bj = b.clone().lerp( c, i / cols );


                    const rows = cols - i;


                    for ( let j = 0; j <= rows; j ++ ) {


                        if ( j === 0 && i === cols ) {


                            v[ i ][ j ] = aj;


                        } else {


                            v[ i ][ j ] = aj.clone().lerp( bj, j / rows );


                        }


                    }


                }


                // construct all of the faces


                for ( let i = 0; i < cols; i ++ ) {


                    for ( let j = 0; j < 2 * ( cols - i ) - 1; j ++ ) {


                        const k = Math.floor( j / 2 );


                        if ( j % 2 === 0 ) {


                            pushVertex( v[ i ][ k + 1 ] );

                            pushVertex( v[ i + 1 ][ k ] );

                            pushVertex( v[ i ][ k ] );


                        } else {


                            pushVertex( v[ i ][ k + 1 ] );

                            pushVertex( v[ i + 1 ][ k + 1 ] );

                            pushVertex( v[ i + 1 ][ k ] );


                        }


                    }


                }


            }


            function applyRadius( radius ) {


                const vertex = new Vector3();


                // iterate over the entire buffer and apply the radius to each vertex


                for ( let i = 0; i < vertexBuffer.length; i += 3 ) {


                    vertex.x = vertexBuffer[ i + 0 ];

                    vertex.y = vertexBuffer[ i + 1 ];

                    vertex.z = vertexBuffer[ i + 2 ];


                    vertex.normalize().multiplyScalar( radius );


                    vertexBuffer[ i + 0 ] = vertex.x;

                    vertexBuffer[ i + 1 ] = vertex.y;

                    vertexBuffer[ i + 2 ] = vertex.z;


                }


            }


            function generateUVs() {


                const vertex = new Vector3();


                for ( let i = 0; i < vertexBuffer.length; i += 3 ) {


                    vertex.x = vertexBuffer[ i + 0 ];

                    vertex.y = vertexBuffer[ i + 1 ];

                    vertex.z = vertexBuffer[ i + 2 ];


                    const u = azimuth( vertex ) / 2 / Math.PI + 0.5;

                    const v = inclination( vertex ) / Math.PI + 0.5;

                    uvBuffer.push( u, 1 - v );


                }


                correctUVs();


                correctSeam();


            }


            function correctSeam() {


                // handle case when face straddles the seam, see #3269


                for ( let i = 0; i < uvBuffer.length; i += 6 ) {


                    // uv data of a single face


                    const x0 = uvBuffer[ i + 0 ];

                    const x1 = uvBuffer[ i + 2 ];

                    const x2 = uvBuffer[ i + 4 ];


                    const max = Math.max( x0, x1, x2 );

                    const min = Math.min( x0, x1, x2 );


                    // 0.9 is somewhat arbitrary


                    if ( max > 0.9 && min < 0.1 ) {


                        if ( x0 < 0.2 ) uvBuffer[ i + 0 ] += 1;

                        if ( x1 < 0.2 ) uvBuffer[ i + 2 ] += 1;

                        if ( x2 < 0.2 ) uvBuffer[ i + 4 ] += 1;


                    }


                }


            }


            function pushVertex( vertex ) {


                vertexBuffer.push( vertex.x, vertex.y, vertex.z );


            }


            function getVertexByIndex( index, vertex ) {


                const stride = index * 3;


                vertex.x = vertices[ stride + 0 ];

                vertex.y = vertices[ stride + 1 ];

                vertex.z = vertices[ stride + 2 ];


            }


            function correctUVs() {


                const a = new Vector3();

                const b = new Vector3();

                const c = new Vector3();


                const centroid = new Vector3();


                const uvA = new Vector2();

                const uvB = new Vector2();

                const uvC = new Vector2();


                for ( let i = 0, j = 0; i < vertexBuffer.length; i += 9, j += 6 ) {


                    a.set( vertexBuffer[ i + 0 ], vertexBuffer[ i + 1 ], vertexBuffer[ i + 2 ] );

                    b.set( vertexBuffer[ i + 3 ], vertexBuffer[ i + 4 ], vertexBuffer[ i + 5 ] );

                    c.set( vertexBuffer[ i + 6 ], vertexBuffer[ i + 7 ], vertexBuffer[ i + 8 ] );


                    uvA.set( uvBuffer[ j + 0 ], uvBuffer[ j + 1 ] );

                    uvB.set( uvBuffer[ j + 2 ], uvBuffer[ j + 3 ] );

                    uvC.set( uvBuffer[ j + 4 ], uvBuffer[ j + 5 ] );


                    centroid.copy( a ).add( b ).add( c ).divideScalar( 3 );


                    const azi = azimuth( centroid );


                    correctUV( uvA, j + 0, a, azi );

                    correctUV( uvB, j + 2, b, azi );

                    correctUV( uvC, j + 4, c, azi );


                }


            }


            function correctUV( uv, stride, vector, azimuth ) {


                if ( ( azimuth < 0 ) && ( uv.x === 1 ) ) {


                    uvBuffer[ stride ] = uv.x - 1;


                }


                if ( ( vector.x === 0 ) && ( vector.z === 0 ) ) {


                    uvBuffer[ stride ] = azimuth / 2 / Math.PI + 0.5;


                }


            }


            // Angle around the Y axis, counter-clockwise when looking from above.


            function azimuth( vector ) {


                return Math.atan2( vector.z, - vector.x );


            }


            // Angle above the XZ plane.


            function inclination( vector ) {


                return Math.atan2( - vector.y, Math.sqrt( ( vector.x * vector.x ) + ( vector.z * vector.z ) ) );


            }


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        static fromJSON( data ) {


            return new PolyhedronGeometry( data.vertices, data.indices, data.radius, data.details );


        }


    }


    class DodecahedronGeometry extends PolyhedronGeometry {


        constructor( radius = 1, detail = 0 ) {


            const t = ( 1 + Math.sqrt( 5 ) ) / 2;

            const r = 1 / t;


            const vertices = [


                // (±1, ±1, ±1)

                - 1, - 1, - 1,  - 1, - 1, 1,

                - 1, 1, - 1, - 1, 1, 1,

                1, - 1, - 1, 1, - 1, 1,

                1, 1, - 1, 1, 1, 1,


                // (0, ±1/φ, ±φ)

                0, - r, - t, 0, - r, t,

                0, r, - t, 0, r, t,


                // (±1/φ, ±φ, 0)

                - r, - t, 0, - r, t, 0,

                r, - t, 0, r, t, 0,


                // (±φ, 0, ±1/φ)

                - t, 0, - r, t, 0, - r,

                - t, 0, r, t, 0, r

            ];


            const indices = [

                3, 11, 7,   3, 7, 15,   3, 15, 13,

                7, 19, 17,  7, 17, 6,   7, 6, 15,

                17, 4, 8,   17, 8, 10,  17, 10, 6,

                8, 0, 16,   8, 16, 2,   8, 2, 10,

                0, 12, 1,   0, 1, 18,   0, 18, 16,

                6, 10, 2,   6, 2, 13,   6, 13, 15,

                2, 16, 18,  2, 18, 3,   2, 3, 13,

                18, 1, 9,   18, 9, 11,  18, 11, 3,

                4, 14, 12,  4, 12, 0,   4, 0, 8,

                11, 9, 5,   11, 5, 19,  11, 19, 7,

                19, 5, 14,  19, 14, 4,  19, 4, 17,

                1, 12, 14,  1, 14, 5,   1, 5, 9

            ];


            super( vertices, indices, radius, detail );


            this.type = 'DodecahedronGeometry';


            this.parameters = {

                radius: radius,

                detail: detail

            };


        }


        static fromJSON( data ) {


            return new DodecahedronGeometry( data.radius, data.detail );


        }


    }


    const _v0 = /*@__PURE__*/ new Vector3();

    const _v1$1 = /*@__PURE__*/ new Vector3();

    const _normal = /*@__PURE__*/ new Vector3();

    const _triangle = /*@__PURE__*/ new Triangle();


    class EdgesGeometry extends BufferGeometry {


        constructor( geometry = null, thresholdAngle = 1 ) {


            super();


            this.type = 'EdgesGeometry';


            this.parameters = {

                geometry: geometry,

                thresholdAngle: thresholdAngle

            };


            if ( geometry !== null ) {


                const precisionPoints = 4;

                const precision = Math.pow( 10, precisionPoints );

                const thresholdDot = Math.cos( DEG2RAD * thresholdAngle );


                const indexAttr = geometry.getIndex();

                const positionAttr = geometry.getAttribute( 'position' );

                const indexCount = indexAttr ? indexAttr.count : positionAttr.count;


                const indexArr = [ 0, 0, 0 ];

                const vertKeys = [ 'a', 'b', 'c' ];

                const hashes = new Array( 3 );


                const edgeData = {};

                const vertices = [];

                for ( let i = 0; i < indexCount; i += 3 ) {


                    if ( indexAttr ) {


                        indexArr[ 0 ] = indexAttr.getX( i );

                        indexArr[ 1 ] = indexAttr.getX( i + 1 );

                        indexArr[ 2 ] = indexAttr.getX( i + 2 );


                    } else {


                        indexArr[ 0 ] = i;

                        indexArr[ 1 ] = i + 1;

                        indexArr[ 2 ] = i + 2;


                    }


                    const { a, b, c } = _triangle;

                    a.fromBufferAttribute( positionAttr, indexArr[ 0 ] );

                    b.fromBufferAttribute( positionAttr, indexArr[ 1 ] );

                    c.fromBufferAttribute( positionAttr, indexArr[ 2 ] );

                    _triangle.getNormal( _normal );


                    // create hashes for the edge from the vertices

                    hashes[ 0 ] = `${ Math.round( a.x * precision ) },${ Math.round( a.y * precision ) },${ Math.round( a.z * precision ) }`;

                    hashes[ 1 ] = `${ Math.round( b.x * precision ) },${ Math.round( b.y * precision ) },${ Math.round( b.z * precision ) }`;

                    hashes[ 2 ] = `${ Math.round( c.x * precision ) },${ Math.round( c.y * precision ) },${ Math.round( c.z * precision ) }`;


                    // skip degenerate triangles

                    if ( hashes[ 0 ] === hashes[ 1 ] || hashes[ 1 ] === hashes[ 2 ] || hashes[ 2 ] === hashes[ 0 ] ) {


                        continue;


                    }


                    // iterate over every edge

                    for ( let j = 0; j < 3; j ++ ) {


                        // get the first and next vertex making up the edge

                        const jNext = ( j + 1 ) % 3;

                        const vecHash0 = hashes[ j ];

                        const vecHash1 = hashes[ jNext ];

                        const v0 = _triangle[ vertKeys[ j ] ];

                        const v1 = _triangle[ vertKeys[ jNext ] ];


                        const hash = `${ vecHash0 }_${ vecHash1 }`;

                        const reverseHash = `${ vecHash1 }_${ vecHash0 }`;


                        if ( reverseHash in edgeData && edgeData[ reverseHash ] ) {


                            // if we found a sibling edge add it into the vertex array if

                            // it meets the angle threshold and delete the edge from the map.

                            if ( _normal.dot( edgeData[ reverseHash ].normal ) <= thresholdDot ) {


                                vertices.push( v0.x, v0.y, v0.z );

                                vertices.push( v1.x, v1.y, v1.z );


                            }


                            edgeData[ reverseHash ] = null;


                        } else if ( ! ( hash in edgeData ) ) {


                            // if we've already got an edge here then skip adding a new one

                            edgeData[ hash ] = {


                                index0: indexArr[ j ],

                                index1: indexArr[ jNext ],

                                normal: _normal.clone(),


                            };


                        }


                    }


                }


                // iterate over all remaining, unmatched edges and add them to the vertex array

                for ( const key in edgeData ) {


                    if ( edgeData[ key ] ) {


                        const { index0, index1 } = edgeData[ key ];

                        _v0.fromBufferAttribute( positionAttr, index0 );

                        _v1$1.fromBufferAttribute( positionAttr, index1 );


                        vertices.push( _v0.x, _v0.y, _v0.z );

                        vertices.push( _v1$1.x, _v1$1.y, _v1$1.z );


                    }


                }


                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );


            }


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


    }


    class Shape extends Path {


        constructor( points ) {


            super( points );


            this.uuid = generateUUID();


            this.type = 'Shape';


            this.holes = [];


        }


        getPointsHoles( divisions ) {


            const holesPts = [];


            for ( let i = 0, l = this.holes.length; i < l; i ++ ) {


                holesPts[ i ] = this.holes[ i ].getPoints( divisions );


            }


            return holesPts;


        }


        // get points of shape and holes (keypoints based on segments parameter)


        extractPoints( divisions ) {


            return {


                shape: this.getPoints( divisions ),

                holes: this.getPointsHoles( divisions )


            };


        }


        copy( source ) {


            super.copy( source );


            this.holes = [];


            for ( let i = 0, l = source.holes.length; i < l; i ++ ) {


                const hole = source.holes[ i ];


                this.holes.push( hole.clone() );


            }


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.uuid = this.uuid;

            data.holes = [];


            for ( let i = 0, l = this.holes.length; i < l; i ++ ) {


                const hole = this.holes[ i ];

                data.holes.push( hole.toJSON() );


            }


            return data;


        }


        fromJSON( json ) {


            super.fromJSON( json );


            this.uuid = json.uuid;

            this.holes = [];


            for ( let i = 0, l = json.holes.length; i < l; i ++ ) {


                const hole = json.holes[ i ];

                this.holes.push( new Path().fromJSON( hole ) );


            }


            return this;


        }


    }


    const Earcut = {


        triangulate: function ( data, holeIndices, dim = 2 ) {


            const hasHoles = holeIndices && holeIndices.length;

            const outerLen = hasHoles ? holeIndices[ 0 ] * dim : data.length;

            let outerNode = linkedList( data, 0, outerLen, dim, true );

            const triangles = [];


            if ( ! outerNode || outerNode.next === outerNode.prev ) return triangles;


            let minX, minY, maxX, maxY, x, y, invSize;


            if ( hasHoles ) outerNode = eliminateHoles( data, holeIndices, outerNode, dim );


            // if the shape is not too simple, we'll use z-order curve hash later; calculate polygon bbox

            if ( data.length > 80 * dim ) {


                minX = maxX = data[ 0 ];

                minY = maxY = data[ 1 ];


                for ( let i = dim; i < outerLen; i += dim ) {


                    x = data[ i ];

                    y = data[ i + 1 ];

                    if ( x < minX ) minX = x;

                    if ( y < minY ) minY = y;

                    if ( x > maxX ) maxX = x;

                    if ( y > maxY ) maxY = y;


                }


                // minX, minY and invSize are later used to transform coords into integers for z-order calculation

                invSize = Math.max( maxX - minX, maxY - minY );

                invSize = invSize !== 0 ? 32767 / invSize : 0;


            }


            earcutLinked( outerNode, triangles, dim, minX, minY, invSize, 0 );


            return triangles;


        }


    };


    // create a circular doubly linked list from polygon points in the specified winding order

    function linkedList( data, start, end, dim, clockwise ) {


        let i, last;


        if ( clockwise === ( signedArea( data, start, end, dim ) > 0 ) ) {


            for ( i = start; i < end; i += dim ) last = insertNode( i, data[ i ], data[ i + 1 ], last );


        } else {


            for ( i = end - dim; i >= start; i -= dim ) last = insertNode( i, data[ i ], data[ i + 1 ], last );


        }


        if ( last && equals( last, last.next ) ) {


            removeNode( last );

            last = last.next;


        }


        return last;


    }


    // eliminate colinear or duplicate points

    function filterPoints( start, end ) {


        if ( ! start ) return start;

        if ( ! end ) end = start;


        let p = start,

            again;

        do {


            again = false;


            if ( ! p.steiner && ( equals( p, p.next ) || area( p.prev, p, p.next ) === 0 ) ) {


                removeNode( p );

                p = end = p.prev;

                if ( p === p.next ) break;

                again = true;


            } else {


                p = p.next;


            }


        } while ( again || p !== end );


        return end;


    }


    // main ear slicing loop which triangulates a polygon (given as a linked list)

    function earcutLinked( ear, triangles, dim, minX, minY, invSize, pass ) {


        if ( ! ear ) return;


        // interlink polygon nodes in z-order

        if ( ! pass && invSize ) indexCurve( ear, minX, minY, invSize );


        let stop = ear,

            prev, next;


        // iterate through ears, slicing them one by one

        while ( ear.prev !== ear.next ) {


            prev = ear.prev;

            next = ear.next;


            if ( invSize ? isEarHashed( ear, minX, minY, invSize ) : isEar( ear ) ) {


                // cut off the triangle

                triangles.push( prev.i / dim | 0 );

                triangles.push( ear.i / dim | 0 );

                triangles.push( next.i / dim | 0 );


                removeNode( ear );


                // skipping the next vertex leads to less sliver triangles

                ear = next.next;

                stop = next.next;


                continue;


            }


            ear = next;


            // if we looped through the whole remaining polygon and can't find any more ears

            if ( ear === stop ) {


                // try filtering points and slicing again

                if ( ! pass ) {


                    earcutLinked( filterPoints( ear ), triangles, dim, minX, minY, invSize, 1 );


                    // if this didn't work, try curing all small self-intersections locally


                } else if ( pass === 1 ) {


                    ear = cureLocalIntersections( filterPoints( ear ), triangles, dim );

                    earcutLinked( ear, triangles, dim, minX, minY, invSize, 2 );


                    // as a last resort, try splitting the remaining polygon into two


                } else if ( pass === 2 ) {


                    splitEarcut( ear, triangles, dim, minX, minY, invSize );


                }


                break;


            }


        }


    }


    // check whether a polygon node forms a valid ear with adjacent nodes

    function isEar( ear ) {


        const a = ear.prev,

            b = ear,

            c = ear.next;


        if ( area( a, b, c ) >= 0 ) return false; // reflex, can't be an ear


        // now make sure we don't have other points inside the potential ear

        const ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y;


        // triangle bbox; min & max are calculated like this for speed

        const x0 = ax < bx ? ( ax < cx ? ax : cx ) : ( bx < cx ? bx : cx ),

            y0 = ay < by ? ( ay < cy ? ay : cy ) : ( by < cy ? by : cy ),

            x1 = ax > bx ? ( ax > cx ? ax : cx ) : ( bx > cx ? bx : cx ),

            y1 = ay > by ? ( ay > cy ? ay : cy ) : ( by > cy ? by : cy );


        let p = c.next;

        while ( p !== a ) {


            if ( p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 &&

                pointInTriangle( ax, ay, bx, by, cx, cy, p.x, p.y ) &&

                area( p.prev, p, p.next ) >= 0 ) return false;

            p = p.next;


        }


        return true;


    }


    function isEarHashed( ear, minX, minY, invSize ) {


        const a = ear.prev,

            b = ear,

            c = ear.next;


        if ( area( a, b, c ) >= 0 ) return false; // reflex, can't be an ear


        const ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y;


        // triangle bbox; min & max are calculated like this for speed

        const x0 = ax < bx ? ( ax < cx ? ax : cx ) : ( bx < cx ? bx : cx ),

            y0 = ay < by ? ( ay < cy ? ay : cy ) : ( by < cy ? by : cy ),

            x1 = ax > bx ? ( ax > cx ? ax : cx ) : ( bx > cx ? bx : cx ),

            y1 = ay > by ? ( ay > cy ? ay : cy ) : ( by > cy ? by : cy );


        // z-order range for the current triangle bbox;

        const minZ = zOrder( x0, y0, minX, minY, invSize ),

            maxZ = zOrder( x1, y1, minX, minY, invSize );


        let p = ear.prevZ,

            n = ear.nextZ;


        // look for points inside the triangle in both directions

        while ( p && p.z >= minZ && n && n.z <= maxZ ) {


            if ( p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c &&

                pointInTriangle( ax, ay, bx, by, cx, cy, p.x, p.y ) && area( p.prev, p, p.next ) >= 0 ) return false;

            p = p.prevZ;


            if ( n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c &&

                pointInTriangle( ax, ay, bx, by, cx, cy, n.x, n.y ) && area( n.prev, n, n.next ) >= 0 ) return false;

            n = n.nextZ;


        }


        // look for remaining points in decreasing z-order

        while ( p && p.z >= minZ ) {


            if ( p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c &&

                pointInTriangle( ax, ay, bx, by, cx, cy, p.x, p.y ) && area( p.prev, p, p.next ) >= 0 ) return false;

            p = p.prevZ;


        }


        // look for remaining points in increasing z-order

        while ( n && n.z <= maxZ ) {


            if ( n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c &&

                pointInTriangle( ax, ay, bx, by, cx, cy, n.x, n.y ) && area( n.prev, n, n.next ) >= 0 ) return false;

            n = n.nextZ;


        }


        return true;


    }


    // go through all polygon nodes and cure small local self-intersections

    function cureLocalIntersections( start, triangles, dim ) {


        let p = start;

        do {


            const a = p.prev,

                b = p.next.next;


            if ( ! equals( a, b ) && intersects( a, p, p.next, b ) && locallyInside( a, b ) && locallyInside( b, a ) ) {


                triangles.push( a.i / dim | 0 );

                triangles.push( p.i / dim | 0 );

                triangles.push( b.i / dim | 0 );


                // remove two nodes involved

                removeNode( p );

                removeNode( p.next );


                p = start = b;


            }


            p = p.next;


        } while ( p !== start );


        return filterPoints( p );


    }


    // try splitting polygon into two and triangulate them independently

    function splitEarcut( start, triangles, dim, minX, minY, invSize ) {


        // look for a valid diagonal that divides the polygon into two

        let a = start;

        do {


            let b = a.next.next;

            while ( b !== a.prev ) {


                if ( a.i !== b.i && isValidDiagonal( a, b ) ) {


                    // split the polygon in two by the diagonal

                    let c = splitPolygon( a, b );


                    // filter colinear points around the cuts

                    a = filterPoints( a, a.next );

                    c = filterPoints( c, c.next );


                    // run earcut on each half

                    earcutLinked( a, triangles, dim, minX, minY, invSize, 0 );

                    earcutLinked( c, triangles, dim, minX, minY, invSize, 0 );

                    return;


                }


                b = b.next;


            }


            a = a.next;


        } while ( a !== start );


    }


    // link every hole into the outer loop, producing a single-ring polygon without holes

    function eliminateHoles( data, holeIndices, outerNode, dim ) {


        const queue = [];

        let i, len, start, end, list;


        for ( i = 0, len = holeIndices.length; i < len; i ++ ) {


            start = holeIndices[ i ] * dim;

            end = i < len - 1 ? holeIndices[ i + 1 ] * dim : data.length;

            list = linkedList( data, start, end, dim, false );

            if ( list === list.next ) list.steiner = true;

            queue.push( getLeftmost( list ) );


        }


        queue.sort( compareX );


        // process holes from left to right

        for ( i = 0; i < queue.length; i ++ ) {


            outerNode = eliminateHole( queue[ i ], outerNode );


        }


        return outerNode;


    }


    function compareX( a, b ) {


        return a.x - b.x;


    }


    // find a bridge between vertices that connects hole with an outer ring and link it

    function eliminateHole( hole, outerNode ) {


        const bridge = findHoleBridge( hole, outerNode );

        if ( ! bridge ) {


            return outerNode;


        }


        const bridgeReverse = splitPolygon( bridge, hole );


        // filter collinear points around the cuts

        filterPoints( bridgeReverse, bridgeReverse.next );

        return filterPoints( bridge, bridge.next );


    }


    // David Eberly's algorithm for finding a bridge between hole and outer polygon

    function findHoleBridge( hole, outerNode ) {


        let p = outerNode,

            qx = - Infinity,

            m;


        const hx = hole.x, hy = hole.y;


        // find a segment intersected by a ray from the hole's leftmost point to the left;

        // segment's endpoint with lesser x will be potential connection point

        do {


            if ( hy <= p.y && hy >= p.next.y && p.next.y !== p.y ) {


                const x = p.x + ( hy - p.y ) * ( p.next.x - p.x ) / ( p.next.y - p.y );

                if ( x <= hx && x > qx ) {


                    qx = x;

                    m = p.x < p.next.x ? p : p.next;

                    if ( x === hx ) return m; // hole touches outer segment; pick leftmost endpoint


                }


            }


            p = p.next;


        } while ( p !== outerNode );


        if ( ! m ) return null;


        // look for points inside the triangle of hole point, segment intersection and endpoint;

        // if there are no points found, we have a valid connection;

        // otherwise choose the point of the minimum angle with the ray as connection point


        const stop = m,

            mx = m.x,

            my = m.y;

        let tanMin = Infinity, tan;


        p = m;


        do {


            if ( hx >= p.x && p.x >= mx && hx !== p.x &&

                    pointInTriangle( hy < my ? hx : qx, hy, mx, my, hy < my ? qx : hx, hy, p.x, p.y ) ) {


                tan = Math.abs( hy - p.y ) / ( hx - p.x ); // tangential


                if ( locallyInside( p, hole ) && ( tan < tanMin || ( tan === tanMin && ( p.x > m.x || ( p.x === m.x && sectorContainsSector( m, p ) ) ) ) ) ) {


                    m = p;

                    tanMin = tan;


                }


            }


            p = p.next;


        } while ( p !== stop );


        return m;


    }


    // whether sector in vertex m contains sector in vertex p in the same coordinates

    function sectorContainsSector( m, p ) {


        return area( m.prev, m, p.prev ) < 0 && area( p.next, m, m.next ) < 0;


    }


    // interlink polygon nodes in z-order

    function indexCurve( start, minX, minY, invSize ) {


        let p = start;

        do {


            if ( p.z === 0 ) p.z = zOrder( p.x, p.y, minX, minY, invSize );

            p.prevZ = p.prev;

            p.nextZ = p.next;

            p = p.next;


        } while ( p !== start );


        p.prevZ.nextZ = null;

        p.prevZ = null;


        sortLinked( p );


    }


    // Simon Tatham's linked list merge sort algorithm

    // http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html

    function sortLinked( list ) {


        let i, p, q, e, tail, numMerges, pSize, qSize,

            inSize = 1;


        do {


            p = list;

            list = null;

            tail = null;

            numMerges = 0;


            while ( p ) {


                numMerges ++;

                q = p;

                pSize = 0;

                for ( i = 0; i < inSize; i ++ ) {


                    pSize ++;

                    q = q.nextZ;

                    if ( ! q ) break;


                }


                qSize = inSize;


                while ( pSize > 0 || ( qSize > 0 && q ) ) {


                    if ( pSize !== 0 && ( qSize === 0 || ! q || p.z <= q.z ) ) {


                        e = p;

                        p = p.nextZ;

                        pSize --;


                    } else {


                        e = q;

                        q = q.nextZ;

                        qSize --;


                    }


                    if ( tail ) tail.nextZ = e;

                    else list = e;


                    e.prevZ = tail;

                    tail = e;


                }


                p = q;


            }


            tail.nextZ = null;

            inSize *= 2;


        } while ( numMerges > 1 );


        return list;


    }


    // z-order of a point given coords and inverse of the longer side of data bbox

    function zOrder( x, y, minX, minY, invSize ) {


        // coords are transformed into non-negative 15-bit integer range

        x = ( x - minX ) * invSize | 0;

        y = ( y - minY ) * invSize | 0;


        x = ( x | ( x << 8 ) ) & 0x00FF00FF;

        x = ( x | ( x << 4 ) ) & 0x0F0F0F0F;

        x = ( x | ( x << 2 ) ) & 0x33333333;

        x = ( x | ( x << 1 ) ) & 0x55555555;


        y = ( y | ( y << 8 ) ) & 0x00FF00FF;

        y = ( y | ( y << 4 ) ) & 0x0F0F0F0F;

        y = ( y | ( y << 2 ) ) & 0x33333333;

        y = ( y | ( y << 1 ) ) & 0x55555555;


        return x | ( y << 1 );


    }


    // find the leftmost node of a polygon ring

    function getLeftmost( start ) {


        let p = start,

            leftmost = start;

        do {


            if ( p.x < leftmost.x || ( p.x === leftmost.x && p.y < leftmost.y ) ) leftmost = p;

            p = p.next;


        } while ( p !== start );


        return leftmost;


    }


    // check if a point lies within a convex triangle

    function pointInTriangle( ax, ay, bx, by, cx, cy, px, py ) {


        return ( cx - px ) * ( ay - py ) >= ( ax - px ) * ( cy - py ) &&

               ( ax - px ) * ( by - py ) >= ( bx - px ) * ( ay - py ) &&

               ( bx - px ) * ( cy - py ) >= ( cx - px ) * ( by - py );


    }


    // check if a diagonal between two polygon nodes is valid (lies in polygon interior)

    function isValidDiagonal( a, b ) {


        return a.next.i !== b.i && a.prev.i !== b.i && ! intersectsPolygon( a, b ) && // dones't intersect other edges

               ( locallyInside( a, b ) && locallyInside( b, a ) && middleInside( a, b ) && // locally visible

                ( area( a.prev, a, b.prev ) || area( a, b.prev, b ) ) || // does not create opposite-facing sectors

                equals( a, b ) && area( a.prev, a, a.next ) > 0 && area( b.prev, b, b.next ) > 0 ); // special zero-length case


    }


    // signed area of a triangle

    function area( p, q, r ) {


        return ( q.y - p.y ) * ( r.x - q.x ) - ( q.x - p.x ) * ( r.y - q.y );


    }


    // check if two points are equal

    function equals( p1, p2 ) {


        return p1.x === p2.x && p1.y === p2.y;


    }


    // check if two segments intersect

    function intersects( p1, q1, p2, q2 ) {


        const o1 = sign( area( p1, q1, p2 ) );

        const o2 = sign( area( p1, q1, q2 ) );

        const o3 = sign( area( p2, q2, p1 ) );

        const o4 = sign( area( p2, q2, q1 ) );


        if ( o1 !== o2 && o3 !== o4 ) return true; // general case


        if ( o1 === 0 && onSegment( p1, p2, q1 ) ) return true; // p1, q1 and p2 are collinear and p2 lies on p1q1

        if ( o2 === 0 && onSegment( p1, q2, q1 ) ) return true; // p1, q1 and q2 are collinear and q2 lies on p1q1

        if ( o3 === 0 && onSegment( p2, p1, q2 ) ) return true; // p2, q2 and p1 are collinear and p1 lies on p2q2

        if ( o4 === 0 && onSegment( p2, q1, q2 ) ) return true; // p2, q2 and q1 are collinear and q1 lies on p2q2


        return false;


    }


    // for collinear points p, q, r, check if point q lies on segment pr

    function onSegment( p, q, r ) {


        return q.x <= Math.max( p.x, r.x ) && q.x >= Math.min( p.x, r.x ) && q.y <= Math.max( p.y, r.y ) && q.y >= Math.min( p.y, r.y );


    }


    function sign( num ) {


        return num > 0 ? 1 : num < 0 ? - 1 : 0;


    }


    // check if a polygon diagonal intersects any polygon segments

    function intersectsPolygon( a, b ) {


        let p = a;

        do {


            if ( p.i !== a.i && p.next.i !== a.i && p.i !== b.i && p.next.i !== b.i &&

                intersects( p, p.next, a, b ) ) return true;

            p = p.next;


        } while ( p !== a );


        return false;


    }


    // check if a polygon diagonal is locally inside the polygon

    function locallyInside( a, b ) {


        return area( a.prev, a, a.next ) < 0 ?

            area( a, b, a.next ) >= 0 && area( a, a.prev, b ) >= 0 :

            area( a, b, a.prev ) < 0 || area( a, a.next, b ) < 0;


    }


    // check if the middle point of a polygon diagonal is inside the polygon

    function middleInside( a, b ) {


        let p = a,

            inside = false;

        const px = ( a.x + b.x ) / 2,

            py = ( a.y + b.y ) / 2;

        do {


            if ( ( ( p.y > py ) !== ( p.next.y > py ) ) && p.next.y !== p.y &&

                ( px < ( p.next.x - p.x ) * ( py - p.y ) / ( p.next.y - p.y ) + p.x ) )

                inside = ! inside;

            p = p.next;


        } while ( p !== a );


        return inside;


    }


    // link two polygon vertices with a bridge; if the vertices belong to the same ring, it splits polygon into two;

    // if one belongs to the outer ring and another to a hole, it merges it into a single ring

    function splitPolygon( a, b ) {


        const a2 = new Node( a.i, a.x, a.y ),

            b2 = new Node( b.i, b.x, b.y ),

            an = a.next,

            bp = b.prev;


        a.next = b;

        b.prev = a;


        a2.next = an;

        an.prev = a2;


        b2.next = a2;

        a2.prev = b2;


        bp.next = b2;

        b2.prev = bp;


        return b2;


    }


    // create a node and optionally link it with previous one (in a circular doubly linked list)

    function insertNode( i, x, y, last ) {


        const p = new Node( i, x, y );


        if ( ! last ) {


            p.prev = p;

            p.next = p;


        } else {


            p.next = last.next;

            p.prev = last;

            last.next.prev = p;

            last.next = p;


        }


        return p;


    }


    function removeNode( p ) {


        p.next.prev = p.prev;

        p.prev.next = p.next;


        if ( p.prevZ ) p.prevZ.nextZ = p.nextZ;

        if ( p.nextZ ) p.nextZ.prevZ = p.prevZ;


    }


    function Node( i, x, y ) {


        // vertex index in coordinates array

        this.i = i;


        // vertex coordinates

        this.x = x;

        this.y = y;


        // previous and next vertex nodes in a polygon ring

        this.prev = null;

        this.next = null;


        // z-order curve value

        this.z = 0;


        // previous and next nodes in z-order

        this.prevZ = null;

        this.nextZ = null;


        // indicates whether this is a steiner point

        this.steiner = false;


    }


    function signedArea( data, start, end, dim ) {


        let sum = 0;

        for ( let i = start, j = end - dim; i < end; i += dim ) {


            sum += ( data[ j ] - data[ i ] ) * ( data[ i + 1 ] + data[ j + 1 ] );

            j = i;


        }


        return sum;


    }


    class ShapeUtils {


        // calculate area of the contour polygon


        static area( contour ) {


            const n = contour.length;

            let a = 0.0;


            for ( let p = n - 1, q = 0; q < n; p = q ++ ) {


                a += contour[ p ].x * contour[ q ].y - contour[ q ].x * contour[ p ].y;


            }


            return a * 0.5;


        }


        static isClockWise( pts ) {


            return ShapeUtils.area( pts ) < 0;


        }


        static triangulateShape( contour, holes ) {


            const vertices = []; // flat array of vertices like [ x0,y0, x1,y1, x2,y2, ... ]

            const holeIndices = []; // array of hole indices

            const faces = []; // final array of vertex indices like [ [ a,b,d ], [ b,c,d ] ]


            removeDupEndPts( contour );

            addContour( vertices, contour );


            //


            let holeIndex = contour.length;


            holes.forEach( removeDupEndPts );


            for ( let i = 0; i < holes.length; i ++ ) {


                holeIndices.push( holeIndex );

                holeIndex += holes[ i ].length;

                addContour( vertices, holes[ i ] );


            }


            //


            const triangles = Earcut.triangulate( vertices, holeIndices );


            //


            for ( let i = 0; i < triangles.length; i += 3 ) {


                faces.push( triangles.slice( i, i + 3 ) );


            }


            return faces;


        }


    }


    function removeDupEndPts( points ) {


        const l = points.length;


        if ( l > 2 && points[ l - 1 ].equals( points[ 0 ] ) ) {


            points.pop();


        }


    }


    function addContour( vertices, contour ) {


        for ( let i = 0; i < contour.length; i ++ ) {


            vertices.push( contour[ i ].x );

            vertices.push( contour[ i ].y );


        }


    }


    class ExtrudeGeometry extends BufferGeometry {


        constructor( shapes = new Shape( [ new Vector2( 0.5, 0.5 ), new Vector2( - 0.5, 0.5 ), new Vector2( - 0.5, - 0.5 ), new Vector2( 0.5, - 0.5 ) ] ), options = {} ) {


            super();


            this.type = 'ExtrudeGeometry';


            this.parameters = {

                shapes: shapes,

                options: options

            };


            shapes = Array.isArray( shapes ) ? shapes : [ shapes ];


            const scope = this;


            const verticesArray = [];

            const uvArray = [];


            for ( let i = 0, l = shapes.length; i < l; i ++ ) {


                const shape = shapes[ i ];

                addShape( shape );


            }


            // build geometry


            this.setAttribute( 'position', new Float32BufferAttribute( verticesArray, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvArray, 2 ) );


            this.computeVertexNormals();


            // functions


            function addShape( shape ) {


                const placeholder = [];


                // options


                const curveSegments = options.curveSegments !== undefined ? options.curveSegments : 12;

                const steps = options.steps !== undefined ? options.steps : 1;

                const depth = options.depth !== undefined ? options.depth : 1;


                let bevelEnabled = options.bevelEnabled !== undefined ? options.bevelEnabled : true;

                let bevelThickness = options.bevelThickness !== undefined ? options.bevelThickness : 0.2;

                let bevelSize = options.bevelSize !== undefined ? options.bevelSize : bevelThickness - 0.1;

                let bevelOffset = options.bevelOffset !== undefined ? options.bevelOffset : 0;

                let bevelSegments = options.bevelSegments !== undefined ? options.bevelSegments : 3;


                const extrudePath = options.extrudePath;


                const uvgen = options.UVGenerator !== undefined ? options.UVGenerator : WorldUVGenerator;


                //


                let extrudePts, extrudeByPath = false;

                let splineTube, binormal, normal, position2;


                if ( extrudePath ) {


                    extrudePts = extrudePath.getSpacedPoints( steps );


                    extrudeByPath = true;

                    bevelEnabled = false; // bevels not supported for path extrusion


                    // SETUP TNB variables


                    // TODO1 - have a .isClosed in spline?


                    splineTube = extrudePath.computeFrenetFrames( steps, false );


                    // console.log(splineTube, 'splineTube', splineTube.normals.length, 'steps', steps, 'extrudePts', extrudePts.length);


                    binormal = new Vector3();

                    normal = new Vector3();

                    position2 = new Vector3();


                }


                // Safeguards if bevels are not enabled


                if ( ! bevelEnabled ) {


                    bevelSegments = 0;

                    bevelThickness = 0;

                    bevelSize = 0;

                    bevelOffset = 0;


                }


                // Variables initialization


                const shapePoints = shape.extractPoints( curveSegments );


                let vertices = shapePoints.shape;

                const holes = shapePoints.holes;


                const reverse = ! ShapeUtils.isClockWise( vertices );


                if ( reverse ) {


                    vertices = vertices.reverse();


                    // Maybe we should also check if holes are in the opposite direction, just to be safe ...


                    for ( let h = 0, hl = holes.length; h < hl; h ++ ) {


                        const ahole = holes[ h ];


                        if ( ShapeUtils.isClockWise( ahole ) ) {


                            holes[ h ] = ahole.reverse();


                        }


                    }


                }


                const faces = ShapeUtils.triangulateShape( vertices, holes );


                /* Vertices */


                const contour = vertices; // vertices has all points but contour has only points of circumference


                for ( let h = 0, hl = holes.length; h < hl; h ++ ) {


                    const ahole = holes[ h ];


                    vertices = vertices.concat( ahole );


                }


                function scalePt2( pt, vec, size ) {


                    if ( ! vec ) console.error( 'THREE.ExtrudeGeometry: vec does not exist' );


                    return pt.clone().addScaledVector( vec, size );


                }


                const vlen = vertices.length, flen = faces.length;


                // Find directions for point movement


                function getBevelVec( inPt, inPrev, inNext ) {


                    // computes for inPt the corresponding point inPt' on a new contour

                    //   shifted by 1 unit (length of normalized vector) to the left

                    // if we walk along contour clockwise, this new contour is outside the old one

                    //

                    // inPt' is the intersection of the two lines parallel to the two

                    //  adjacent edges of inPt at a distance of 1 unit on the left side.


                    let v_trans_x, v_trans_y, shrink_by; // resulting translation vector for inPt


                    // good reading for geometry algorithms (here: line-line intersection)

                    // http://geomalgorithms.com/a05-_intersect-1.html


                    const v_prev_x = inPt.x - inPrev.x,

                        v_prev_y = inPt.y - inPrev.y;

                    const v_next_x = inNext.x - inPt.x,

                        v_next_y = inNext.y - inPt.y;


                    const v_prev_lensq = ( v_prev_x * v_prev_x + v_prev_y * v_prev_y );


                    // check for collinear edges

                    const collinear0 = ( v_prev_x * v_next_y - v_prev_y * v_next_x );


                    if ( Math.abs( collinear0 ) > Number.EPSILON ) {


                        // not collinear


                        // length of vectors for normalizing


                        const v_prev_len = Math.sqrt( v_prev_lensq );

                        const v_next_len = Math.sqrt( v_next_x * v_next_x + v_next_y * v_next_y );


                        // shift adjacent points by unit vectors to the left


                        const ptPrevShift_x = ( inPrev.x - v_prev_y / v_prev_len );

                        const ptPrevShift_y = ( inPrev.y + v_prev_x / v_prev_len );


                        const ptNextShift_x = ( inNext.x - v_next_y / v_next_len );

                        const ptNextShift_y = ( inNext.y + v_next_x / v_next_len );


                        // scaling factor for v_prev to intersection point


                        const sf = ( ( ptNextShift_x - ptPrevShift_x ) * v_next_y -

                                ( ptNextShift_y - ptPrevShift_y ) * v_next_x ) /

                            ( v_prev_x * v_next_y - v_prev_y * v_next_x );


                        // vector from inPt to intersection point


                        v_trans_x = ( ptPrevShift_x + v_prev_x * sf - inPt.x );

                        v_trans_y = ( ptPrevShift_y + v_prev_y * sf - inPt.y );


                        // Don't normalize!, otherwise sharp corners become ugly

                        //  but prevent crazy spikes

                        const v_trans_lensq = ( v_trans_x * v_trans_x + v_trans_y * v_trans_y );

                        if ( v_trans_lensq <= 2 ) {


                            return new Vector2( v_trans_x, v_trans_y );


                        } else {


                            shrink_by = Math.sqrt( v_trans_lensq / 2 );


                        }


                    } else {


                        // handle special case of collinear edges


                        let direction_eq = false; // assumes: opposite


                        if ( v_prev_x > Number.EPSILON ) {


                            if ( v_next_x > Number.EPSILON ) {


                                direction_eq = true;


                            }


                        } else {


                            if ( v_prev_x < - Number.EPSILON ) {


                                if ( v_next_x < - Number.EPSILON ) {


                                    direction_eq = true;


                                }


                            } else {


                                if ( Math.sign( v_prev_y ) === Math.sign( v_next_y ) ) {


                                    direction_eq = true;


                                }


                            }


                        }


                        if ( direction_eq ) {


                            // console.log("Warning: lines are a straight sequence");

                            v_trans_x = - v_prev_y;

                            v_trans_y = v_prev_x;

                            shrink_by = Math.sqrt( v_prev_lensq );


                        } else {


                            // console.log("Warning: lines are a straight spike");

                            v_trans_x = v_prev_x;

                            v_trans_y = v_prev_y;

                            shrink_by = Math.sqrt( v_prev_lensq / 2 );


                        }


                    }


                    return new Vector2( v_trans_x / shrink_by, v_trans_y / shrink_by );


                }


                const contourMovements = [];


                for ( let i = 0, il = contour.length, j = il - 1, k = i + 1; i < il; i ++, j ++, k ++ ) {


                    if ( j === il ) j = 0;

                    if ( k === il ) k = 0;


                    //  (j)---(i)---(k)

                    // console.log('i,j,k', i, j , k)


                    contourMovements[ i ] = getBevelVec( contour[ i ], contour[ j ], contour[ k ] );


                }


                const holesMovements = [];

                let oneHoleMovements, verticesMovements = contourMovements.concat();


                for ( let h = 0, hl = holes.length; h < hl; h ++ ) {


                    const ahole = holes[ h ];


                    oneHoleMovements = [];


                    for ( let i = 0, il = ahole.length, j = il - 1, k = i + 1; i < il; i ++, j ++, k ++ ) {


                        if ( j === il ) j = 0;

                        if ( k === il ) k = 0;


                        //  (j)---(i)---(k)

                        oneHoleMovements[ i ] = getBevelVec( ahole[ i ], ahole[ j ], ahole[ k ] );


                    }


                    holesMovements.push( oneHoleMovements );

                    verticesMovements = verticesMovements.concat( oneHoleMovements );


                }


                // Loop bevelSegments, 1 for the front, 1 for the back


                for ( let b = 0; b < bevelSegments; b ++ ) {


                    //for ( b = bevelSegments; b > 0; b -- ) {


                    const t = b / bevelSegments;

                    const z = bevelThickness * Math.cos( t * Math.PI / 2 );

                    const bs = bevelSize * Math.sin( t * Math.PI / 2 ) + bevelOffset;


                    // contract shape


                    for ( let i = 0, il = contour.length; i < il; i ++ ) {


                        const vert = scalePt2( contour[ i ], contourMovements[ i ], bs );


                        v( vert.x, vert.y, - z );


                    }


                    // expand holes


                    for ( let h = 0, hl = holes.length; h < hl; h ++ ) {


                        const ahole = holes[ h ];

                        oneHoleMovements = holesMovements[ h ];


                        for ( let i = 0, il = ahole.length; i < il; i ++ ) {


                            const vert = scalePt2( ahole[ i ], oneHoleMovements[ i ], bs );


                            v( vert.x, vert.y, - z );


                        }


                    }


                }


                const bs = bevelSize + bevelOffset;


                // Back facing vertices


                for ( let i = 0; i < vlen; i ++ ) {


                    const vert = bevelEnabled ? scalePt2( vertices[ i ], verticesMovements[ i ], bs ) : vertices[ i ];


                    if ( ! extrudeByPath ) {


                        v( vert.x, vert.y, 0 );


                    } else {


                        // v( vert.x, vert.y + extrudePts[ 0 ].y, extrudePts[ 0 ].x );


                        normal.copy( splineTube.normals[ 0 ] ).multiplyScalar( vert.x );

                        binormal.copy( splineTube.binormals[ 0 ] ).multiplyScalar( vert.y );


                        position2.copy( extrudePts[ 0 ] ).add( normal ).add( binormal );


                        v( position2.x, position2.y, position2.z );


                    }


                }


                // Add stepped vertices...

                // Including front facing vertices


                for ( let s = 1; s <= steps; s ++ ) {


                    for ( let i = 0; i < vlen; i ++ ) {


                        const vert = bevelEnabled ? scalePt2( vertices[ i ], verticesMovements[ i ], bs ) : vertices[ i ];


                        if ( ! extrudeByPath ) {


                            v( vert.x, vert.y, depth / steps * s );


                        } else {


                            // v( vert.x, vert.y + extrudePts[ s - 1 ].y, extrudePts[ s - 1 ].x );


                            normal.copy( splineTube.normals[ s ] ).multiplyScalar( vert.x );

                            binormal.copy( splineTube.binormals[ s ] ).multiplyScalar( vert.y );


                            position2.copy( extrudePts[ s ] ).add( normal ).add( binormal );


                            v( position2.x, position2.y, position2.z );


                        }


                    }


                }


                // Add bevel segments planes


                //for ( b = 1; b <= bevelSegments; b ++ ) {

                for ( let b = bevelSegments - 1; b >= 0; b -- ) {


                    const t = b / bevelSegments;

                    const z = bevelThickness * Math.cos( t * Math.PI / 2 );

                    const bs = bevelSize * Math.sin( t * Math.PI / 2 ) + bevelOffset;


                    // contract shape


                    for ( let i = 0, il = contour.length; i < il; i ++ ) {


                        const vert = scalePt2( contour[ i ], contourMovements[ i ], bs );

                        v( vert.x, vert.y, depth + z );


                    }


                    // expand holes


                    for ( let h = 0, hl = holes.length; h < hl; h ++ ) {


                        const ahole = holes[ h ];

                        oneHoleMovements = holesMovements[ h ];


                        for ( let i = 0, il = ahole.length; i < il; i ++ ) {


                            const vert = scalePt2( ahole[ i ], oneHoleMovements[ i ], bs );


                            if ( ! extrudeByPath ) {


                                v( vert.x, vert.y, depth + z );


                            } else {


                                v( vert.x, vert.y + extrudePts[ steps - 1 ].y, extrudePts[ steps - 1 ].x + z );


                            }


                        }


                    }


                }


                /* Faces */


                // Top and bottom faces


                buildLidFaces();


                // Sides faces


                buildSideFaces();


                function buildLidFaces() {


                    const start = verticesArray.length / 3;


                    if ( bevelEnabled ) {


                        let layer = 0; // steps + 1

                        let offset = vlen * layer;


                        // Bottom faces


                        for ( let i = 0; i < flen; i ++ ) {


                            const face = faces[ i ];

                            f3( face[ 2 ] + offset, face[ 1 ] + offset, face[ 0 ] + offset );


                        }


                        layer = steps + bevelSegments * 2;

                        offset = vlen * layer;


                        // Top faces


                        for ( let i = 0; i < flen; i ++ ) {


                            const face = faces[ i ];

                            f3( face[ 0 ] + offset, face[ 1 ] + offset, face[ 2 ] + offset );


                        }


                    } else {


                        // Bottom faces


                        for ( let i = 0; i < flen; i ++ ) {


                            const face = faces[ i ];

                            f3( face[ 2 ], face[ 1 ], face[ 0 ] );


                        }


                        // Top faces


                        for ( let i = 0; i < flen; i ++ ) {


                            const face = faces[ i ];

                            f3( face[ 0 ] + vlen * steps, face[ 1 ] + vlen * steps, face[ 2 ] + vlen * steps );


                        }


                    }


                    scope.addGroup( start, verticesArray.length / 3 - start, 0 );


                }


                // Create faces for the z-sides of the shape


                function buildSideFaces() {


                    const start = verticesArray.length / 3;

                    let layeroffset = 0;

                    sidewalls( contour, layeroffset );

                    layeroffset += contour.length;


                    for ( let h = 0, hl = holes.length; h < hl; h ++ ) {


                        const ahole = holes[ h ];

                        sidewalls( ahole, layeroffset );


                        //, true

                        layeroffset += ahole.length;


                    }


                    scope.addGroup( start, verticesArray.length / 3 - start, 1 );


                }


                function sidewalls( contour, layeroffset ) {


                    let i = contour.length;


                    while ( -- i >= 0 ) {


                        const j = i;

                        let k = i - 1;

                        if ( k < 0 ) k = contour.length - 1;


                        //console.log('b', i,j, i-1, k,vertices.length);


                        for ( let s = 0, sl = ( steps + bevelSegments * 2 ); s < sl; s ++ ) {


                            const slen1 = vlen * s;

                            const slen2 = vlen * ( s + 1 );


                            const a = layeroffset + j + slen1,

                                b = layeroffset + k + slen1,

                                c = layeroffset + k + slen2,

                                d = layeroffset + j + slen2;


                            f4( a, b, c, d );


                        }


                    }


                }


                function v( x, y, z ) {


                    placeholder.push( x );

                    placeholder.push( y );

                    placeholder.push( z );


                }


                function f3( a, b, c ) {


                    addVertex( a );

                    addVertex( b );

                    addVertex( c );


                    const nextIndex = verticesArray.length / 3;

                    const uvs = uvgen.generateTopUV( scope, verticesArray, nextIndex - 3, nextIndex - 2, nextIndex - 1 );


                    addUV( uvs[ 0 ] );

                    addUV( uvs[ 1 ] );

                    addUV( uvs[ 2 ] );


                }


                function f4( a, b, c, d ) {


                    addVertex( a );

                    addVertex( b );

                    addVertex( d );


                    addVertex( b );

                    addVertex( c );

                    addVertex( d );


                    const nextIndex = verticesArray.length / 3;

                    const uvs = uvgen.generateSideWallUV( scope, verticesArray, nextIndex - 6, nextIndex - 3, nextIndex - 2, nextIndex - 1 );


                    addUV( uvs[ 0 ] );

                    addUV( uvs[ 1 ] );

                    addUV( uvs[ 3 ] );


                    addUV( uvs[ 1 ] );

                    addUV( uvs[ 2 ] );

                    addUV( uvs[ 3 ] );


                }


                function addVertex( index ) {


                    verticesArray.push( placeholder[ index * 3 + 0 ] );

                    verticesArray.push( placeholder[ index * 3 + 1 ] );

                    verticesArray.push( placeholder[ index * 3 + 2 ] );


                }


                function addUV( vector2 ) {


                    uvArray.push( vector2.x );

                    uvArray.push( vector2.y );


                }


            }


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            const shapes = this.parameters.shapes;

            const options = this.parameters.options;


            return toJSON$1( shapes, options, data );


        }


        static fromJSON( data, shapes ) {


            const geometryShapes = [];


            for ( let j = 0, jl = data.shapes.length; j < jl; j ++ ) {


                const shape = shapes[ data.shapes[ j ] ];


                geometryShapes.push( shape );


            }


            const extrudePath = data.options.extrudePath;


            if ( extrudePath !== undefined ) {


                data.options.extrudePath = new Curves[ extrudePath.type ]().fromJSON( extrudePath );


            }


            return new ExtrudeGeometry( geometryShapes, data.options );


        }


    }


    const WorldUVGenerator = {


        generateTopUV: function ( geometry, vertices, indexA, indexB, indexC ) {


            const a_x = vertices[ indexA * 3 ];

            const a_y = vertices[ indexA * 3 + 1 ];

            const b_x = vertices[ indexB * 3 ];

            const b_y = vertices[ indexB * 3 + 1 ];

            const c_x = vertices[ indexC * 3 ];

            const c_y = vertices[ indexC * 3 + 1 ];


            return [

                new Vector2( a_x, a_y ),

                new Vector2( b_x, b_y ),

                new Vector2( c_x, c_y )

            ];


        },


        generateSideWallUV: function ( geometry, vertices, indexA, indexB, indexC, indexD ) {


            const a_x = vertices[ indexA * 3 ];

            const a_y = vertices[ indexA * 3 + 1 ];

            const a_z = vertices[ indexA * 3 + 2 ];

            const b_x = vertices[ indexB * 3 ];

            const b_y = vertices[ indexB * 3 + 1 ];

            const b_z = vertices[ indexB * 3 + 2 ];

            const c_x = vertices[ indexC * 3 ];

            const c_y = vertices[ indexC * 3 + 1 ];

            const c_z = vertices[ indexC * 3 + 2 ];

            const d_x = vertices[ indexD * 3 ];

            const d_y = vertices[ indexD * 3 + 1 ];

            const d_z = vertices[ indexD * 3 + 2 ];


            if ( Math.abs( a_y - b_y ) < Math.abs( a_x - b_x ) ) {


                return [

                    new Vector2( a_x, 1 - a_z ),

                    new Vector2( b_x, 1 - b_z ),

                    new Vector2( c_x, 1 - c_z ),

                    new Vector2( d_x, 1 - d_z )

                ];


            } else {


                return [

                    new Vector2( a_y, 1 - a_z ),

                    new Vector2( b_y, 1 - b_z ),

                    new Vector2( c_y, 1 - c_z ),

                    new Vector2( d_y, 1 - d_z )

                ];


            }


        }


    };


    function toJSON$1( shapes, options, data ) {


        data.shapes = [];


        if ( Array.isArray( shapes ) ) {


            for ( let i = 0, l = shapes.length; i < l; i ++ ) {


                const shape = shapes[ i ];


                data.shapes.push( shape.uuid );


            }


        } else {


            data.shapes.push( shapes.uuid );


        }


        data.options = Object.assign( {}, options );


        if ( options.extrudePath !== undefined ) data.options.extrudePath = options.extrudePath.toJSON();


        return data;


    }


    class IcosahedronGeometry extends PolyhedronGeometry {


        constructor( radius = 1, detail = 0 ) {


            const t = ( 1 + Math.sqrt( 5 ) ) / 2;


            const vertices = [

                - 1, t, 0,  1, t, 0,    - 1, - t, 0,    1, - t, 0,

                0, - 1, t,  0, 1, t,    0, - 1, - t,    0, 1, - t,

                t, 0, - 1,  t, 0, 1,    - t, 0, - 1,    - t, 0, 1

            ];


            const indices = [

                0, 11, 5,   0, 5, 1,    0, 1, 7,    0, 7, 10,   0, 10, 11,

                1, 5, 9,    5, 11, 4,   11, 10, 2,  10, 7, 6,   7, 1, 8,

                3, 9, 4,    3, 4, 2,    3, 2, 6,    3, 6, 8,    3, 8, 9,

                4, 9, 5,    2, 4, 11,   6, 2, 10,   8, 6, 7,    9, 8, 1

            ];


            super( vertices, indices, radius, detail );


            this.type = 'IcosahedronGeometry';


            this.parameters = {

                radius: radius,

                detail: detail

            };


        }


        static fromJSON( data ) {


            return new IcosahedronGeometry( data.radius, data.detail );


        }


    }


    class OctahedronGeometry extends PolyhedronGeometry {


        constructor( radius = 1, detail = 0 ) {


            const vertices = [

                1, 0, 0,    - 1, 0, 0,  0, 1, 0,

                0, - 1, 0,  0, 0, 1,    0, 0, - 1

            ];


            const indices = [

                0, 2, 4,    0, 4, 3,    0, 3, 5,

                0, 5, 2,    1, 2, 5,    1, 5, 3,

                1, 3, 4,    1, 4, 2

            ];


            super( vertices, indices, radius, detail );


            this.type = 'OctahedronGeometry';


            this.parameters = {

                radius: radius,

                detail: detail

            };


        }


        static fromJSON( data ) {


            return new OctahedronGeometry( data.radius, data.detail );


        }


    }


    class RingGeometry extends BufferGeometry {


        constructor( innerRadius = 0.5, outerRadius = 1, thetaSegments = 32, phiSegments = 1, thetaStart = 0, thetaLength = Math.PI * 2 ) {


            super();


            this.type = 'RingGeometry';


            this.parameters = {

                innerRadius: innerRadius,

                outerRadius: outerRadius,

                thetaSegments: thetaSegments,

                phiSegments: phiSegments,

                thetaStart: thetaStart,

                thetaLength: thetaLength

            };


            thetaSegments = Math.max( 3, thetaSegments );

            phiSegments = Math.max( 1, phiSegments );


            // buffers


            const indices = [];

            const vertices = [];

            const normals = [];

            const uvs = [];


            // some helper variables


            let radius = innerRadius;

            const radiusStep = ( ( outerRadius - innerRadius ) / phiSegments );

            const vertex = new Vector3();

            const uv = new Vector2();


            // generate vertices, normals and uvs


            for ( let j = 0; j <= phiSegments; j ++ ) {


                for ( let i = 0; i <= thetaSegments; i ++ ) {


                    // values are generate from the inside of the ring to the outside


                    const segment = thetaStart + i / thetaSegments * thetaLength;


                    // vertex


                    vertex.x = radius * Math.cos( segment );

                    vertex.y = radius * Math.sin( segment );


                    vertices.push( vertex.x, vertex.y, vertex.z );


                    // normal


                    normals.push( 0, 0, 1 );


                    // uv


                    uv.x = ( vertex.x / outerRadius + 1 ) / 2;

                    uv.y = ( vertex.y / outerRadius + 1 ) / 2;


                    uvs.push( uv.x, uv.y );


                }


                // increase the radius for next row of vertices


                radius += radiusStep;


            }


            // indices


            for ( let j = 0; j < phiSegments; j ++ ) {


                const thetaSegmentLevel = j * ( thetaSegments + 1 );


                for ( let i = 0; i < thetaSegments; i ++ ) {


                    const segment = i + thetaSegmentLevel;


                    const a = segment;

                    const b = segment + thetaSegments + 1;

                    const c = segment + thetaSegments + 2;

                    const d = segment + 1;


                    // faces


                    indices.push( a, b, d );

                    indices.push( b, c, d );


                }


            }


            // build geometry


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        static fromJSON( data ) {


            return new RingGeometry( data.innerRadius, data.outerRadius, data.thetaSegments, data.phiSegments, data.thetaStart, data.thetaLength );


        }


    }


    class ShapeGeometry extends BufferGeometry {


        constructor( shapes = new Shape( [ new Vector2( 0, 0.5 ), new Vector2( - 0.5, - 0.5 ), new Vector2( 0.5, - 0.5 ) ] ), curveSegments = 12 ) {


            super();


            this.type = 'ShapeGeometry';


            this.parameters = {

                shapes: shapes,

                curveSegments: curveSegments

            };


            // buffers


            const indices = [];

            const vertices = [];

            const normals = [];

            const uvs = [];


            // helper variables


            let groupStart = 0;

            let groupCount = 0;


            // allow single and array values for "shapes" parameter


            if ( Array.isArray( shapes ) === false ) {


                addShape( shapes );


            } else {


                for ( let i = 0; i < shapes.length; i ++ ) {


                    addShape( shapes[ i ] );


                    this.addGroup( groupStart, groupCount, i ); // enables MultiMaterial support


                    groupStart += groupCount;

                    groupCount = 0;


                }


            }


            // build geometry


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


            // helper functions


            function addShape( shape ) {


                const indexOffset = vertices.length / 3;

                const points = shape.extractPoints( curveSegments );


                let shapeVertices = points.shape;

                const shapeHoles = points.holes;


                // check direction of vertices


                if ( ShapeUtils.isClockWise( shapeVertices ) === false ) {


                    shapeVertices = shapeVertices.reverse();


                }


                for ( let i = 0, l = shapeHoles.length; i < l; i ++ ) {


                    const shapeHole = shapeHoles[ i ];


                    if ( ShapeUtils.isClockWise( shapeHole ) === true ) {


                        shapeHoles[ i ] = shapeHole.reverse();


                    }


                }


                const faces = ShapeUtils.triangulateShape( shapeVertices, shapeHoles );


                // join vertices of inner and outer paths to a single array


                for ( let i = 0, l = shapeHoles.length; i < l; i ++ ) {


                    const shapeHole = shapeHoles[ i ];

                    shapeVertices = shapeVertices.concat( shapeHole );


                }


                // vertices, normals, uvs


                for ( let i = 0, l = shapeVertices.length; i < l; i ++ ) {


                    const vertex = shapeVertices[ i ];


                    vertices.push( vertex.x, vertex.y, 0 );

                    normals.push( 0, 0, 1 );

                    uvs.push( vertex.x, vertex.y ); // world uvs


                }


                // indices


                for ( let i = 0, l = faces.length; i < l; i ++ ) {


                    const face = faces[ i ];


                    const a = face[ 0 ] + indexOffset;

                    const b = face[ 1 ] + indexOffset;

                    const c = face[ 2 ] + indexOffset;


                    indices.push( a, b, c );

                    groupCount += 3;


                }


            }


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            const shapes = this.parameters.shapes;


            return toJSON( shapes, data );


        }


        static fromJSON( data, shapes ) {


            const geometryShapes = [];


            for ( let j = 0, jl = data.shapes.length; j < jl; j ++ ) {


                const shape = shapes[ data.shapes[ j ] ];


                geometryShapes.push( shape );


            }


            return new ShapeGeometry( geometryShapes, data.curveSegments );


        }


    }


    function toJSON( shapes, data ) {


        data.shapes = [];


        if ( Array.isArray( shapes ) ) {


            for ( let i = 0, l = shapes.length; i < l; i ++ ) {


                const shape = shapes[ i ];


                data.shapes.push( shape.uuid );


            }


        } else {


            data.shapes.push( shapes.uuid );


        }


        return data;


    }


    class SphereGeometry extends BufferGeometry {


        constructor( radius = 1, widthSegments = 32, heightSegments = 16, phiStart = 0, phiLength = Math.PI * 2, thetaStart = 0, thetaLength = Math.PI ) {


            super();


            this.type = 'SphereGeometry';


            this.parameters = {

                radius: radius,

                widthSegments: widthSegments,

                heightSegments: heightSegments,

                phiStart: phiStart,

                phiLength: phiLength,

                thetaStart: thetaStart,

                thetaLength: thetaLength

            };


            widthSegments = Math.max( 3, Math.floor( widthSegments ) );

            heightSegments = Math.max( 2, Math.floor( heightSegments ) );


            const thetaEnd = Math.min( thetaStart + thetaLength, Math.PI );


            let index = 0;

            const grid = [];


            const vertex = new Vector3();

            const normal = new Vector3();


            // buffers


            const indices = [];

            const vertices = [];

            const normals = [];

            const uvs = [];


            // generate vertices, normals and uvs


            for ( let iy = 0; iy <= heightSegments; iy ++ ) {


                const verticesRow = [];


                const v = iy / heightSegments;


                // special case for the poles


                let uOffset = 0;


                if ( iy === 0 && thetaStart === 0 ) {


                    uOffset = 0.5 / widthSegments;


                } else if ( iy === heightSegments && thetaEnd === Math.PI ) {


                    uOffset = - 0.5 / widthSegments;


                }


                for ( let ix = 0; ix <= widthSegments; ix ++ ) {


                    const u = ix / widthSegments;


                    // vertex


                    vertex.x = - radius * Math.cos( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );

                    vertex.y = radius * Math.cos( thetaStart + v * thetaLength );

                    vertex.z = radius * Math.sin( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );


                    vertices.push( vertex.x, vertex.y, vertex.z );


                    // normal


                    normal.copy( vertex ).normalize();

                    normals.push( normal.x, normal.y, normal.z );


                    // uv


                    uvs.push( u + uOffset, 1 - v );


                    verticesRow.push( index ++ );


                }


                grid.push( verticesRow );


            }


            // indices


            for ( let iy = 0; iy < heightSegments; iy ++ ) {


                for ( let ix = 0; ix < widthSegments; ix ++ ) {


                    const a = grid[ iy ][ ix + 1 ];

                    const b = grid[ iy ][ ix ];

                    const c = grid[ iy + 1 ][ ix ];

                    const d = grid[ iy + 1 ][ ix + 1 ];


                    if ( iy !== 0 || thetaStart > 0 ) indices.push( a, b, d );

                    if ( iy !== heightSegments - 1 || thetaEnd < Math.PI ) indices.push( b, c, d );


                }


            }


            // build geometry


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        static fromJSON( data ) {


            return new SphereGeometry( data.radius, data.widthSegments, data.heightSegments, data.phiStart, data.phiLength, data.thetaStart, data.thetaLength );


        }


    }


    class TetrahedronGeometry extends PolyhedronGeometry {


        constructor( radius = 1, detail = 0 ) {


            const vertices = [

                1, 1, 1,    - 1, - 1, 1,    - 1, 1, - 1,    1, - 1, - 1

            ];


            const indices = [

                2, 1, 0,    0, 3, 2,    1, 3, 0,    2, 3, 1

            ];


            super( vertices, indices, radius, detail );


            this.type = 'TetrahedronGeometry';


            this.parameters = {

                radius: radius,

                detail: detail

            };


        }


        static fromJSON( data ) {


            return new TetrahedronGeometry( data.radius, data.detail );


        }


    }


    class TorusGeometry extends BufferGeometry {


        constructor( radius = 1, tube = 0.4, radialSegments = 12, tubularSegments = 48, arc = Math.PI * 2 ) {


            super();


            this.type = 'TorusGeometry';


            this.parameters = {

                radius: radius,

                tube: tube,

                radialSegments: radialSegments,

                tubularSegments: tubularSegments,

                arc: arc

            };


            radialSegments = Math.floor( radialSegments );

            tubularSegments = Math.floor( tubularSegments );


            // buffers


            const indices = [];

            const vertices = [];

            const normals = [];

            const uvs = [];


            // helper variables


            const center = new Vector3();

            const vertex = new Vector3();

            const normal = new Vector3();


            // generate vertices, normals and uvs


            for ( let j = 0; j <= radialSegments; j ++ ) {


                for ( let i = 0; i <= tubularSegments; i ++ ) {


                    const u = i / tubularSegments * arc;

                    const v = j / radialSegments * Math.PI * 2;


                    // vertex


                    vertex.x = ( radius + tube * Math.cos( v ) ) * Math.cos( u );

                    vertex.y = ( radius + tube * Math.cos( v ) ) * Math.sin( u );

                    vertex.z = tube * Math.sin( v );


                    vertices.push( vertex.x, vertex.y, vertex.z );


                    // normal


                    center.x = radius * Math.cos( u );

                    center.y = radius * Math.sin( u );

                    normal.subVectors( vertex, center ).normalize();


                    normals.push( normal.x, normal.y, normal.z );


                    // uv


                    uvs.push( i / tubularSegments );

                    uvs.push( j / radialSegments );


                }


            }


            // generate indices


            for ( let j = 1; j <= radialSegments; j ++ ) {


                for ( let i = 1; i <= tubularSegments; i ++ ) {


                    // indices


                    const a = ( tubularSegments + 1 ) * j + i - 1;

                    const b = ( tubularSegments + 1 ) * ( j - 1 ) + i - 1;

                    const c = ( tubularSegments + 1 ) * ( j - 1 ) + i;

                    const d = ( tubularSegments + 1 ) * j + i;


                    // faces


                    indices.push( a, b, d );

                    indices.push( b, c, d );


                }


            }


            // build geometry


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        static fromJSON( data ) {


            return new TorusGeometry( data.radius, data.tube, data.radialSegments, data.tubularSegments, data.arc );


        }


    }


    class TorusKnotGeometry extends BufferGeometry {


        constructor( radius = 1, tube = 0.4, tubularSegments = 64, radialSegments = 8, p = 2, q = 3 ) {


            super();


            this.type = 'TorusKnotGeometry';


            this.parameters = {

                radius: radius,

                tube: tube,

                tubularSegments: tubularSegments,

                radialSegments: radialSegments,

                p: p,

                q: q

            };


            tubularSegments = Math.floor( tubularSegments );

            radialSegments = Math.floor( radialSegments );


            // buffers


            const indices = [];

            const vertices = [];

            const normals = [];

            const uvs = [];


            // helper variables


            const vertex = new Vector3();

            const normal = new Vector3();


            const P1 = new Vector3();

            const P2 = new Vector3();


            const B = new Vector3();

            const T = new Vector3();

            const N = new Vector3();


            // generate vertices, normals and uvs


            for ( let i = 0; i <= tubularSegments; ++ i ) {


                // the radian "u" is used to calculate the position on the torus curve of the current tubular segment


                const u = i / tubularSegments * p * Math.PI * 2;


                // now we calculate two points. P1 is our current position on the curve, P2 is a little farther ahead.

                // these points are used to create a special "coordinate space", which is necessary to calculate the correct vertex positions


                calculatePositionOnCurve( u, p, q, radius, P1 );

                calculatePositionOnCurve( u + 0.01, p, q, radius, P2 );


                // calculate orthonormal basis


                T.subVectors( P2, P1 );

                N.addVectors( P2, P1 );

                B.crossVectors( T, N );

                N.crossVectors( B, T );


                // normalize B, N. T can be ignored, we don't use it


                B.normalize();

                N.normalize();


                for ( let j = 0; j <= radialSegments; ++ j ) {


                    // now calculate the vertices. they are nothing more than an extrusion of the torus curve.

                    // because we extrude a shape in the xy-plane, there is no need to calculate a z-value.


                    const v = j / radialSegments * Math.PI * 2;

                    const cx = - tube * Math.cos( v );

                    const cy = tube * Math.sin( v );


                    // now calculate the final vertex position.

                    // first we orient the extrusion with our basis vectors, then we add it to the current position on the curve


                    vertex.x = P1.x + ( cx * N.x + cy * B.x );

                    vertex.y = P1.y + ( cx * N.y + cy * B.y );

                    vertex.z = P1.z + ( cx * N.z + cy * B.z );


                    vertices.push( vertex.x, vertex.y, vertex.z );


                    // normal (P1 is always the center/origin of the extrusion, thus we can use it to calculate the normal)


                    normal.subVectors( vertex, P1 ).normalize();


                    normals.push( normal.x, normal.y, normal.z );


                    // uv


                    uvs.push( i / tubularSegments );

                    uvs.push( j / radialSegments );


                }


            }


            // generate indices


            for ( let j = 1; j <= tubularSegments; j ++ ) {


                for ( let i = 1; i <= radialSegments; i ++ ) {


                    // indices


                    const a = ( radialSegments + 1 ) * ( j - 1 ) + ( i - 1 );

                    const b = ( radialSegments + 1 ) * j + ( i - 1 );

                    const c = ( radialSegments + 1 ) * j + i;

                    const d = ( radialSegments + 1 ) * ( j - 1 ) + i;


                    // faces


                    indices.push( a, b, d );

                    indices.push( b, c, d );


                }


            }


            // build geometry


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


            // this function calculates the current position on the torus curve


            function calculatePositionOnCurve( u, p, q, radius, position ) {


                const cu = Math.cos( u );

                const su = Math.sin( u );

                const quOverP = q / p * u;

                const cs = Math.cos( quOverP );


                position.x = radius * ( 2 + cs ) * 0.5 * cu;

                position.y = radius * ( 2 + cs ) * su * 0.5;

                position.z = radius * Math.sin( quOverP ) * 0.5;


            }


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        static fromJSON( data ) {


            return new TorusKnotGeometry( data.radius, data.tube, data.tubularSegments, data.radialSegments, data.p, data.q );


        }


    }


    class TubeGeometry extends BufferGeometry {


        constructor( path = new QuadraticBezierCurve3( new Vector3( - 1, - 1, 0 ), new Vector3( - 1, 1, 0 ), new Vector3( 1, 1, 0 ) ), tubularSegments = 64, radius = 1, radialSegments = 8, closed = false ) {


            super();


            this.type = 'TubeGeometry';


            this.parameters = {

                path: path,

                tubularSegments: tubularSegments,

                radius: radius,

                radialSegments: radialSegments,

                closed: closed

            };


            const frames = path.computeFrenetFrames( tubularSegments, closed );


            // expose internals


            this.tangents = frames.tangents;

            this.normals = frames.normals;

            this.binormals = frames.binormals;


            // helper variables


            const vertex = new Vector3();

            const normal = new Vector3();

            const uv = new Vector2();

            let P = new Vector3();


            // buffer


            const vertices = [];

            const normals = [];

            const uvs = [];

            const indices = [];


            // create buffer data


            generateBufferData();


            // build geometry


            this.setIndex( indices );

            this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

            this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


            // functions


            function generateBufferData() {


                for ( let i = 0; i < tubularSegments; i ++ ) {


                    generateSegment( i );


                }


                // if the geometry is not closed, generate the last row of vertices and normals

                // at the regular position on the given path

                //

                // if the geometry is closed, duplicate the first row of vertices and normals (uvs will differ)


                generateSegment( ( closed === false ) ? tubularSegments : 0 );


                // uvs are generated in a separate function.

                // this makes it easy compute correct values for closed geometries


                generateUVs();


                // finally create faces


                generateIndices();


            }


            function generateSegment( i ) {


                // we use getPointAt to sample evenly distributed points from the given path


                P = path.getPointAt( i / tubularSegments, P );


                // retrieve corresponding normal and binormal


                const N = frames.normals[ i ];

                const B = frames.binormals[ i ];


                // generate normals and vertices for the current segment


                for ( let j = 0; j <= radialSegments; j ++ ) {


                    const v = j / radialSegments * Math.PI * 2;


                    const sin = Math.sin( v );

                    const cos = - Math.cos( v );


                    // normal


                    normal.x = ( cos * N.x + sin * B.x );

                    normal.y = ( cos * N.y + sin * B.y );

                    normal.z = ( cos * N.z + sin * B.z );

                    normal.normalize();


                    normals.push( normal.x, normal.y, normal.z );


                    // vertex


                    vertex.x = P.x + radius * normal.x;

                    vertex.y = P.y + radius * normal.y;

                    vertex.z = P.z + radius * normal.z;


                    vertices.push( vertex.x, vertex.y, vertex.z );


                }


            }


            function generateIndices() {


                for ( let j = 1; j <= tubularSegments; j ++ ) {


                    for ( let i = 1; i <= radialSegments; i ++ ) {


                        const a = ( radialSegments + 1 ) * ( j - 1 ) + ( i - 1 );

                        const b = ( radialSegments + 1 ) * j + ( i - 1 );

                        const c = ( radialSegments + 1 ) * j + i;

                        const d = ( radialSegments + 1 ) * ( j - 1 ) + i;


                        // faces


                        indices.push( a, b, d );

                        indices.push( b, c, d );


                    }


                }


            }


            function generateUVs() {


                for ( let i = 0; i <= tubularSegments; i ++ ) {


                    for ( let j = 0; j <= radialSegments; j ++ ) {


                        uv.x = i / tubularSegments;

                        uv.y = j / radialSegments;


                        uvs.push( uv.x, uv.y );


                    }


                }


            }


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.path = this.parameters.path.toJSON();


            return data;


        }


        static fromJSON( data ) {


            // This only works for built-in curves (e.g. CatmullRomCurve3).

            // User defined curves or instances of CurvePath will not be deserialized.

            return new TubeGeometry(

                new Curves[ data.path.type ]().fromJSON( data.path ),

                data.tubularSegments,

                data.radius,

                data.radialSegments,

                data.closed

            );


        }


    }


    class WireframeGeometry extends BufferGeometry {


        constructor( geometry = null ) {


            super();


            this.type = 'WireframeGeometry';


            this.parameters = {

                geometry: geometry

            };


            if ( geometry !== null ) {


                // buffer


                const vertices = [];

                const edges = new Set();


                // helper variables


                const start = new Vector3();

                const end = new Vector3();


                if ( geometry.index !== null ) {


                    // indexed BufferGeometry


                    const position = geometry.attributes.position;

                    const indices = geometry.index;

                    let groups = geometry.groups;


                    if ( groups.length === 0 ) {


                        groups = [ { start: 0, count: indices.count, materialIndex: 0 } ];


                    }


                    // create a data structure that contains all edges without duplicates


                    for ( let o = 0, ol = groups.length; o < ol; ++ o ) {


                        const group = groups[ o ];


                        const groupStart = group.start;

                        const groupCount = group.count;


                        for ( let i = groupStart, l = ( groupStart + groupCount ); i < l; i += 3 ) {


                            for ( let j = 0; j < 3; j ++ ) {


                                const index1 = indices.getX( i + j );

                                const index2 = indices.getX( i + ( j + 1 ) % 3 );


                                start.fromBufferAttribute( position, index1 );

                                end.fromBufferAttribute( position, index2 );


                                if ( isUniqueEdge( start, end, edges ) === true ) {


                                    vertices.push( start.x, start.y, start.z );

                                    vertices.push( end.x, end.y, end.z );


                                }


                            }


                        }


                    }


                } else {


                    // non-indexed BufferGeometry


                    const position = geometry.attributes.position;


                    for ( let i = 0, l = ( position.count / 3 ); i < l; i ++ ) {


                        for ( let j = 0; j < 3; j ++ ) {


                            // three edges per triangle, an edge is represented as (index1, index2)

                            // e.g. the first triangle has the following edges: (0,1),(1,2),(2,0)


                            const index1 = 3 * i + j;

                            const index2 = 3 * i + ( ( j + 1 ) % 3 );


                            start.fromBufferAttribute( position, index1 );

                            end.fromBufferAttribute( position, index2 );


                            if ( isUniqueEdge( start, end, edges ) === true ) {


                                vertices.push( start.x, start.y, start.z );

                                vertices.push( end.x, end.y, end.z );


                            }


                        }


                    }


                }


                // build geometry


                this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );


            }


        }


        copy( source ) {


            super.copy( source );


            this.parameters = Object.assign( {}, source.parameters );


            return this;


        }


    }


    function isUniqueEdge( start, end, edges ) {


        const hash1 = `${start.x},${start.y},${start.z}-${end.x},${end.y},${end.z}`;

        const hash2 = `${end.x},${end.y},${end.z}-${start.x},${start.y},${start.z}`; // coincident edge


        if ( edges.has( hash1 ) === true || edges.has( hash2 ) === true ) {


            return false;


        } else {


            edges.add( hash1 );

            edges.add( hash2 );

            return true;


        }


    }


    var Geometries = /*#__PURE__*/Object.freeze({

        __proto__: null,

        BoxGeometry: BoxGeometry,

        CapsuleGeometry: CapsuleGeometry,

        CircleGeometry: CircleGeometry,

        ConeGeometry: ConeGeometry,

        CylinderGeometry: CylinderGeometry,

        DodecahedronGeometry: DodecahedronGeometry,

        EdgesGeometry: EdgesGeometry,

        ExtrudeGeometry: ExtrudeGeometry,

        IcosahedronGeometry: IcosahedronGeometry,

        LatheGeometry: LatheGeometry,

        OctahedronGeometry: OctahedronGeometry,

        PlaneGeometry: PlaneGeometry,

        PolyhedronGeometry: PolyhedronGeometry,

        RingGeometry: RingGeometry,

        ShapeGeometry: ShapeGeometry,

        SphereGeometry: SphereGeometry,

        TetrahedronGeometry: TetrahedronGeometry,

        TorusGeometry: TorusGeometry,

        TorusKnotGeometry: TorusKnotGeometry,

        TubeGeometry: TubeGeometry,

        WireframeGeometry: WireframeGeometry

    });


    class ShadowMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isShadowMaterial = true;


            this.type = 'ShadowMaterial';


            this.color = new Color( 0x000000 );

            this.transparent = true;


            this.fog = true;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.color.copy( source.color );


            this.fog = source.fog;


            return this;


        }


    }


    class RawShaderMaterial extends ShaderMaterial {


        constructor( parameters ) {


            super( parameters );


            this.isRawShaderMaterial = true;


            this.type = 'RawShaderMaterial';


        }


    }


    class MeshStandardMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isMeshStandardMaterial = true;


            this.defines = { 'STANDARD': '' };


            this.type = 'MeshStandardMaterial';


            this.color = new Color( 0xffffff ); // diffuse

            this.roughness = 1.0;

            this.metalness = 0.0;


            this.map = null;


            this.lightMap = null;

            this.lightMapIntensity = 1.0;


            this.aoMap = null;

            this.aoMapIntensity = 1.0;


            this.emissive = new Color( 0x000000 );

            this.emissiveIntensity = 1.0;

            this.emissiveMap = null;


            this.bumpMap = null;

            this.bumpScale = 1;


            this.normalMap = null;

            this.normalMapType = TangentSpaceNormalMap;

            this.normalScale = new Vector2( 1, 1 );


            this.displacementMap = null;

            this.displacementScale = 1;

            this.displacementBias = 0;


            this.roughnessMap = null;


            this.metalnessMap = null;


            this.alphaMap = null;


            this.envMap = null;

            this.envMapIntensity = 1.0;


            this.wireframe = false;

            this.wireframeLinewidth = 1;

            this.wireframeLinecap = 'round';

            this.wireframeLinejoin = 'round';


            this.flatShading = false;


            this.fog = true;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.defines = { 'STANDARD': '' };


            this.color.copy( source.color );

            this.roughness = source.roughness;

            this.metalness = source.metalness;


            this.map = source.map;


            this.lightMap = source.lightMap;

            this.lightMapIntensity = source.lightMapIntensity;


            this.aoMap = source.aoMap;

            this.aoMapIntensity = source.aoMapIntensity;


            this.emissive.copy( source.emissive );

            this.emissiveMap = source.emissiveMap;

            this.emissiveIntensity = source.emissiveIntensity;


            this.bumpMap = source.bumpMap;

            this.bumpScale = source.bumpScale;


            this.normalMap = source.normalMap;

            this.normalMapType = source.normalMapType;

            this.normalScale.copy( source.normalScale );


            this.displacementMap = source.displacementMap;

            this.displacementScale = source.displacementScale;

            this.displacementBias = source.displacementBias;


            this.roughnessMap = source.roughnessMap;


            this.metalnessMap = source.metalnessMap;


            this.alphaMap = source.alphaMap;


            this.envMap = source.envMap;

            this.envMapIntensity = source.envMapIntensity;


            this.wireframe = source.wireframe;

            this.wireframeLinewidth = source.wireframeLinewidth;

            this.wireframeLinecap = source.wireframeLinecap;

            this.wireframeLinejoin = source.wireframeLinejoin;


            this.flatShading = source.flatShading;


            this.fog = source.fog;


            return this;


        }


    }


    class MeshPhysicalMaterial extends MeshStandardMaterial {


        constructor( parameters ) {


            super();


            this.isMeshPhysicalMaterial = true;


            this.defines = {


                'STANDARD': '',

                'PHYSICAL': ''


            };


            this.type = 'MeshPhysicalMaterial';


            this.anisotropyRotation = 0;

            this.anisotropyMap = null;


            this.clearcoatMap = null;

            this.clearcoatRoughness = 0.0;

            this.clearcoatRoughnessMap = null;

            this.clearcoatNormalScale = new Vector2( 1, 1 );

            this.clearcoatNormalMap = null;


            this.ior = 1.5;


            Object.defineProperty( this, 'reflectivity', {

                get: function () {


                    return ( clamp( 2.5 * ( this.ior - 1 ) / ( this.ior + 1 ), 0, 1 ) );


                },

                set: function ( reflectivity ) {


                    this.ior = ( 1 + 0.4 * reflectivity ) / ( 1 - 0.4 * reflectivity );


                }

            } );


            this.iridescenceMap = null;

            this.iridescenceIOR = 1.3;

            this.iridescenceThicknessRange = [ 100, 400 ];

            this.iridescenceThicknessMap = null;


            this.sheenColor = new Color( 0x000000 );

            this.sheenColorMap = null;

            this.sheenRoughness = 1.0;

            this.sheenRoughnessMap = null;


            this.transmissionMap = null;


            this.thickness = 0;

            this.thicknessMap = null;

            this.attenuationDistance = Infinity;

            this.attenuationColor = new Color( 1, 1, 1 );


            this.specularIntensity = 1.0;

            this.specularIntensityMap = null;

            this.specularColor = new Color( 1, 1, 1 );

            this.specularColorMap = null;


            this._anisotropy = 0;

            this._clearcoat = 0;

            this._iridescence = 0;

            this._sheen = 0.0;

            this._transmission = 0;


            this.setValues( parameters );


        }


        get anisotropy() {


            return this._anisotropy;


        }


        set anisotropy( value ) {


            if ( this._anisotropy > 0 !== value > 0 ) {


                this.version ++;


            }


            this._anisotropy = value;


        }


        get clearcoat() {


            return this._clearcoat;


        }


        set clearcoat( value ) {


            if ( this._clearcoat > 0 !== value > 0 ) {


                this.version ++;


            }


            this._clearcoat = value;


        }


        get iridescence() {


            return this._iridescence;


        }


        set iridescence( value ) {


            if ( this._iridescence > 0 !== value > 0 ) {


                this.version ++;


            }


            this._iridescence = value;


        }


        get sheen() {


            return this._sheen;


        }


        set sheen( value ) {


            if ( this._sheen > 0 !== value > 0 ) {


                this.version ++;


            }


            this._sheen = value;


        }


        get transmission() {


            return this._transmission;


        }


        set transmission( value ) {


            if ( this._transmission > 0 !== value > 0 ) {


                this.version ++;


            }


            this._transmission = value;


        }


        copy( source ) {


            super.copy( source );


            this.defines = {


                'STANDARD': '',

                'PHYSICAL': ''


            };


            this.anisotropy = source.anisotropy;

            this.anisotropyRotation = source.anisotropyRotation;

            this.anisotropyMap = source.anisotropyMap;


            this.clearcoat = source.clearcoat;

            this.clearcoatMap = source.clearcoatMap;

            this.clearcoatRoughness = source.clearcoatRoughness;

            this.clearcoatRoughnessMap = source.clearcoatRoughnessMap;

            this.clearcoatNormalMap = source.clearcoatNormalMap;

            this.clearcoatNormalScale.copy( source.clearcoatNormalScale );


            this.ior = source.ior;


            this.iridescence = source.iridescence;

            this.iridescenceMap = source.iridescenceMap;

            this.iridescenceIOR = source.iridescenceIOR;

            this.iridescenceThicknessRange = [ ...source.iridescenceThicknessRange ];

            this.iridescenceThicknessMap = source.iridescenceThicknessMap;


            this.sheen = source.sheen;

            this.sheenColor.copy( source.sheenColor );

            this.sheenColorMap = source.sheenColorMap;

            this.sheenRoughness = source.sheenRoughness;

            this.sheenRoughnessMap = source.sheenRoughnessMap;


            this.transmission = source.transmission;

            this.transmissionMap = source.transmissionMap;


            this.thickness = source.thickness;

            this.thicknessMap = source.thicknessMap;

            this.attenuationDistance = source.attenuationDistance;

            this.attenuationColor.copy( source.attenuationColor );


            this.specularIntensity = source.specularIntensity;

            this.specularIntensityMap = source.specularIntensityMap;

            this.specularColor.copy( source.specularColor );

            this.specularColorMap = source.specularColorMap;


            return this;


        }


    }


    class MeshPhongMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isMeshPhongMaterial = true;


            this.type = 'MeshPhongMaterial';


            this.color = new Color( 0xffffff ); // diffuse

            this.specular = new Color( 0x111111 );

            this.shininess = 30;


            this.map = null;


            this.lightMap = null;

            this.lightMapIntensity = 1.0;


            this.aoMap = null;

            this.aoMapIntensity = 1.0;


            this.emissive = new Color( 0x000000 );

            this.emissiveIntensity = 1.0;

            this.emissiveMap = null;


            this.bumpMap = null;

            this.bumpScale = 1;


            this.normalMap = null;

            this.normalMapType = TangentSpaceNormalMap;

            this.normalScale = new Vector2( 1, 1 );


            this.displacementMap = null;

            this.displacementScale = 1;

            this.displacementBias = 0;


            this.specularMap = null;


            this.alphaMap = null;


            this.envMap = null;

            this.combine = MultiplyOperation;

            this.reflectivity = 1;

            this.refractionRatio = 0.98;


            this.wireframe = false;

            this.wireframeLinewidth = 1;

            this.wireframeLinecap = 'round';

            this.wireframeLinejoin = 'round';


            this.flatShading = false;


            this.fog = true;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.color.copy( source.color );

            this.specular.copy( source.specular );

            this.shininess = source.shininess;


            this.map = source.map;


            this.lightMap = source.lightMap;

            this.lightMapIntensity = source.lightMapIntensity;


            this.aoMap = source.aoMap;

            this.aoMapIntensity = source.aoMapIntensity;


            this.emissive.copy( source.emissive );

            this.emissiveMap = source.emissiveMap;

            this.emissiveIntensity = source.emissiveIntensity;


            this.bumpMap = source.bumpMap;

            this.bumpScale = source.bumpScale;


            this.normalMap = source.normalMap;

            this.normalMapType = source.normalMapType;

            this.normalScale.copy( source.normalScale );


            this.displacementMap = source.displacementMap;

            this.displacementScale = source.displacementScale;

            this.displacementBias = source.displacementBias;


            this.specularMap = source.specularMap;


            this.alphaMap = source.alphaMap;


            this.envMap = source.envMap;

            this.combine = source.combine;

            this.reflectivity = source.reflectivity;

            this.refractionRatio = source.refractionRatio;


            this.wireframe = source.wireframe;

            this.wireframeLinewidth = source.wireframeLinewidth;

            this.wireframeLinecap = source.wireframeLinecap;

            this.wireframeLinejoin = source.wireframeLinejoin;


            this.flatShading = source.flatShading;


            this.fog = source.fog;


            return this;


        }


    }


    class MeshToonMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isMeshToonMaterial = true;


            this.defines = { 'TOON': '' };


            this.type = 'MeshToonMaterial';


            this.color = new Color( 0xffffff );


            this.map = null;

            this.gradientMap = null;


            this.lightMap = null;

            this.lightMapIntensity = 1.0;


            this.aoMap = null;

            this.aoMapIntensity = 1.0;


            this.emissive = new Color( 0x000000 );

            this.emissiveIntensity = 1.0;

            this.emissiveMap = null;


            this.bumpMap = null;

            this.bumpScale = 1;


            this.normalMap = null;

            this.normalMapType = TangentSpaceNormalMap;

            this.normalScale = new Vector2( 1, 1 );


            this.displacementMap = null;

            this.displacementScale = 1;

            this.displacementBias = 0;


            this.alphaMap = null;


            this.wireframe = false;

            this.wireframeLinewidth = 1;

            this.wireframeLinecap = 'round';

            this.wireframeLinejoin = 'round';


            this.fog = true;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.color.copy( source.color );


            this.map = source.map;

            this.gradientMap = source.gradientMap;


            this.lightMap = source.lightMap;

            this.lightMapIntensity = source.lightMapIntensity;


            this.aoMap = source.aoMap;

            this.aoMapIntensity = source.aoMapIntensity;


            this.emissive.copy( source.emissive );

            this.emissiveMap = source.emissiveMap;

            this.emissiveIntensity = source.emissiveIntensity;


            this.bumpMap = source.bumpMap;

            this.bumpScale = source.bumpScale;


            this.normalMap = source.normalMap;

            this.normalMapType = source.normalMapType;

            this.normalScale.copy( source.normalScale );


            this.displacementMap = source.displacementMap;

            this.displacementScale = source.displacementScale;

            this.displacementBias = source.displacementBias;


            this.alphaMap = source.alphaMap;


            this.wireframe = source.wireframe;

            this.wireframeLinewidth = source.wireframeLinewidth;

            this.wireframeLinecap = source.wireframeLinecap;

            this.wireframeLinejoin = source.wireframeLinejoin;


            this.fog = source.fog;


            return this;


        }


    }


    class MeshNormalMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isMeshNormalMaterial = true;


            this.type = 'MeshNormalMaterial';


            this.bumpMap = null;

            this.bumpScale = 1;


            this.normalMap = null;

            this.normalMapType = TangentSpaceNormalMap;

            this.normalScale = new Vector2( 1, 1 );


            this.displacementMap = null;

            this.displacementScale = 1;

            this.displacementBias = 0;


            this.wireframe = false;

            this.wireframeLinewidth = 1;


            this.flatShading = false;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.bumpMap = source.bumpMap;

            this.bumpScale = source.bumpScale;


            this.normalMap = source.normalMap;

            this.normalMapType = source.normalMapType;

            this.normalScale.copy( source.normalScale );


            this.displacementMap = source.displacementMap;

            this.displacementScale = source.displacementScale;

            this.displacementBias = source.displacementBias;


            this.wireframe = source.wireframe;

            this.wireframeLinewidth = source.wireframeLinewidth;


            this.flatShading = source.flatShading;


            return this;


        }


    }


    class MeshLambertMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isMeshLambertMaterial = true;


            this.type = 'MeshLambertMaterial';


            this.color = new Color( 0xffffff ); // diffuse


            this.map = null;


            this.lightMap = null;

            this.lightMapIntensity = 1.0;


            this.aoMap = null;

            this.aoMapIntensity = 1.0;


            this.emissive = new Color( 0x000000 );

            this.emissiveIntensity = 1.0;

            this.emissiveMap = null;


            this.bumpMap = null;

            this.bumpScale = 1;


            this.normalMap = null;

            this.normalMapType = TangentSpaceNormalMap;

            this.normalScale = new Vector2( 1, 1 );


            this.displacementMap = null;

            this.displacementScale = 1;

            this.displacementBias = 0;


            this.specularMap = null;


            this.alphaMap = null;


            this.envMap = null;

            this.combine = MultiplyOperation;

            this.reflectivity = 1;

            this.refractionRatio = 0.98;


            this.wireframe = false;

            this.wireframeLinewidth = 1;

            this.wireframeLinecap = 'round';

            this.wireframeLinejoin = 'round';


            this.flatShading = false;


            this.fog = true;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.color.copy( source.color );


            this.map = source.map;


            this.lightMap = source.lightMap;

            this.lightMapIntensity = source.lightMapIntensity;


            this.aoMap = source.aoMap;

            this.aoMapIntensity = source.aoMapIntensity;


            this.emissive.copy( source.emissive );

            this.emissiveMap = source.emissiveMap;

            this.emissiveIntensity = source.emissiveIntensity;


            this.bumpMap = source.bumpMap;

            this.bumpScale = source.bumpScale;


            this.normalMap = source.normalMap;

            this.normalMapType = source.normalMapType;

            this.normalScale.copy( source.normalScale );


            this.displacementMap = source.displacementMap;

            this.displacementScale = source.displacementScale;

            this.displacementBias = source.displacementBias;


            this.specularMap = source.specularMap;


            this.alphaMap = source.alphaMap;


            this.envMap = source.envMap;

            this.combine = source.combine;

            this.reflectivity = source.reflectivity;

            this.refractionRatio = source.refractionRatio;


            this.wireframe = source.wireframe;

            this.wireframeLinewidth = source.wireframeLinewidth;

            this.wireframeLinecap = source.wireframeLinecap;

            this.wireframeLinejoin = source.wireframeLinejoin;


            this.flatShading = source.flatShading;


            this.fog = source.fog;


            return this;


        }


    }


    class MeshMatcapMaterial extends Material {


        constructor( parameters ) {


            super();


            this.isMeshMatcapMaterial = true;


            this.defines = { 'MATCAP': '' };


            this.type = 'MeshMatcapMaterial';


            this.color = new Color( 0xffffff ); // diffuse


            this.matcap = null;


            this.map = null;


            this.bumpMap = null;

            this.bumpScale = 1;


            this.normalMap = null;

            this.normalMapType = TangentSpaceNormalMap;

            this.normalScale = new Vector2( 1, 1 );


            this.displacementMap = null;

            this.displacementScale = 1;

            this.displacementBias = 0;


            this.alphaMap = null;


            this.flatShading = false;


            this.fog = true;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.defines = { 'MATCAP': '' };


            this.color.copy( source.color );


            this.matcap = source.matcap;


            this.map = source.map;


            this.bumpMap = source.bumpMap;

            this.bumpScale = source.bumpScale;


            this.normalMap = source.normalMap;

            this.normalMapType = source.normalMapType;

            this.normalScale.copy( source.normalScale );


            this.displacementMap = source.displacementMap;

            this.displacementScale = source.displacementScale;

            this.displacementBias = source.displacementBias;


            this.alphaMap = source.alphaMap;


            this.flatShading = source.flatShading;


            this.fog = source.fog;


            return this;


        }


    }


    class LineDashedMaterial extends LineBasicMaterial {


        constructor( parameters ) {


            super();


            this.isLineDashedMaterial = true;


            this.type = 'LineDashedMaterial';


            this.scale = 1;

            this.dashSize = 3;

            this.gapSize = 1;


            this.setValues( parameters );


        }


        copy( source ) {


            super.copy( source );


            this.scale = source.scale;

            this.dashSize = source.dashSize;

            this.gapSize = source.gapSize;


            return this;


        }


    }


    // converts an array to a specific type

    function convertArray( array, type, forceClone ) {


        if ( ! array || // let 'undefined' and 'null' pass

            ! forceClone && array.constructor === type ) return array;


        if ( typeof type.BYTES_PER_ELEMENT === 'number' ) {


            return new type( array ); // create typed array


        }


        return Array.prototype.slice.call( array ); // create Array


    }


    function isTypedArray( object ) {


        return ArrayBuffer.isView( object ) &&

            ! ( object instanceof DataView );


    }


    // returns an array by which times and values can be sorted

    function getKeyframeOrder( times ) {


        function compareTime( i, j ) {


            return times[ i ] - times[ j ];


        }


        const n = times.length;

        const result = new Array( n );

        for ( let i = 0; i !== n; ++ i ) result[ i ] = i;


        result.sort( compareTime );


        return result;


    }


    // uses the array previously returned by 'getKeyframeOrder' to sort data

    function sortedArray( values, stride, order ) {


        const nValues = values.length;

        const result = new values.constructor( nValues );


        for ( let i = 0, dstOffset = 0; dstOffset !== nValues; ++ i ) {


            const srcOffset = order[ i ] * stride;


            for ( let j = 0; j !== stride; ++ j ) {


                result[ dstOffset ++ ] = values[ srcOffset + j ];


            }


        }


        return result;


    }


    // function for parsing AOS keyframe formats

    function flattenJSON( jsonKeys, times, values, valuePropertyName ) {


        let i = 1, key = jsonKeys[ 0 ];


        while ( key !== undefined && key[ valuePropertyName ] === undefined ) {


            key = jsonKeys[ i ++ ];


        }


        if ( key === undefined ) return; // no data


        let value = key[ valuePropertyName ];

        if ( value === undefined ) return; // no data


        if ( Array.isArray( value ) ) {


            do {


                value = key[ valuePropertyName ];


                if ( value !== undefined ) {


                    times.push( key.time );

                    values.push.apply( values, value ); // push all elements


                }


                key = jsonKeys[ i ++ ];


            } while ( key !== undefined );


        } else if ( value.toArray !== undefined ) {


            // ...assume THREE.Math-ish


            do {


                value = key[ valuePropertyName ];


                if ( value !== undefined ) {


                    times.push( key.time );

                    value.toArray( values, values.length );


                }


                key = jsonKeys[ i ++ ];


            } while ( key !== undefined );


        } else {


            // otherwise push as-is


            do {


                value = key[ valuePropertyName ];


                if ( value !== undefined ) {


                    times.push( key.time );

                    values.push( value );


                }


                key = jsonKeys[ i ++ ];


            } while ( key !== undefined );


        }


    }


    function subclip( sourceClip, name, startFrame, endFrame, fps = 30 ) {


        const clip = sourceClip.clone();


        clip.name = name;


        const tracks = [];


        for ( let i = 0; i < clip.tracks.length; ++ i ) {


            const track = clip.tracks[ i ];

            const valueSize = track.getValueSize();


            const times = [];

            const values = [];


            for ( let j = 0; j < track.times.length; ++ j ) {


                const frame = track.times[ j ] * fps;


                if ( frame < startFrame || frame >= endFrame ) continue;


                times.push( track.times[ j ] );


                for ( let k = 0; k < valueSize; ++ k ) {


                    values.push( track.values[ j * valueSize + k ] );


                }


            }


            if ( times.length === 0 ) continue;


            track.times = convertArray( times, track.times.constructor );

            track.values = convertArray( values, track.values.constructor );


            tracks.push( track );


        }


        clip.tracks = tracks;


        // find minimum .times value across all tracks in the trimmed clip


        let minStartTime = Infinity;


        for ( let i = 0; i < clip.tracks.length; ++ i ) {


            if ( minStartTime > clip.tracks[ i ].times[ 0 ] ) {


                minStartTime = clip.tracks[ i ].times[ 0 ];


            }


        }


        // shift all tracks such that clip begins at t=0


        for ( let i = 0; i < clip.tracks.length; ++ i ) {


            clip.tracks[ i ].shift( - 1 * minStartTime );


        }


        clip.resetDuration();


        return clip;


    }


    function makeClipAdditive( targetClip, referenceFrame = 0, referenceClip = targetClip, fps = 30 ) {


        if ( fps <= 0 ) fps = 30;


        const numTracks = referenceClip.tracks.length;

        const referenceTime = referenceFrame / fps;


        // Make each track's values relative to the values at the reference frame

        for ( let i = 0; i < numTracks; ++ i ) {


            const referenceTrack = referenceClip.tracks[ i ];

            const referenceTrackType = referenceTrack.ValueTypeName;


            // Skip this track if it's non-numeric

            if ( referenceTrackType === 'bool' || referenceTrackType === 'string' ) continue;


            // Find the track in the target clip whose name and type matches the reference track

            const targetTrack = targetClip.tracks.find( function ( track ) {


                return track.name === referenceTrack.name

                    && track.ValueTypeName === referenceTrackType;


            } );


            if ( targetTrack === undefined ) continue;


            let referenceOffset = 0;

            const referenceValueSize = referenceTrack.getValueSize();


            if ( referenceTrack.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline ) {


                referenceOffset = referenceValueSize / 3;


            }


            let targetOffset = 0;

            const targetValueSize = targetTrack.getValueSize();


            if ( targetTrack.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline ) {


                targetOffset = targetValueSize / 3;


            }


            const lastIndex = referenceTrack.times.length - 1;

            let referenceValue;


            // Find the value to subtract out of the track

            if ( referenceTime <= referenceTrack.times[ 0 ] ) {


                // Reference frame is earlier than the first keyframe, so just use the first keyframe

                const startIndex = referenceOffset;

                const endIndex = referenceValueSize - referenceOffset;

                referenceValue = referenceTrack.values.slice( startIndex, endIndex );


            } else if ( referenceTime >= referenceTrack.times[ lastIndex ] ) {


                // Reference frame is after the last keyframe, so just use the last keyframe

                const startIndex = lastIndex * referenceValueSize + referenceOffset;

                const endIndex = startIndex + referenceValueSize - referenceOffset;

                referenceValue = referenceTrack.values.slice( startIndex, endIndex );


            } else {


                // Interpolate to the reference value

                const interpolant = referenceTrack.createInterpolant();

                const startIndex = referenceOffset;

                const endIndex = referenceValueSize - referenceOffset;

                interpolant.evaluate( referenceTime );

                referenceValue = interpolant.resultBuffer.slice( startIndex, endIndex );


            }


            // Conjugate the quaternion

            if ( referenceTrackType === 'quaternion' ) {


                const referenceQuat = new Quaternion().fromArray( referenceValue ).normalize().conjugate();

                referenceQuat.toArray( referenceValue );


            }


            // Subtract the reference value from all of the track values


            const numTimes = targetTrack.times.length;

            for ( let j = 0; j < numTimes; ++ j ) {


                const valueStart = j * targetValueSize + targetOffset;


                if ( referenceTrackType === 'quaternion' ) {


                    // Multiply the conjugate for quaternion track types

                    Quaternion.multiplyQuaternionsFlat(

                        targetTrack.values,

                        valueStart,

                        referenceValue,

                        0,

                        targetTrack.values,

                        valueStart

                    );


                } else {


                    const valueEnd = targetValueSize - targetOffset * 2;


                    // Subtract each value for all other numeric track types

                    for ( let k = 0; k < valueEnd; ++ k ) {


                        targetTrack.values[ valueStart + k ] -= referenceValue[ k ];


                    }


                }


            }


        }


        targetClip.blendMode = AdditiveAnimationBlendMode;


        return targetClip;


    }


    const AnimationUtils = {

        convertArray: convertArray,

        isTypedArray: isTypedArray,

        getKeyframeOrder: getKeyframeOrder,

        sortedArray: sortedArray,

        flattenJSON: flattenJSON,

        subclip: subclip,

        makeClipAdditive: makeClipAdditive

    };


    class Interpolant {


        constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {


            this.parameterPositions = parameterPositions;

            this._cachedIndex = 0;


            this.resultBuffer = resultBuffer !== undefined ?

                resultBuffer : new sampleValues.constructor( sampleSize );

            this.sampleValues = sampleValues;

            this.valueSize = sampleSize;


            this.settings = null;

            this.DefaultSettings_ = {};


        }


        evaluate( t ) {


            const pp = this.parameterPositions;

            let i1 = this._cachedIndex,

                t1 = pp[ i1 ],

                t0 = pp[ i1 - 1 ];


            validate_interval: {


                seek: {


                    let right;


                    linear_scan: {


                        //- See http://jsperf.com/comparison-to-undefined/3

                        //- slower code:

                        //-

                        //-                 if ( t >= t1 || t1 === undefined ) {

                        forward_scan: if ( ! ( t < t1 ) ) {


                            for ( let giveUpAt = i1 + 2; ; ) {


                                if ( t1 === undefined ) {


                                    if ( t < t0 ) break forward_scan;


                                    // after end


                                    i1 = pp.length;

                                    this._cachedIndex = i1;

                                    return this.copySampleValue_( i1 - 1 );


                                }


                                if ( i1 === giveUpAt ) break; // this loop


                                t0 = t1;

                                t1 = pp[ ++ i1 ];


                                if ( t < t1 ) {


                                    // we have arrived at the sought interval

                                    break seek;


                                }


                            }


                            // prepare binary search on the right side of the index

                            right = pp.length;

                            break linear_scan;


                        }


                        //- slower code:

                        //-                 if ( t < t0 || t0 === undefined ) {

                        if ( ! ( t >= t0 ) ) {


                            // looping?


                            const t1global = pp[ 1 ];


                            if ( t < t1global ) {


                                i1 = 2; // + 1, using the scan for the details

                                t0 = t1global;


                            }


                            // linear reverse scan


                            for ( let giveUpAt = i1 - 2; ; ) {


                                if ( t0 === undefined ) {


                                    // before start


                                    this._cachedIndex = 0;

                                    return this.copySampleValue_( 0 );


                                }


                                if ( i1 === giveUpAt ) break; // this loop


                                t1 = t0;

                                t0 = pp[ -- i1 - 1 ];


                                if ( t >= t0 ) {


                                    // we have arrived at the sought interval

                                    break seek;


                                }


                            }


                            // prepare binary search on the left side of the index

                            right = i1;

                            i1 = 0;

                            break linear_scan;


                        }


                        // the interval is valid


                        break validate_interval;


                    } // linear scan


                    // binary search


                    while ( i1 < right ) {


                        const mid = ( i1 + right ) >>> 1;


                        if ( t < pp[ mid ] ) {


                            right = mid;


                        } else {


                            i1 = mid + 1;


                        }


                    }


                    t1 = pp[ i1 ];

                    t0 = pp[ i1 - 1 ];


                    // check boundary cases, again


                    if ( t0 === undefined ) {


                        this._cachedIndex = 0;

                        return this.copySampleValue_( 0 );


                    }


                    if ( t1 === undefined ) {


                        i1 = pp.length;

                        this._cachedIndex = i1;

                        return this.copySampleValue_( i1 - 1 );


                    }


                } // seek


                this._cachedIndex = i1;


                this.intervalChanged_( i1, t0, t1 );


            } // validate_interval


            return this.interpolate_( i1, t0, t, t1 );


        }


        getSettings_() {


            return this.settings || this.DefaultSettings_;


        }


        copySampleValue_( index ) {


            // copies a sample value to the result buffer


            const result = this.resultBuffer,

                values = this.sampleValues,

                stride = this.valueSize,

                offset = index * stride;


            for ( let i = 0; i !== stride; ++ i ) {


                result[ i ] = values[ offset + i ];


            }


            return result;


        }


        // Template methods for derived classes:


        interpolate_( /* i1, t0, t, t1 */ ) {


            throw new Error( 'call to abstract method' );

            // implementations shall return this.resultBuffer


        }


        intervalChanged_( /* i1, t0, t1 */ ) {


            // empty


        }


    }


    class CubicInterpolant extends Interpolant {


        constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {


            super( parameterPositions, sampleValues, sampleSize, resultBuffer );


            this._weightPrev = - 0;

            this._offsetPrev = - 0;

            this._weightNext = - 0;

            this._offsetNext = - 0;


            this.DefaultSettings_ = {


                endingStart: ZeroCurvatureEnding,

                endingEnd: ZeroCurvatureEnding


            };


        }


        intervalChanged_( i1, t0, t1 ) {


            const pp = this.parameterPositions;

            let iPrev = i1 - 2,

                iNext = i1 + 1,


                tPrev = pp[ iPrev ],

                tNext = pp[ iNext ];


            if ( tPrev === undefined ) {


                switch ( this.getSettings_().endingStart ) {


                    case ZeroSlopeEnding:


                        // f'(t0) = 0

                        iPrev = i1;

                        tPrev = 2 * t0 - t1;


                        break;


                    case WrapAroundEnding:


                        // use the other end of the curve

                        iPrev = pp.length - 2;

                        tPrev = t0 + pp[ iPrev ] - pp[ iPrev + 1 ];


                        break;


                    default: // ZeroCurvatureEnding


                        // f''(t0) = 0 a.k.a. Natural Spline

                        iPrev = i1;

                        tPrev = t1;


                }


            }


            if ( tNext === undefined ) {


                switch ( this.getSettings_().endingEnd ) {


                    case ZeroSlopeEnding:


                        // f'(tN) = 0

                        iNext = i1;

                        tNext = 2 * t1 - t0;


                        break;


                    case WrapAroundEnding:


                        // use the other end of the curve

                        iNext = 1;

                        tNext = t1 + pp[ 1 ] - pp[ 0 ];


                        break;


                    default: // ZeroCurvatureEnding


                        // f''(tN) = 0, a.k.a. Natural Spline

                        iNext = i1 - 1;

                        tNext = t0;


                }


            }


            const halfDt = ( t1 - t0 ) * 0.5,

                stride = this.valueSize;


            this._weightPrev = halfDt / ( t0 - tPrev );

            this._weightNext = halfDt / ( tNext - t1 );

            this._offsetPrev = iPrev * stride;

            this._offsetNext = iNext * stride;


        }


        interpolate_( i1, t0, t, t1 ) {


            const result = this.resultBuffer,

                values = this.sampleValues,

                stride = this.valueSize,


                o1 = i1 * stride,       o0 = o1 - stride,

                oP = this._offsetPrev,  oN = this._offsetNext,

                wP = this._weightPrev,  wN = this._weightNext,


                p = ( t - t0 ) / ( t1 - t0 ),

                pp = p * p,

                ppp = pp * p;


            // evaluate polynomials


            const sP = - wP * ppp + 2 * wP * pp - wP * p;

            const s0 = ( 1 + wP ) * ppp + ( - 1.5 - 2 * wP ) * pp + ( - 0.5 + wP ) * p + 1;

            const s1 = ( - 1 - wN ) * ppp + ( 1.5 + wN ) * pp + 0.5 * p;

            const sN = wN * ppp - wN * pp;


            // combine data linearly


            for ( let i = 0; i !== stride; ++ i ) {


                result[ i ] =

                        sP * values[ oP + i ] +

                        s0 * values[ o0 + i ] +

                        s1 * values[ o1 + i ] +

                        sN * values[ oN + i ];


            }


            return result;


        }


    }


    class LinearInterpolant extends Interpolant {


        constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {


            super( parameterPositions, sampleValues, sampleSize, resultBuffer );


        }


        interpolate_( i1, t0, t, t1 ) {


            const result = this.resultBuffer,

                values = this.sampleValues,

                stride = this.valueSize,


                offset1 = i1 * stride,

                offset0 = offset1 - stride,


                weight1 = ( t - t0 ) / ( t1 - t0 ),

                weight0 = 1 - weight1;


            for ( let i = 0; i !== stride; ++ i ) {


                result[ i ] =

                        values[ offset0 + i ] * weight0 +

                        values[ offset1 + i ] * weight1;


            }


            return result;


        }


    }


    class DiscreteInterpolant extends Interpolant {


        constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {


            super( parameterPositions, sampleValues, sampleSize, resultBuffer );


        }


        interpolate_( i1 /*, t0, t, t1 */ ) {


            return this.copySampleValue_( i1 - 1 );


        }


    }


    class KeyframeTrack {


        constructor( name, times, values, interpolation ) {


            if ( name === undefined ) throw new Error( 'THREE.KeyframeTrack: track name is undefined' );

            if ( times === undefined || times.length === 0 ) throw new Error( 'THREE.KeyframeTrack: no keyframes in track named ' + name );


            this.name = name;


            this.times = convertArray( times, this.TimeBufferType );

            this.values = convertArray( values, this.ValueBufferType );


            this.setInterpolation( interpolation || this.DefaultInterpolation );


        }


        // Serialization (in static context, because of constructor invocation

        // and automatic invocation of .toJSON):


        static toJSON( track ) {


            const trackType = track.constructor;


            let json;


            // derived classes can define a static toJSON method

            if ( trackType.toJSON !== this.toJSON ) {


                json = trackType.toJSON( track );


            } else {


                // by default, we assume the data can be serialized as-is

                json = {


                    'name': track.name,

                    'times': convertArray( track.times, Array ),

                    'values': convertArray( track.values, Array )


                };


                const interpolation = track.getInterpolation();


                if ( interpolation !== track.DefaultInterpolation ) {


                    json.interpolation = interpolation;


                }


            }


            json.type = track.ValueTypeName; // mandatory


            return json;


        }


        InterpolantFactoryMethodDiscrete( result ) {


            return new DiscreteInterpolant( this.times, this.values, this.getValueSize(), result );


        }


        InterpolantFactoryMethodLinear( result ) {


            return new LinearInterpolant( this.times, this.values, this.getValueSize(), result );


        }


        InterpolantFactoryMethodSmooth( result ) {


            return new CubicInterpolant( this.times, this.values, this.getValueSize(), result );


        }


        setInterpolation( interpolation ) {


            let factoryMethod;


            switch ( interpolation ) {


                case InterpolateDiscrete:


                    factoryMethod = this.InterpolantFactoryMethodDiscrete;


                    break;


                case InterpolateLinear:


                    factoryMethod = this.InterpolantFactoryMethodLinear;


                    break;


                case InterpolateSmooth:


                    factoryMethod = this.InterpolantFactoryMethodSmooth;


                    break;


            }


            if ( factoryMethod === undefined ) {


                const message = 'unsupported interpolation for ' +

                    this.ValueTypeName + ' keyframe track named ' + this.name;


                if ( this.createInterpolant === undefined ) {


                    // fall back to default, unless the default itself is messed up

                    if ( interpolation !== this.DefaultInterpolation ) {


                        this.setInterpolation( this.DefaultInterpolation );


                    } else {


                        throw new Error( message ); // fatal, in this case


                    }


                }


                console.warn( 'THREE.KeyframeTrack:', message );

                return this;


            }


            this.createInterpolant = factoryMethod;


            return this;


        }


        getInterpolation() {


            switch ( this.createInterpolant ) {


                case this.InterpolantFactoryMethodDiscrete:


                    return InterpolateDiscrete;


                case this.InterpolantFactoryMethodLinear:


                    return InterpolateLinear;


                case this.InterpolantFactoryMethodSmooth:


                    return InterpolateSmooth;


            }


        }


        getValueSize() {


            return this.values.length / this.times.length;


        }


        // move all keyframes either forwards or backwards in time

        shift( timeOffset ) {


            if ( timeOffset !== 0.0 ) {


                const times = this.times;


                for ( let i = 0, n = times.length; i !== n; ++ i ) {


                    times[ i ] += timeOffset;


                }


            }


            return this;


        }


        // scale all keyframe times by a factor (useful for frame <-> seconds conversions)

        scale( timeScale ) {


            if ( timeScale !== 1.0 ) {


                const times = this.times;


                for ( let i = 0, n = times.length; i !== n; ++ i ) {


                    times[ i ] *= timeScale;


                }


            }


            return this;


        }


        // removes keyframes before and after animation without changing any values within the range [startTime, endTime].

        // IMPORTANT: We do not shift around keys to the start of the track time, because for interpolated keys this will change their values

        trim( startTime, endTime ) {


            const times = this.times,

                nKeys = times.length;


            let from = 0,

                to = nKeys - 1;


            while ( from !== nKeys && times[ from ] < startTime ) {


                ++ from;


            }


            while ( to !== - 1 && times[ to ] > endTime ) {


                -- to;


            }


            ++ to; // inclusive -> exclusive bound


            if ( from !== 0 || to !== nKeys ) {


                // empty tracks are forbidden, so keep at least one keyframe

                if ( from >= to ) {


                    to = Math.max( to, 1 );

                    from = to - 1;


                }


                const stride = this.getValueSize();

                this.times = times.slice( from, to );

                this.values = this.values.slice( from * stride, to * stride );


            }


            return this;


        }


        // ensure we do not get a GarbageInGarbageOut situation, make sure tracks are at least minimally viable

        validate() {


            let valid = true;


            const valueSize = this.getValueSize();

            if ( valueSize - Math.floor( valueSize ) !== 0 ) {


                console.error( 'THREE.KeyframeTrack: Invalid value size in track.', this );

                valid = false;


            }


            const times = this.times,

                values = this.values,


                nKeys = times.length;


            if ( nKeys === 0 ) {


                console.error( 'THREE.KeyframeTrack: Track is empty.', this );

                valid = false;


            }


            let prevTime = null;


            for ( let i = 0; i !== nKeys; i ++ ) {


                const currTime = times[ i ];


                if ( typeof currTime === 'number' && isNaN( currTime ) ) {


                    console.error( 'THREE.KeyframeTrack: Time is not a valid number.', this, i, currTime );

                    valid = false;

                    break;


                }


                if ( prevTime !== null && prevTime > currTime ) {


                    console.error( 'THREE.KeyframeTrack: Out of order keys.', this, i, currTime, prevTime );

                    valid = false;

                    break;


                }


                prevTime = currTime;


            }


            if ( values !== undefined ) {


                if ( isTypedArray( values ) ) {


                    for ( let i = 0, n = values.length; i !== n; ++ i ) {


                        const value = values[ i ];


                        if ( isNaN( value ) ) {


                            console.error( 'THREE.KeyframeTrack: Value is not a valid number.', this, i, value );

                            valid = false;

                            break;


                        }


                    }


                }


            }


            return valid;


        }


        // removes equivalent sequential keys as common in morph target sequences

        // (0,0,0,0,1,1,1,0,0,0,0,0,0,0) --> (0,0,1,1,0,0)

        optimize() {


            // times or values may be shared with other tracks, so overwriting is unsafe

            const times = this.times.slice(),

                values = this.values.slice(),

                stride = this.getValueSize(),


                smoothInterpolation = this.getInterpolation() === InterpolateSmooth,


                lastIndex = times.length - 1;


            let writeIndex = 1;


            for ( let i = 1; i < lastIndex; ++ i ) {


                let keep = false;


                const time = times[ i ];

                const timeNext = times[ i + 1 ];


                // remove adjacent keyframes scheduled at the same time


                if ( time !== timeNext && ( i !== 1 || time !== times[ 0 ] ) ) {


                    if ( ! smoothInterpolation ) {


                        // remove unnecessary keyframes same as their neighbors


                        const offset = i * stride,

                            offsetP = offset - stride,

                            offsetN = offset + stride;


                        for ( let j = 0; j !== stride; ++ j ) {


                            const value = values[ offset + j ];


                            if ( value !== values[ offsetP + j ] ||

                                value !== values[ offsetN + j ] ) {


                                keep = true;

                                break;


                            }


                        }


                    } else {


                        keep = true;


                    }


                }


                // in-place compaction


                if ( keep ) {


                    if ( i !== writeIndex ) {


                        times[ writeIndex ] = times[ i ];


                        const readOffset = i * stride,

                            writeOffset = writeIndex * stride;


                        for ( let j = 0; j !== stride; ++ j ) {


                            values[ writeOffset + j ] = values[ readOffset + j ];


                        }


                    }


                    ++ writeIndex;


                }


            }


            // flush last keyframe (compaction looks ahead)


            if ( lastIndex > 0 ) {


                times[ writeIndex ] = times[ lastIndex ];


                for ( let readOffset = lastIndex * stride, writeOffset = writeIndex * stride, j = 0; j !== stride; ++ j ) {


                    values[ writeOffset + j ] = values[ readOffset + j ];


                }


                ++ writeIndex;


            }


            if ( writeIndex !== times.length ) {


                this.times = times.slice( 0, writeIndex );

                this.values = values.slice( 0, writeIndex * stride );


            } else {


                this.times = times;

                this.values = values;


            }


            return this;


        }


        clone() {


            const times = this.times.slice();

            const values = this.values.slice();


            const TypedKeyframeTrack = this.constructor;

            const track = new TypedKeyframeTrack( this.name, times, values );


            // Interpolant argument to constructor is not saved, so copy the factory method directly.

            track.createInterpolant = this.createInterpolant;


            return track;


        }


    }


    KeyframeTrack.prototype.TimeBufferType = Float32Array;

    KeyframeTrack.prototype.ValueBufferType = Float32Array;

    KeyframeTrack.prototype.DefaultInterpolation = InterpolateLinear;


    class BooleanKeyframeTrack extends KeyframeTrack {}


    BooleanKeyframeTrack.prototype.ValueTypeName = 'bool';

    BooleanKeyframeTrack.prototype.ValueBufferType = Array;

    BooleanKeyframeTrack.prototype.DefaultInterpolation = InterpolateDiscrete;

    BooleanKeyframeTrack.prototype.InterpolantFactoryMethodLinear = undefined;

    BooleanKeyframeTrack.prototype.InterpolantFactoryMethodSmooth = undefined;


    class ColorKeyframeTrack extends KeyframeTrack {}


    ColorKeyframeTrack.prototype.ValueTypeName = 'color';


    class NumberKeyframeTrack extends KeyframeTrack {}


    NumberKeyframeTrack.prototype.ValueTypeName = 'number';


    class QuaternionLinearInterpolant extends Interpolant {


        constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {


            super( parameterPositions, sampleValues, sampleSize, resultBuffer );


        }


        interpolate_( i1, t0, t, t1 ) {


            const result = this.resultBuffer,

                values = this.sampleValues,

                stride = this.valueSize,


                alpha = ( t - t0 ) / ( t1 - t0 );


            let offset = i1 * stride;


            for ( let end = offset + stride; offset !== end; offset += 4 ) {


                Quaternion.slerpFlat( result, 0, values, offset - stride, values, offset, alpha );


            }


            return result;


        }


    }


    class QuaternionKeyframeTrack extends KeyframeTrack {


        InterpolantFactoryMethodLinear( result ) {


            return new QuaternionLinearInterpolant( this.times, this.values, this.getValueSize(), result );


        }


    }


    QuaternionKeyframeTrack.prototype.ValueTypeName = 'quaternion';

    // ValueBufferType is inherited

    QuaternionKeyframeTrack.prototype.DefaultInterpolation = InterpolateLinear;

    QuaternionKeyframeTrack.prototype.InterpolantFactoryMethodSmooth = undefined;


    class StringKeyframeTrack extends KeyframeTrack {}


    StringKeyframeTrack.prototype.ValueTypeName = 'string';

    StringKeyframeTrack.prototype.ValueBufferType = Array;

    StringKeyframeTrack.prototype.DefaultInterpolation = InterpolateDiscrete;

    StringKeyframeTrack.prototype.InterpolantFactoryMethodLinear = undefined;

    StringKeyframeTrack.prototype.InterpolantFactoryMethodSmooth = undefined;


    class VectorKeyframeTrack extends KeyframeTrack {}


    VectorKeyframeTrack.prototype.ValueTypeName = 'vector';


    class AnimationClip {


        constructor( name, duration = - 1, tracks, blendMode = NormalAnimationBlendMode ) {


            this.name = name;

            this.tracks = tracks;

            this.duration = duration;

            this.blendMode = blendMode;


            this.uuid = generateUUID();


            // this means it should figure out its duration by scanning the tracks

            if ( this.duration < 0 ) {


                this.resetDuration();


            }


        }


        static parse( json ) {


            const tracks = [],

                jsonTracks = json.tracks,

                frameTime = 1.0 / ( json.fps || 1.0 );


            for ( let i = 0, n = jsonTracks.length; i !== n; ++ i ) {


                tracks.push( parseKeyframeTrack( jsonTracks[ i ] ).scale( frameTime ) );


            }


            const clip = new this( json.name, json.duration, tracks, json.blendMode );

            clip.uuid = json.uuid;


            return clip;


        }


        static toJSON( clip ) {


            const tracks = [],

                clipTracks = clip.tracks;


            const json = {


                'name': clip.name,

                'duration': clip.duration,

                'tracks': tracks,

                'uuid': clip.uuid,

                'blendMode': clip.blendMode


            };


            for ( let i = 0, n = clipTracks.length; i !== n; ++ i ) {


                tracks.push( KeyframeTrack.toJSON( clipTracks[ i ] ) );


            }


            return json;


        }


        static CreateFromMorphTargetSequence( name, morphTargetSequence, fps, noLoop ) {


            const numMorphTargets = morphTargetSequence.length;

            const tracks = [];


            for ( let i = 0; i < numMorphTargets; i ++ ) {


                let times = [];

                let values = [];


                times.push(

                    ( i + numMorphTargets - 1 ) % numMorphTargets,

                    i,

                    ( i + 1 ) % numMorphTargets );


                values.push( 0, 1, 0 );


                const order = getKeyframeOrder( times );

                times = sortedArray( times, 1, order );

                values = sortedArray( values, 1, order );


                // if there is a key at the first frame, duplicate it as the

                // last frame as well for perfect loop.

                if ( ! noLoop && times[ 0 ] === 0 ) {


                    times.push( numMorphTargets );

                    values.push( values[ 0 ] );


                }


                tracks.push(

                    new NumberKeyframeTrack(

                        '.morphTargetInfluences[' + morphTargetSequence[ i ].name + ']',

                        times, values

                    ).scale( 1.0 / fps ) );


            }


            return new this( name, - 1, tracks );


        }


        static findByName( objectOrClipArray, name ) {


            let clipArray = objectOrClipArray;


            if ( ! Array.isArray( objectOrClipArray ) ) {


                const o = objectOrClipArray;

                clipArray = o.geometry && o.geometry.animations || o.animations;


            }


            for ( let i = 0; i < clipArray.length; i ++ ) {


                if ( clipArray[ i ].name === name ) {


                    return clipArray[ i ];


                }


            }


            return null;


        }


        static CreateClipsFromMorphTargetSequences( morphTargets, fps, noLoop ) {


            const animationToMorphTargets = {};


            // tested with https://regex101.com/ on trick sequences

            // such flamingo_flyA_003, flamingo_run1_003, crdeath0059

            const pattern = /^([\w-]*?)([\d]+)$/;


            // sort morph target names into animation groups based

            // patterns like Walk_001, Walk_002, Run_001, Run_002

            for ( let i = 0, il = morphTargets.length; i < il; i ++ ) {


                const morphTarget = morphTargets[ i ];

                const parts = morphTarget.name.match( pattern );


                if ( parts && parts.length > 1 ) {


                    const name = parts[ 1 ];


                    let animationMorphTargets = animationToMorphTargets[ name ];


                    if ( ! animationMorphTargets ) {


                        animationToMorphTargets[ name ] = animationMorphTargets = [];


                    }


                    animationMorphTargets.push( morphTarget );


                }


            }


            const clips = [];


            for ( const name in animationToMorphTargets ) {


                clips.push( this.CreateFromMorphTargetSequence( name, animationToMorphTargets[ name ], fps, noLoop ) );


            }


            return clips;


        }


        // parse the animation.hierarchy format

        static parseAnimation( animation, bones ) {


            if ( ! animation ) {


                console.error( 'THREE.AnimationClip: No animation in JSONLoader data.' );

                return null;


            }


            const addNonemptyTrack = function ( trackType, trackName, animationKeys, propertyName, destTracks ) {


                // only return track if there are actually keys.

                if ( animationKeys.length !== 0 ) {


                    const times = [];

                    const values = [];


                    flattenJSON( animationKeys, times, values, propertyName );


                    // empty keys are filtered out, so check again

                    if ( times.length !== 0 ) {


                        destTracks.push( new trackType( trackName, times, values ) );


                    }


                }


            };


            const tracks = [];


            const clipName = animation.name || 'default';

            const fps = animation.fps || 30;

            const blendMode = animation.blendMode;


            // automatic length determination in AnimationClip.

            let duration = animation.length || - 1;


            const hierarchyTracks = animation.hierarchy || [];


            for ( let h = 0; h < hierarchyTracks.length; h ++ ) {


                const animationKeys = hierarchyTracks[ h ].keys;


                // skip empty tracks

                if ( ! animationKeys || animationKeys.length === 0 ) continue;


                // process morph targets

                if ( animationKeys[ 0 ].morphTargets ) {


                    // figure out all morph targets used in this track

                    const morphTargetNames = {};


                    let k;


                    for ( k = 0; k < animationKeys.length; k ++ ) {


                        if ( animationKeys[ k ].morphTargets ) {


                            for ( let m = 0; m < animationKeys[ k ].morphTargets.length; m ++ ) {


                                morphTargetNames[ animationKeys[ k ].morphTargets[ m ] ] = - 1;


                            }


                        }


                    }


                    // create a track for each morph target with all zero

                    // morphTargetInfluences except for the keys in which

                    // the morphTarget is named.

                    for ( const morphTargetName in morphTargetNames ) {


                        const times = [];

                        const values = [];


                        for ( let m = 0; m !== animationKeys[ k ].morphTargets.length; ++ m ) {


                            const animationKey = animationKeys[ k ];


                            times.push( animationKey.time );

                            values.push( ( animationKey.morphTarget === morphTargetName ) ? 1 : 0 );


                        }


                        tracks.push( new NumberKeyframeTrack( '.morphTargetInfluence[' + morphTargetName + ']', times, values ) );


                    }


                    duration = morphTargetNames.length * fps;


                } else {


                    // ...assume skeletal animation


                    const boneName = '.bones[' + bones[ h ].name + ']';


                    addNonemptyTrack(

                        VectorKeyframeTrack, boneName + '.position',

                        animationKeys, 'pos', tracks );


                    addNonemptyTrack(

                        QuaternionKeyframeTrack, boneName + '.quaternion',

                        animationKeys, 'rot', tracks );


                    addNonemptyTrack(

                        VectorKeyframeTrack, boneName + '.scale',

                        animationKeys, 'scl', tracks );


                }


            }


            if ( tracks.length === 0 ) {


                return null;


            }


            const clip = new this( clipName, duration, tracks, blendMode );


            return clip;


        }


        resetDuration() {


            const tracks = this.tracks;

            let duration = 0;


            for ( let i = 0, n = tracks.length; i !== n; ++ i ) {


                const track = this.tracks[ i ];


                duration = Math.max( duration, track.times[ track.times.length - 1 ] );


            }


            this.duration = duration;


            return this;


        }


        trim() {


            for ( let i = 0; i < this.tracks.length; i ++ ) {


                this.tracks[ i ].trim( 0, this.duration );


            }


            return this;


        }


        validate() {


            let valid = true;


            for ( let i = 0; i < this.tracks.length; i ++ ) {


                valid = valid && this.tracks[ i ].validate();


            }


            return valid;


        }


        optimize() {


            for ( let i = 0; i < this.tracks.length; i ++ ) {


                this.tracks[ i ].optimize();


            }


            return this;


        }


        clone() {


            const tracks = [];


            for ( let i = 0; i < this.tracks.length; i ++ ) {


                tracks.push( this.tracks[ i ].clone() );


            }


            return new this.constructor( this.name, this.duration, tracks, this.blendMode );


        }


        toJSON() {


            return this.constructor.toJSON( this );


        }


    }


    function getTrackTypeForValueTypeName( typeName ) {


        switch ( typeName.toLowerCase() ) {


            case 'scalar':

            case 'double':

            case 'float':

            case 'number':

            case 'integer':


                return NumberKeyframeTrack;


            case 'vector':

            case 'vector2':

            case 'vector3':

            case 'vector4':


                return VectorKeyframeTrack;


            case 'color':


                return ColorKeyframeTrack;


            case 'quaternion':


                return QuaternionKeyframeTrack;


            case 'bool':

            case 'boolean':


                return BooleanKeyframeTrack;


            case 'string':


                return StringKeyframeTrack;


        }


        throw new Error( 'THREE.KeyframeTrack: Unsupported typeName: ' + typeName );


    }


    function parseKeyframeTrack( json ) {


        if ( json.type === undefined ) {


            throw new Error( 'THREE.KeyframeTrack: track type undefined, can not parse' );


        }


        const trackType = getTrackTypeForValueTypeName( json.type );


        if ( json.times === undefined ) {


            const times = [], values = [];


            flattenJSON( json.keys, times, values, 'value' );


            json.times = times;

            json.values = values;


        }


        // derived classes can define a static parse method

        if ( trackType.parse !== undefined ) {


            return trackType.parse( json );


        } else {


            // by default, we assume a constructor compatible with the base

            return new trackType( json.name, json.times, json.values, json.interpolation );


        }


    }


    const Cache = {


        enabled: false,


        files: {},


        add: function ( key, file ) {


            if ( this.enabled === false ) return;


            // console.log( 'THREE.Cache', 'Adding key:', key );


            this.files[ key ] = file;


        },


        get: function ( key ) {


            if ( this.enabled === false ) return;


            // console.log( 'THREE.Cache', 'Checking key:', key );


            return this.files[ key ];


        },


        remove: function ( key ) {


            delete this.files[ key ];


        },


        clear: function () {


            this.files = {};


        }


    };


    class LoadingManager {


        constructor( onLoad, onProgress, onError ) {


            const scope = this;


            let isLoading = false;

            let itemsLoaded = 0;

            let itemsTotal = 0;

            let urlModifier = undefined;

            const handlers = [];


            // Refer to #5689 for the reason why we don't set .onStart

            // in the constructor


            this.onStart = undefined;

            this.onLoad = onLoad;

            this.onProgress = onProgress;

            this.onError = onError;


            this.itemStart = function ( url ) {


                itemsTotal ++;


                if ( isLoading === false ) {


                    if ( scope.onStart !== undefined ) {


                        scope.onStart( url, itemsLoaded, itemsTotal );


                    }


                }


                isLoading = true;


            };


            this.itemEnd = function ( url ) {


                itemsLoaded ++;


                if ( scope.onProgress !== undefined ) {


                    scope.onProgress( url, itemsLoaded, itemsTotal );


                }


                if ( itemsLoaded === itemsTotal ) {


                    isLoading = false;


                    if ( scope.onLoad !== undefined ) {


                        scope.onLoad();


                    }


                }


            };


            this.itemError = function ( url ) {


                if ( scope.onError !== undefined ) {


                    scope.onError( url );


                }


            };


            this.resolveURL = function ( url ) {


                if ( urlModifier ) {


                    return urlModifier( url );


                }


                return url;


            };


            this.setURLModifier = function ( transform ) {


                urlModifier = transform;


                return this;


            };


            this.addHandler = function ( regex, loader ) {


                handlers.push( regex, loader );


                return this;


            };


            this.removeHandler = function ( regex ) {


                const index = handlers.indexOf( regex );


                if ( index !== - 1 ) {


                    handlers.splice( index, 2 );


                }


                return this;


            };


            this.getHandler = function ( file ) {


                for ( let i = 0, l = handlers.length; i < l; i += 2 ) {


                    const regex = handlers[ i ];

                    const loader = handlers[ i + 1 ];


                    if ( regex.global ) regex.lastIndex = 0; // see #17920


                    if ( regex.test( file ) ) {


                        return loader;


                    }


                }


                return null;


            };


        }


    }


    const DefaultLoadingManager = /*@__PURE__*/ new LoadingManager();


    class Loader {


        constructor( manager ) {


            this.manager = ( manager !== undefined ) ? manager : DefaultLoadingManager;


            this.crossOrigin = 'anonymous';

            this.withCredentials = false;

            this.path = '';

            this.resourcePath = '';

            this.requestHeader = {};


        }


        load( /* url, onLoad, onProgress, onError */ ) {}


        loadAsync( url, onProgress ) {


            const scope = this;


            return new Promise( function ( resolve, reject ) {


                scope.load( url, resolve, onProgress, reject );


            } );


        }


        parse( /* data */ ) {}


        setCrossOrigin( crossOrigin ) {


            this.crossOrigin = crossOrigin;

            return this;


        }


        setWithCredentials( value ) {


            this.withCredentials = value;

            return this;


        }


        setPath( path ) {


            this.path = path;

            return this;


        }


        setResourcePath( resourcePath ) {


            this.resourcePath = resourcePath;

            return this;


        }


        setRequestHeader( requestHeader ) {


            this.requestHeader = requestHeader;

            return this;


        }


    }


    Loader.DEFAULT_MATERIAL_NAME = '__DEFAULT';


    const loading = {};


    class HttpError extends Error {


        constructor( message, response ) {


            super( message );

            this.response = response;


        }


    }


    class FileLoader extends Loader {


        constructor( manager ) {


            super( manager );


        }


        load( url, onLoad, onProgress, onError ) {


            if ( url === undefined ) url = '';


            if ( this.path !== undefined ) url = this.path + url;


            url = this.manager.resolveURL( url );


            const cached = Cache.get( url );


            if ( cached !== undefined ) {


                this.manager.itemStart( url );


                setTimeout( () => {


                    if ( onLoad ) onLoad( cached );


                    this.manager.itemEnd( url );


                }, 0 );


                return cached;


            }


            // Check if request is duplicate


            if ( loading[ url ] !== undefined ) {


                loading[ url ].push( {


                    onLoad: onLoad,

                    onProgress: onProgress,

                    onError: onError


                } );


                return;


            }


            // Initialise array for duplicate requests

            loading[ url ] = [];


            loading[ url ].push( {

                onLoad: onLoad,

                onProgress: onProgress,

                onError: onError,

            } );


            // create request

            const req = new Request( url, {

                headers: new Headers( this.requestHeader ),

                credentials: this.withCredentials ? 'include' : 'same-origin',

                // An abort controller could be added within a future PR

            } );


            // record states ( avoid data race )

            const mimeType = this.mimeType;

            const responseType = this.responseType;


            // start the fetch

            fetch( req )

                .then( response => {


                    if ( response.status === 200 || response.status === 0 ) {


                        // Some browsers return HTTP Status 0 when using non-http protocol

                        // e.g. 'file://' or 'data://'. Handle as success.


                        if ( response.status === 0 ) {


                            console.warn( 'THREE.FileLoader: HTTP Status 0 received.' );


                        }


                        // Workaround: Checking if response.body === undefined for Alipay browser #23548


                        if ( typeof ReadableStream === 'undefined' || response.body === undefined || response.body.getReader === undefined ) {


                            return response;


                        }


                        const callbacks = loading[ url ];

                        const reader = response.body.getReader();


                        // Nginx needs X-File-Size check

                        // https://serverfault.com/questions/482875/why-does-nginx-remove-content-length-header-for-chunked-content

                        const contentLength = response.headers.get( 'Content-Length' ) || response.headers.get( 'X-File-Size' );

                        const total = contentLength ? parseInt( contentLength ) : 0;

                        const lengthComputable = total !== 0;

                        let loaded = 0;


                        // periodically read data into the new stream tracking while download progress

                        const stream = new ReadableStream( {

                            start( controller ) {


                                readData();


                                function readData() {


                                    reader.read().then( ( { done, value } ) => {


                                        if ( done ) {


                                            controller.close();


                                        } else {


                                            loaded += value.byteLength;


                                            const event = new ProgressEvent( 'progress', { lengthComputable, loaded, total } );

                                            for ( let i = 0, il = callbacks.length; i < il; i ++ ) {


                                                const callback = callbacks[ i ];

                                                if ( callback.onProgress ) callback.onProgress( event );


                                            }


                                            controller.enqueue( value );

                                            readData();


                                        }


                                    } );


                                }


                            }


                        } );


                        return new Response( stream );


                    } else {


                        throw new HttpError( `fetch for "${response.url}" responded with ${response.status}: ${response.statusText}`, response );


                    }


                } )

                .then( response => {


                    switch ( responseType ) {


                        case 'arraybuffer':


                            return response.arrayBuffer();


                        case 'blob':


                            return response.blob();


                        case 'document':


                            return response.text()

                                .then( text => {


                                    const parser = new DOMParser();

                                    return parser.parseFromString( text, mimeType );


                                } );


                        case 'json':


                            return response.json();


                        default:


                            if ( mimeType === undefined ) {


                                return response.text();


                            } else {


                                // sniff encoding

                                const re = /charset="?([^;"\s]*)"?/i;

                                const exec = re.exec( mimeType );

                                const label = exec && exec[ 1 ] ? exec[ 1 ].toLowerCase() : undefined;

                                const decoder = new TextDecoder( label );

                                return response.arrayBuffer().then( ab => decoder.decode( ab ) );


                            }


                    }


                } )

                .then( data => {


                    // Add to cache only on HTTP success, so that we do not cache

                    // error response bodies as proper responses to requests.

                    Cache.add( url, data );


                    const callbacks = loading[ url ];

                    delete loading[ url ];


                    for ( let i = 0, il = callbacks.length; i < il; i ++ ) {


                        const callback = callbacks[ i ];

                        if ( callback.onLoad ) callback.onLoad( data );


                    }


                } )

                .catch( err => {


                    // Abort errors and other errors are handled the same


                    const callbacks = loading[ url ];


                    if ( callbacks === undefined ) {


                        // When onLoad was called and url was deleted in `loading`

                        this.manager.itemError( url );

                        throw err;


                    }


                    delete loading[ url ];


                    for ( let i = 0, il = callbacks.length; i < il; i ++ ) {


                        const callback = callbacks[ i ];

                        if ( callback.onError ) callback.onError( err );


                    }


                    this.manager.itemError( url );


                } )

                .finally( () => {


                    this.manager.itemEnd( url );


                } );


            this.manager.itemStart( url );


        }


        setResponseType( value ) {


            this.responseType = value;

            return this;


        }


        setMimeType( value ) {


            this.mimeType = value;

            return this;


        }


    }


    class AnimationLoader extends Loader {


        constructor( manager ) {


            super( manager );


        }


        load( url, onLoad, onProgress, onError ) {


            const scope = this;


            const loader = new FileLoader( this.manager );

            loader.setPath( this.path );

            loader.setRequestHeader( this.requestHeader );

            loader.setWithCredentials( this.withCredentials );

            loader.load( url, function ( text ) {


                try {


                    onLoad( scope.parse( JSON.parse( text ) ) );


                } catch ( e ) {


                    if ( onError ) {


                        onError( e );


                    } else {


                        console.error( e );


                    }


                    scope.manager.itemError( url );


                }


            }, onProgress, onError );


        }


        parse( json ) {


            const animations = [];


            for ( let i = 0; i < json.length; i ++ ) {


                const clip = AnimationClip.parse( json[ i ] );


                animations.push( clip );


            }


            return animations;


        }


    }


    class CompressedTextureLoader extends Loader {


        constructor( manager ) {


            super( manager );


        }


        load( url, onLoad, onProgress, onError ) {


            const scope = this;


            const images = [];


            const texture = new CompressedTexture();


            const loader = new FileLoader( this.manager );

            loader.setPath( this.path );

            loader.setResponseType( 'arraybuffer' );

            loader.setRequestHeader( this.requestHeader );

            loader.setWithCredentials( scope.withCredentials );


            let loaded = 0;


            function loadTexture( i ) {


                loader.load( url[ i ], function ( buffer ) {


                    const texDatas = scope.parse( buffer, true );


                    images[ i ] = {

                        width: texDatas.width,

                        height: texDatas.height,

                        format: texDatas.format,

                        mipmaps: texDatas.mipmaps

                    };


                    loaded += 1;


                    if ( loaded === 6 ) {


                        if ( texDatas.mipmapCount === 1 ) texture.minFilter = LinearFilter;


                        texture.image = images;

                        texture.format = texDatas.format;

                        texture.needsUpdate = true;


                        if ( onLoad ) onLoad( texture );


                    }


                }, onProgress, onError );


            }


            if ( Array.isArray( url ) ) {


                for ( let i = 0, il = url.length; i < il; ++ i ) {


                    loadTexture( i );


                }


            } else {


                // compressed cubemap texture stored in a single DDS file


                loader.load( url, function ( buffer ) {


                    const texDatas = scope.parse( buffer, true );


                    if ( texDatas.isCubemap ) {


                        const faces = texDatas.mipmaps.length / texDatas.mipmapCount;


                        for ( let f = 0; f < faces; f ++ ) {


                            images[ f ] = { mipmaps: [] };


                            for ( let i = 0; i < texDatas.mipmapCount; i ++ ) {


                                images[ f ].mipmaps.push( texDatas.mipmaps[ f * texDatas.mipmapCount + i ] );

                                images[ f ].format = texDatas.format;

                                images[ f ].width = texDatas.width;

                                images[ f ].height = texDatas.height;


                            }


                        }


                        texture.image = images;


                    } else {


                        texture.image.width = texDatas.width;

                        texture.image.height = texDatas.height;

                        texture.mipmaps = texDatas.mipmaps;


                    }


                    if ( texDatas.mipmapCount === 1 ) {


                        texture.minFilter = LinearFilter;


                    }


                    texture.format = texDatas.format;

                    texture.needsUpdate = true;


                    if ( onLoad ) onLoad( texture );


                }, onProgress, onError );


            }


            return texture;


        }


    }


    class ImageLoader extends Loader {


        constructor( manager ) {


            super( manager );


        }


        load( url, onLoad, onProgress, onError ) {


            if ( this.path !== undefined ) url = this.path + url;


            url = this.manager.resolveURL( url );


            const scope = this;


            const cached = Cache.get( url );


            if ( cached !== undefined ) {


                scope.manager.itemStart( url );


                setTimeout( function () {


                    if ( onLoad ) onLoad( cached );


                    scope.manager.itemEnd( url );


                }, 0 );


                return cached;


            }


            const image = createElementNS( 'img' );


            function onImageLoad() {


                removeEventListeners();


                Cache.add( url, this );


                if ( onLoad ) onLoad( this );


                scope.manager.itemEnd( url );


            }


            function onImageError( event ) {


                removeEventListeners();


                if ( onError ) onError( event );


                scope.manager.itemError( url );

                scope.manager.itemEnd( url );


            }


            function removeEventListeners() {


                image.removeEventListener( 'load', onImageLoad, false );

                image.removeEventListener( 'error', onImageError, false );


            }


            image.addEventListener( 'load', onImageLoad, false );

            image.addEventListener( 'error', onImageError, false );


            if ( url.slice( 0, 5 ) !== 'data:' ) {


                if ( this.crossOrigin !== undefined ) image.crossOrigin = this.crossOrigin;


            }


            scope.manager.itemStart( url );


            image.src = url;


            return image;


        }


    }


    class CubeTextureLoader extends Loader {


        constructor( manager ) {


            super( manager );


        }


        load( urls, onLoad, onProgress, onError ) {


            const texture = new CubeTexture();

            texture.colorSpace = SRGBColorSpace;


            const loader = new ImageLoader( this.manager );

            loader.setCrossOrigin( this.crossOrigin );

            loader.setPath( this.path );


            let loaded = 0;


            function loadTexture( i ) {


                loader.load( urls[ i ], function ( image ) {


                    texture.images[ i ] = image;


                    loaded ++;


                    if ( loaded === 6 ) {


                        texture.needsUpdate = true;


                        if ( onLoad ) onLoad( texture );


                    }


                }, undefined, onError );


            }


            for ( let i = 0; i < urls.length; ++ i ) {


                loadTexture( i );


            }


            return texture;


        }


    }


    class DataTextureLoader extends Loader {


        constructor( manager ) {


            super( manager );


        }


        load( url, onLoad, onProgress, onError ) {


            const scope = this;


            const texture = new DataTexture();


            const loader = new FileLoader( this.manager );

            loader.setResponseType( 'arraybuffer' );

            loader.setRequestHeader( this.requestHeader );

            loader.setPath( this.path );

            loader.setWithCredentials( scope.withCredentials );

            loader.load( url, function ( buffer ) {


                let texData;


                try {


                    texData = scope.parse( buffer );


                } catch ( error ) {


                    if ( onError !== undefined ) {


                        onError( error );


                    } else {


                        console.error( error );

                        return;


                    }


                }


                if ( texData.image !== undefined ) {


                    texture.image = texData.image;


                } else if ( texData.data !== undefined ) {


                    texture.image.width = texData.width;

                    texture.image.height = texData.height;

                    texture.image.data = texData.data;


                }


                texture.wrapS = texData.wrapS !== undefined ? texData.wrapS : ClampToEdgeWrapping;

                texture.wrapT = texData.wrapT !== undefined ? texData.wrapT : ClampToEdgeWrapping;


                texture.magFilter = texData.magFilter !== undefined ? texData.magFilter : LinearFilter;

                texture.minFilter = texData.minFilter !== undefined ? texData.minFilter : LinearFilter;


                texture.anisotropy = texData.anisotropy !== undefined ? texData.anisotropy : 1;


                if ( texData.colorSpace !== undefined ) {


                    texture.colorSpace = texData.colorSpace;


                } else if ( texData.encoding !== undefined ) { // @deprecated, r152


                    texture.encoding = texData.encoding;


                }


                if ( texData.flipY !== undefined ) {


                    texture.flipY = texData.flipY;


                }


                if ( texData.format !== undefined ) {


                    texture.format = texData.format;


                }


                if ( texData.type !== undefined ) {


                    texture.type = texData.type;


                }


                if ( texData.mipmaps !== undefined ) {


                    texture.mipmaps = texData.mipmaps;

                    texture.minFilter = LinearMipmapLinearFilter; // presumably...


                }


                if ( texData.mipmapCount === 1 ) {


                    texture.minFilter = LinearFilter;


                }


                if ( texData.generateMipmaps !== undefined ) {


                    texture.generateMipmaps = texData.generateMipmaps;


                }


                texture.needsUpdate = true;


                if ( onLoad ) onLoad( texture, texData );


            }, onProgress, onError );


            return texture;


        }


    }


    class TextureLoader extends Loader {


        constructor( manager ) {


            super( manager );


        }


        load( url, onLoad, onProgress, onError ) {


            const texture = new Texture();


            const loader = new ImageLoader( this.manager );

            loader.setCrossOrigin( this.crossOrigin );

            loader.setPath( this.path );


            loader.load( url, function ( image ) {


                texture.image = image;

                texture.needsUpdate = true;


                if ( onLoad !== undefined ) {


                    onLoad( texture );


                }


            }, onProgress, onError );


            return texture;


        }


    }


    class Light extends Object3D {


        constructor( color, intensity = 1 ) {


            super();


            this.isLight = true;


            this.type = 'Light';


            this.color = new Color( color );

            this.intensity = intensity;


        }


        dispose() {


            // Empty here in base class; some subclasses override.


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.color.copy( source.color );

            this.intensity = source.intensity;


            return this;


        }


        toJSON( meta ) {


            const data = super.toJSON( meta );


            data.object.color = this.color.getHex();

            data.object.intensity = this.intensity;


            if ( this.groundColor !== undefined ) data.object.groundColor = this.groundColor.getHex();


            if ( this.distance !== undefined ) data.object.distance = this.distance;

            if ( this.angle !== undefined ) data.object.angle = this.angle;

            if ( this.decay !== undefined ) data.object.decay = this.decay;

            if ( this.penumbra !== undefined ) data.object.penumbra = this.penumbra;


            if ( this.shadow !== undefined ) data.object.shadow = this.shadow.toJSON();


            return data;


        }


    }


    class HemisphereLight extends Light {


        constructor( skyColor, groundColor, intensity ) {


            super( skyColor, intensity );


            this.isHemisphereLight = true;


            this.type = 'HemisphereLight';


            this.position.copy( Object3D.DEFAULT_UP );

            this.updateMatrix();


            this.groundColor = new Color( groundColor );


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.groundColor.copy( source.groundColor );


            return this;


        }


    }


    const _projScreenMatrix$1 = /*@__PURE__*/ new Matrix4();

    const _lightPositionWorld$1 = /*@__PURE__*/ new Vector3();

    const _lookTarget$1 = /*@__PURE__*/ new Vector3();


    class LightShadow {


        constructor( camera ) {


            this.camera = camera;


            this.bias = 0;

            this.normalBias = 0;

            this.radius = 1;

            this.blurSamples = 8;


            this.mapSize = new Vector2( 512, 512 );


            this.map = null;

            this.mapPass = null;

            this.matrix = new Matrix4();


            this.autoUpdate = true;

            this.needsUpdate = false;


            this._frustum = new Frustum();

            this._frameExtents = new Vector2( 1, 1 );


            this._viewportCount = 1;


            this._viewports = [


                new Vector4( 0, 0, 1, 1 )


            ];


        }


        getViewportCount() {


            return this._viewportCount;


        }


        getFrustum() {


            return this._frustum;


        }


        updateMatrices( light ) {


            const shadowCamera = this.camera;

            const shadowMatrix = this.matrix;


            _lightPositionWorld$1.setFromMatrixPosition( light.matrixWorld );

            shadowCamera.position.copy( _lightPositionWorld$1 );


            _lookTarget$1.setFromMatrixPosition( light.target.matrixWorld );

            shadowCamera.lookAt( _lookTarget$1 );

            shadowCamera.updateMatrixWorld();


            _projScreenMatrix$1.multiplyMatrices( shadowCamera.projectionMatrix, shadowCamera.matrixWorldInverse );

            this._frustum.setFromProjectionMatrix( _projScreenMatrix$1 );


            shadowMatrix.set(

                0.5, 0.0, 0.0, 0.5,

                0.0, 0.5, 0.0, 0.5,

                0.0, 0.0, 0.5, 0.5,

                0.0, 0.0, 0.0, 1.0

            );


            shadowMatrix.multiply( _projScreenMatrix$1 );


        }


        getViewport( viewportIndex ) {


            return this._viewports[ viewportIndex ];


        }


        getFrameExtents() {


            return this._frameExtents;


        }


        dispose() {


            if ( this.map ) {


                this.map.dispose();


            }


            if ( this.mapPass ) {


                this.mapPass.dispose();


            }


        }


        copy( source ) {


            this.camera = source.camera.clone();


            this.bias = source.bias;

            this.radius = source.radius;


            this.mapSize.copy( source.mapSize );


            return this;


        }


        clone() {


            return new this.constructor().copy( this );


        }


        toJSON() {


            const object = {};


            if ( this.bias !== 0 ) object.bias = this.bias;

            if ( this.normalBias !== 0 ) object.normalBias = this.normalBias;

            if ( this.radius !== 1 ) object.radius = this.radius;

            if ( this.mapSize.x !== 512 || this.mapSize.y !== 512 ) object.mapSize = this.mapSize.toArray();


            object.camera = this.camera.toJSON( false ).object;

            delete object.camera.matrix;


            return object;


        }


    }


    class SpotLightShadow extends LightShadow {


        constructor() {


            super( new PerspectiveCamera( 50, 1, 0.5, 500 ) );


            this.isSpotLightShadow = true;


            this.focus = 1;


        }


        updateMatrices( light ) {


            const camera = this.camera;


            const fov = RAD2DEG * 2 * light.angle * this.focus;

            const aspect = this.mapSize.width / this.mapSize.height;

            const far = light.distance || camera.far;


            if ( fov !== camera.fov || aspect !== camera.aspect || far !== camera.far ) {


                camera.fov = fov;

                camera.aspect = aspect;

                camera.far = far;

                camera.updateProjectionMatrix();


            }


            super.updateMatrices( light );


        }


        copy( source ) {


            super.copy( source );


            this.focus = source.focus;


            return this;


        }


    }


    class SpotLight extends Light {


        constructor( color, intensity, distance = 0, angle = Math.PI / 3, penumbra = 0, decay = 2 ) {


            super( color, intensity );


            this.isSpotLight = true;


            this.type = 'SpotLight';


            this.position.copy( Object3D.DEFAULT_UP );

            this.updateMatrix();


            this.target = new Object3D();


            this.distance = distance;

            this.angle = angle;

            this.penumbra = penumbra;

            this.decay = decay;


            this.map = null;


            this.shadow = new SpotLightShadow();


        }


        get power() {


            // compute the light's luminous power (in lumens) from its intensity (in candela)

            // by convention for a spotlight, luminous power (lm) = π * luminous intensity (cd)

            return this.intensity * Math.PI;


        }


        set power( power ) {


            // set the light's intensity (in candela) from the desired luminous power (in lumens)

            this.intensity = power / Math.PI;


        }


        dispose() {


            this.shadow.dispose();


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.distance = source.distance;

            this.angle = source.angle;

            this.penumbra = source.penumbra;

            this.decay = source.decay;


            this.target = source.target.clone();


            this.shadow = source.shadow.clone();


            return this;


        }


    }


    const _projScreenMatrix = /*@__PURE__*/ new Matrix4();

    const _lightPositionWorld = /*@__PURE__*/ new Vector3();

    const _lookTarget = /*@__PURE__*/ new Vector3();


    class PointLightShadow extends LightShadow {


        constructor() {


            super( new PerspectiveCamera( 90, 1, 0.5, 500 ) );


            this.isPointLightShadow = true;


            this._frameExtents = new Vector2( 4, 2 );


            this._viewportCount = 6;


            this._viewports = [

                // These viewports map a cube-map onto a 2D texture with the

                // following orientation:

                //

                //  xzXZ

                //   y Y

                //

                // X - Positive x direction

                // x - Negative x direction

                // Y - Positive y direction

                // y - Negative y direction

                // Z - Positive z direction

                // z - Negative z direction


                // positive X

                new Vector4( 2, 1, 1, 1 ),

                // negative X

                new Vector4( 0, 1, 1, 1 ),

                // positive Z

                new Vector4( 3, 1, 1, 1 ),

                // negative Z

                new Vector4( 1, 1, 1, 1 ),

                // positive Y

                new Vector4( 3, 0, 1, 1 ),

                // negative Y

                new Vector4( 1, 0, 1, 1 )

            ];


            this._cubeDirections = [

                new Vector3( 1, 0, 0 ), new Vector3( - 1, 0, 0 ), new Vector3( 0, 0, 1 ),

                new Vector3( 0, 0, - 1 ), new Vector3( 0, 1, 0 ), new Vector3( 0, - 1, 0 )

            ];


            this._cubeUps = [

                new Vector3( 0, 1, 0 ), new Vector3( 0, 1, 0 ), new Vector3( 0, 1, 0 ),

                new Vector3( 0, 1, 0 ), new Vector3( 0, 0, 1 ), new Vector3( 0, 0, - 1 )

            ];


        }


        updateMatrices( light, viewportIndex = 0 ) {


            const camera = this.camera;

            const shadowMatrix = this.matrix;


            const far = light.distance || camera.far;


            if ( far !== camera.far ) {


                camera.far = far;

                camera.updateProjectionMatrix();


            }


            _lightPositionWorld.setFromMatrixPosition( light.matrixWorld );

            camera.position.copy( _lightPositionWorld );


            _lookTarget.copy( camera.position );

            _lookTarget.add( this._cubeDirections[ viewportIndex ] );

            camera.up.copy( this._cubeUps[ viewportIndex ] );

            camera.lookAt( _lookTarget );

            camera.updateMatrixWorld();


            shadowMatrix.makeTranslation( - _lightPositionWorld.x, - _lightPositionWorld.y, - _lightPositionWorld.z );


            _projScreenMatrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );

            this._frustum.setFromProjectionMatrix( _projScreenMatrix );


        }


    }


    class PointLight extends Light {


        constructor( color, intensity, distance = 0, decay = 2 ) {


            super( color, intensity );


            this.isPointLight = true;


            this.type = 'PointLight';


            this.distance = distance;

            this.decay = decay;


            this.shadow = new PointLightShadow();


        }


        get power() {


            // compute the light's luminous power (in lumens) from its intensity (in candela)

            // for an isotropic light source, luminous power (lm) = 4 π luminous intensity (cd)

            return this.intensity * 4 * Math.PI;


        }


        set power( power ) {


            // set the light's intensity (in candela) from the desired luminous power (in lumens)

            this.intensity = power / ( 4 * Math.PI );


        }


        dispose() {


            this.shadow.dispose();


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.distance = source.distance;

            this.decay = source.decay;


            this.shadow = source.shadow.clone();


            return this;


        }


    }


    class DirectionalLightShadow extends LightShadow {


        constructor() {


            super( new OrthographicCamera( - 5, 5, 5, - 5, 0.5, 500 ) );


            this.isDirectionalLightShadow = true;


        }


    }


    class DirectionalLight extends Light {


        constructor( color, intensity ) {


            super( color, intensity );


            this.isDirectionalLight = true;


            this.type = 'DirectionalLight';


            this.position.copy( Object3D.DEFAULT_UP );

            this.updateMatrix();


            this.target = new Object3D();


            this.shadow = new DirectionalLightShadow();


        }


        dispose() {


            this.shadow.dispose();


        }


        copy( source ) {


            super.copy( source );


            this.target = source.target.clone();

            this.shadow = source.shadow.clone();


            return this;


        }


    }


    class AmbientLight extends Light {


        constructor( color, intensity ) {


            super( color, intensity );


            this.isAmbientLight = true;


            this.type = 'AmbientLight';


        }


    }


    class RectAreaLight extends Light {


        constructor( color, intensity, width = 10, height = 10 ) {


            super( color, intensity );


            this.isRectAreaLight = true;


            this.type = 'RectAreaLight';


            this.width = width;

            this.height = height;


        }


        get power() {


            // compute the light's luminous power (in lumens) from its intensity (in nits)

            return this.intensity * this.width * this.height * Math.PI;


        }


        set power( power ) {


            // set the light's intensity (in nits) from the desired luminous power (in lumens)

            this.intensity = power / ( this.width * this.height * Math.PI );


        }


        copy( source ) {


            super.copy( source );


            this.width = source.width;

            this.height = source.height;


            return this;


        }


        toJSON( meta ) {


            const data = super.toJSON( meta );


            data.object.width = this.width;

            data.object.height = this.height;


            return data;


        }


    }


    // 3-band SH defined by 9 coefficients


    class SphericalHarmonics3 {


        constructor() {


            this.isSphericalHarmonics3 = true;


            this.coefficients = [];


            for ( let i = 0; i < 9; i ++ ) {


                this.coefficients.push( new Vector3() );


            }


        }


        set( coefficients ) {


            for ( let i = 0; i < 9; i ++ ) {


                this.coefficients[ i ].copy( coefficients[ i ] );


            }


            return this;


        }


        zero() {


            for ( let i = 0; i < 9; i ++ ) {


                this.coefficients[ i ].set( 0, 0, 0 );


            }


            return this;


        }


        // get the radiance in the direction of the normal

        // target is a Vector3

        getAt( normal, target ) {


            // normal is assumed to be unit length


            const x = normal.x, y = normal.y, z = normal.z;


            const coeff = this.coefficients;


            // band 0

            target.copy( coeff[ 0 ] ).multiplyScalar( 0.282095 );


            // band 1

            target.addScaledVector( coeff[ 1 ], 0.488603 * y );

            target.addScaledVector( coeff[ 2 ], 0.488603 * z );

            target.addScaledVector( coeff[ 3 ], 0.488603 * x );


            // band 2

            target.addScaledVector( coeff[ 4 ], 1.092548 * ( x * y ) );

            target.addScaledVector( coeff[ 5 ], 1.092548 * ( y * z ) );

            target.addScaledVector( coeff[ 6 ], 0.315392 * ( 3.0 * z * z - 1.0 ) );

            target.addScaledVector( coeff[ 7 ], 1.092548 * ( x * z ) );

            target.addScaledVector( coeff[ 8 ], 0.546274 * ( x * x - y * y ) );


            return target;


        }


        // get the irradiance (radiance convolved with cosine lobe) in the direction of the normal

        // target is a Vector3

        // https://graphics.stanford.edu/papers/envmap/envmap.pdf

        getIrradianceAt( normal, target ) {


            // normal is assumed to be unit length


            const x = normal.x, y = normal.y, z = normal.z;


            const coeff = this.coefficients;


            // band 0

            target.copy( coeff[ 0 ] ).multiplyScalar( 0.886227 ); // π * 0.282095


            // band 1

            target.addScaledVector( coeff[ 1 ], 2.0 * 0.511664 * y ); // ( 2 * π / 3 ) * 0.488603

            target.addScaledVector( coeff[ 2 ], 2.0 * 0.511664 * z );

            target.addScaledVector( coeff[ 3 ], 2.0 * 0.511664 * x );


            // band 2

            target.addScaledVector( coeff[ 4 ], 2.0 * 0.429043 * x * y ); // ( π / 4 ) * 1.092548

            target.addScaledVector( coeff[ 5 ], 2.0 * 0.429043 * y * z );

            target.addScaledVector( coeff[ 6 ], 0.743125 * z * z - 0.247708 ); // ( π / 4 ) * 0.315392 * 3

            target.addScaledVector( coeff[ 7 ], 2.0 * 0.429043 * x * z );

            target.addScaledVector( coeff[ 8 ], 0.429043 * ( x * x - y * y ) ); // ( π / 4 ) * 0.546274


            return target;


        }


        add( sh ) {


            for ( let i = 0; i < 9; i ++ ) {


                this.coefficients[ i ].add( sh.coefficients[ i ] );


            }


            return this;


        }


        addScaledSH( sh, s ) {


            for ( let i = 0; i < 9; i ++ ) {


                this.coefficients[ i ].addScaledVector( sh.coefficients[ i ], s );


            }


            return this;


        }


        scale( s ) {


            for ( let i = 0; i < 9; i ++ ) {


                this.coefficients[ i ].multiplyScalar( s );


            }


            return this;


        }


        lerp( sh, alpha ) {


            for ( let i = 0; i < 9; i ++ ) {


                this.coefficients[ i ].lerp( sh.coefficients[ i ], alpha );


            }


            return this;


        }


        equals( sh ) {


            for ( let i = 0; i < 9; i ++ ) {


                if ( ! this.coefficients[ i ].equals( sh.coefficients[ i ] ) ) {


                    return false;


                }


            }


            return true;


        }


        copy( sh ) {


            return this.set( sh.coefficients );


        }


        clone() {


            return new this.constructor().copy( this );


        }


        fromArray( array, offset = 0 ) {


            const coefficients = this.coefficients;


            for ( let i = 0; i < 9; i ++ ) {


                coefficients[ i ].fromArray( array, offset + ( i * 3 ) );


            }


            return this;


        }


        toArray( array = [], offset = 0 ) {


            const coefficients = this.coefficients;


            for ( let i = 0; i < 9; i ++ ) {


                coefficients[ i ].toArray( array, offset + ( i * 3 ) );


            }


            return array;


        }


        // evaluate the basis functions

        // shBasis is an Array[ 9 ]

        static getBasisAt( normal, shBasis ) {


            // normal is assumed to be unit length


            const x = normal.x, y = normal.y, z = normal.z;


            // band 0

            shBasis[ 0 ] = 0.282095;


            // band 1

            shBasis[ 1 ] = 0.488603 * y;

            shBasis[ 2 ] = 0.488603 * z;

            shBasis[ 3 ] = 0.488603 * x;


            // band 2

            shBasis[ 4 ] = 1.092548 * x * y;

            shBasis[ 5 ] = 1.092548 * y * z;

            shBasis[ 6 ] = 0.315392 * ( 3 * z * z - 1 );

            shBasis[ 7 ] = 1.092548 * x * z;

            shBasis[ 8 ] = 0.546274 * ( x * x - y * y );


        }


    }


    class LightProbe extends Light {


        constructor( sh = new SphericalHarmonics3(), intensity = 1 ) {


            super( undefined, intensity );


            this.isLightProbe = true;


            this.sh = sh;


        }


        copy( source ) {


            super.copy( source );


            this.sh.copy( source.sh );


            return this;


        }


        fromJSON( json ) {


            this.intensity = json.intensity; // TODO: Move this bit to Light.fromJSON();

            this.sh.fromArray( json.sh );


            return this;


        }


        toJSON( meta ) {


            const data = super.toJSON( meta );


            data.object.sh = this.sh.toArray();


            return data;


        }


    }


    class MaterialLoader extends Loader {


        constructor( manager ) {


            super( manager );

            this.textures = {};


        }


        load( url, onLoad, onProgress, onError ) {


            const scope = this;


            const loader = new FileLoader( scope.manager );

            loader.setPath( scope.path );

            loader.setRequestHeader( scope.requestHeader );

            loader.setWithCredentials( scope.withCredentials );

            loader.load( url, function ( text ) {


                try {


                    onLoad( scope.parse( JSON.parse( text ) ) );


                } catch ( e ) {


                    if ( onError ) {


                        onError( e );


                    } else {


                        console.error( e );


                    }


                    scope.manager.itemError( url );


                }


            }, onProgress, onError );


        }


        parse( json ) {


            const textures = this.textures;


            function getTexture( name ) {


                if ( textures[ name ] === undefined ) {


                    console.warn( 'THREE.MaterialLoader: Undefined texture', name );


                }


                return textures[ name ];


            }


            const material = MaterialLoader.createMaterialFromType( json.type );


            if ( json.uuid !== undefined ) material.uuid = json.uuid;

            if ( json.name !== undefined ) material.name = json.name;

            if ( json.color !== undefined && material.color !== undefined ) material.color.setHex( json.color );

            if ( json.roughness !== undefined ) material.roughness = json.roughness;

            if ( json.metalness !== undefined ) material.metalness = json.metalness;

            if ( json.sheen !== undefined ) material.sheen = json.sheen;

            if ( json.sheenColor !== undefined ) material.sheenColor = new Color().setHex( json.sheenColor );

            if ( json.sheenRoughness !== undefined ) material.sheenRoughness = json.sheenRoughness;

            if ( json.emissive !== undefined && material.emissive !== undefined ) material.emissive.setHex( json.emissive );

            if ( json.specular !== undefined && material.specular !== undefined ) material.specular.setHex( json.specular );

            if ( json.specularIntensity !== undefined ) material.specularIntensity = json.specularIntensity;

            if ( json.specularColor !== undefined && material.specularColor !== undefined ) material.specularColor.setHex( json.specularColor );

            if ( json.shininess !== undefined ) material.shininess = json.shininess;

            if ( json.clearcoat !== undefined ) material.clearcoat = json.clearcoat;

            if ( json.clearcoatRoughness !== undefined ) material.clearcoatRoughness = json.clearcoatRoughness;

            if ( json.iridescence !== undefined ) material.iridescence = json.iridescence;

            if ( json.iridescenceIOR !== undefined ) material.iridescenceIOR = json.iridescenceIOR;

            if ( json.iridescenceThicknessRange !== undefined ) material.iridescenceThicknessRange = json.iridescenceThicknessRange;

            if ( json.transmission !== undefined ) material.transmission = json.transmission;

            if ( json.thickness !== undefined ) material.thickness = json.thickness;

            if ( json.attenuationDistance !== undefined ) material.attenuationDistance = json.attenuationDistance;

            if ( json.attenuationColor !== undefined && material.attenuationColor !== undefined ) material.attenuationColor.setHex( json.attenuationColor );

            if ( json.anisotropy !== undefined ) material.anisotropy = json.anisotropy;

            if ( json.anisotropyRotation !== undefined ) material.anisotropyRotation = json.anisotropyRotation;

            if ( json.fog !== undefined ) material.fog = json.fog;

            if ( json.flatShading !== undefined ) material.flatShading = json.flatShading;

            if ( json.blending !== undefined ) material.blending = json.blending;

            if ( json.combine !== undefined ) material.combine = json.combine;

            if ( json.side !== undefined ) material.side = json.side;

            if ( json.shadowSide !== undefined ) material.shadowSide = json.shadowSide;

            if ( json.opacity !== undefined ) material.opacity = json.opacity;

            if ( json.transparent !== undefined ) material.transparent = json.transparent;

            if ( json.alphaTest !== undefined ) material.alphaTest = json.alphaTest;

            if ( json.alphaHash !== undefined ) material.alphaHash = json.alphaHash;

            if ( json.depthFunc !== undefined ) material.depthFunc = json.depthFunc;

            if ( json.depthTest !== undefined ) material.depthTest = json.depthTest;

            if ( json.depthWrite !== undefined ) material.depthWrite = json.depthWrite;

            if ( json.colorWrite !== undefined ) material.colorWrite = json.colorWrite;

            if ( json.blendSrc !== undefined ) material.blendSrc = json.blendSrc;

            if ( json.blendDst !== undefined ) material.blendDst = json.blendDst;

            if ( json.blendEquation !== undefined ) material.blendEquation = json.blendEquation;

            if ( json.blendSrcAlpha !== undefined ) material.blendSrcAlpha = json.blendSrcAlpha;

            if ( json.blendDstAlpha !== undefined ) material.blendDstAlpha = json.blendDstAlpha;

            if ( json.blendEquationAlpha !== undefined ) material.blendEquationAlpha = json.blendEquationAlpha;

            if ( json.blendColor !== undefined && material.blendColor !== undefined ) material.blendColor.setHex( json.blendColor );

            if ( json.blendAlpha !== undefined ) material.blendAlpha = json.blendAlpha;

            if ( json.stencilWriteMask !== undefined ) material.stencilWriteMask = json.stencilWriteMask;

            if ( json.stencilFunc !== undefined ) material.stencilFunc = json.stencilFunc;

            if ( json.stencilRef !== undefined ) material.stencilRef = json.stencilRef;

            if ( json.stencilFuncMask !== undefined ) material.stencilFuncMask = json.stencilFuncMask;

            if ( json.stencilFail !== undefined ) material.stencilFail = json.stencilFail;

            if ( json.stencilZFail !== undefined ) material.stencilZFail = json.stencilZFail;

            if ( json.stencilZPass !== undefined ) material.stencilZPass = json.stencilZPass;

            if ( json.stencilWrite !== undefined ) material.stencilWrite = json.stencilWrite;


            if ( json.wireframe !== undefined ) material.wireframe = json.wireframe;

            if ( json.wireframeLinewidth !== undefined ) material.wireframeLinewidth = json.wireframeLinewidth;

            if ( json.wireframeLinecap !== undefined ) material.wireframeLinecap = json.wireframeLinecap;

            if ( json.wireframeLinejoin !== undefined ) material.wireframeLinejoin = json.wireframeLinejoin;


            if ( json.rotation !== undefined ) material.rotation = json.rotation;


            if ( json.linewidth !== undefined ) material.linewidth = json.linewidth;

            if ( json.dashSize !== undefined ) material.dashSize = json.dashSize;

            if ( json.gapSize !== undefined ) material.gapSize = json.gapSize;

            if ( json.scale !== undefined ) material.scale = json.scale;


            if ( json.polygonOffset !== undefined ) material.polygonOffset = json.polygonOffset;

            if ( json.polygonOffsetFactor !== undefined ) material.polygonOffsetFactor = json.polygonOffsetFactor;

            if ( json.polygonOffsetUnits !== undefined ) material.polygonOffsetUnits = json.polygonOffsetUnits;


            if ( json.dithering !== undefined ) material.dithering = json.dithering;


            if ( json.alphaToCoverage !== undefined ) material.alphaToCoverage = json.alphaToCoverage;

            if ( json.premultipliedAlpha !== undefined ) material.premultipliedAlpha = json.premultipliedAlpha;

            if ( json.forceSinglePass !== undefined ) material.forceSinglePass = json.forceSinglePass;


            if ( json.visible !== undefined ) material.visible = json.visible;


            if ( json.toneMapped !== undefined ) material.toneMapped = json.toneMapped;


            if ( json.userData !== undefined ) material.userData = json.userData;


            if ( json.vertexColors !== undefined ) {


                if ( typeof json.vertexColors === 'number' ) {


                    material.vertexColors = ( json.vertexColors > 0 ) ? true : false;


                } else {


                    material.vertexColors = json.vertexColors;


                }


            }


            // Shader Material


            if ( json.uniforms !== undefined ) {


                for ( const name in json.uniforms ) {


                    const uniform = json.uniforms[ name ];


                    material.uniforms[ name ] = {};


                    switch ( uniform.type ) {


                        case 't':

                            material.uniforms[ name ].value = getTexture( uniform.value );

                            break;


                        case 'c':

                            material.uniforms[ name ].value = new Color().setHex( uniform.value );

                            break;


                        case 'v2':

                            material.uniforms[ name ].value = new Vector2().fromArray( uniform.value );

                            break;


                        case 'v3':

                            material.uniforms[ name ].value = new Vector3().fromArray( uniform.value );

                            break;


                        case 'v4':

                            material.uniforms[ name ].value = new Vector4().fromArray( uniform.value );

                            break;


                        case 'm3':

                            material.uniforms[ name ].value = new Matrix3().fromArray( uniform.value );

                            break;


                        case 'm4':

                            material.uniforms[ name ].value = new Matrix4().fromArray( uniform.value );

                            break;


                        default:

                            material.uniforms[ name ].value = uniform.value;


                    }


                }


            }


            if ( json.defines !== undefined ) material.defines = json.defines;

            if ( json.vertexShader !== undefined ) material.vertexShader = json.vertexShader;

            if ( json.fragmentShader !== undefined ) material.fragmentShader = json.fragmentShader;

            if ( json.glslVersion !== undefined ) material.glslVersion = json.glslVersion;


            if ( json.extensions !== undefined ) {


                for ( const key in json.extensions ) {


                    material.extensions[ key ] = json.extensions[ key ];


                }


            }


            if ( json.lights !== undefined ) material.lights = json.lights;

            if ( json.clipping !== undefined ) material.clipping = json.clipping;


            // for PointsMaterial


            if ( json.size !== undefined ) material.size = json.size;

            if ( json.sizeAttenuation !== undefined ) material.sizeAttenuation = json.sizeAttenuation;


            // maps


            if ( json.map !== undefined ) material.map = getTexture( json.map );

            if ( json.matcap !== undefined ) material.matcap = getTexture( json.matcap );


            if ( json.alphaMap !== undefined ) material.alphaMap = getTexture( json.alphaMap );


            if ( json.bumpMap !== undefined ) material.bumpMap = getTexture( json.bumpMap );

            if ( json.bumpScale !== undefined ) material.bumpScale = json.bumpScale;


            if ( json.normalMap !== undefined ) material.normalMap = getTexture( json.normalMap );

            if ( json.normalMapType !== undefined ) material.normalMapType = json.normalMapType;

            if ( json.normalScale !== undefined ) {


                let normalScale = json.normalScale;


                if ( Array.isArray( normalScale ) === false ) {


                    // Blender exporter used to export a scalar. See #7459


                    normalScale = [ normalScale, normalScale ];


                }


                material.normalScale = new Vector2().fromArray( normalScale );


            }


            if ( json.displacementMap !== undefined ) material.displacementMap = getTexture( json.displacementMap );

            if ( json.displacementScale !== undefined ) material.displacementScale = json.displacementScale;

            if ( json.displacementBias !== undefined ) material.displacementBias = json.displacementBias;


            if ( json.roughnessMap !== undefined ) material.roughnessMap = getTexture( json.roughnessMap );

            if ( json.metalnessMap !== undefined ) material.metalnessMap = getTexture( json.metalnessMap );


            if ( json.emissiveMap !== undefined ) material.emissiveMap = getTexture( json.emissiveMap );

            if ( json.emissiveIntensity !== undefined ) material.emissiveIntensity = json.emissiveIntensity;


            if ( json.specularMap !== undefined ) material.specularMap = getTexture( json.specularMap );

            if ( json.specularIntensityMap !== undefined ) material.specularIntensityMap = getTexture( json.specularIntensityMap );

            if ( json.specularColorMap !== undefined ) material.specularColorMap = getTexture( json.specularColorMap );


            if ( json.envMap !== undefined ) material.envMap = getTexture( json.envMap );

            if ( json.envMapIntensity !== undefined ) material.envMapIntensity = json.envMapIntensity;


            if ( json.reflectivity !== undefined ) material.reflectivity = json.reflectivity;

            if ( json.refractionRatio !== undefined ) material.refractionRatio = json.refractionRatio;


            if ( json.lightMap !== undefined ) material.lightMap = getTexture( json.lightMap );

            if ( json.lightMapIntensity !== undefined ) material.lightMapIntensity = json.lightMapIntensity;


            if ( json.aoMap !== undefined ) material.aoMap = getTexture( json.aoMap );

            if ( json.aoMapIntensity !== undefined ) material.aoMapIntensity = json.aoMapIntensity;


            if ( json.gradientMap !== undefined ) material.gradientMap = getTexture( json.gradientMap );


            if ( json.clearcoatMap !== undefined ) material.clearcoatMap = getTexture( json.clearcoatMap );

            if ( json.clearcoatRoughnessMap !== undefined ) material.clearcoatRoughnessMap = getTexture( json.clearcoatRoughnessMap );

            if ( json.clearcoatNormalMap !== undefined ) material.clearcoatNormalMap = getTexture( json.clearcoatNormalMap );

            if ( json.clearcoatNormalScale !== undefined ) material.clearcoatNormalScale = new Vector2().fromArray( json.clearcoatNormalScale );


            if ( json.iridescenceMap !== undefined ) material.iridescenceMap = getTexture( json.iridescenceMap );

            if ( json.iridescenceThicknessMap !== undefined ) material.iridescenceThicknessMap = getTexture( json.iridescenceThicknessMap );


            if ( json.transmissionMap !== undefined ) material.transmissionMap = getTexture( json.transmissionMap );

            if ( json.thicknessMap !== undefined ) material.thicknessMap = getTexture( json.thicknessMap );


            if ( json.anisotropyMap !== undefined ) material.anisotropyMap = getTexture( json.anisotropyMap );


            if ( json.sheenColorMap !== undefined ) material.sheenColorMap = getTexture( json.sheenColorMap );

            if ( json.sheenRoughnessMap !== undefined ) material.sheenRoughnessMap = getTexture( json.sheenRoughnessMap );


            return material;


        }


        setTextures( value ) {


            this.textures = value;

            return this;


        }


        static createMaterialFromType( type ) {


            const materialLib = {

                ShadowMaterial,

                SpriteMaterial,

                RawShaderMaterial,

                ShaderMaterial,

                PointsMaterial,

                MeshPhysicalMaterial,

                MeshStandardMaterial,

                MeshPhongMaterial,

                MeshToonMaterial,

                MeshNormalMaterial,

                MeshLambertMaterial,

                MeshDepthMaterial,

                MeshDistanceMaterial,

                MeshBasicMaterial,

                MeshMatcapMaterial,

                LineDashedMaterial,

                LineBasicMaterial,

                Material

            };


            return new materialLib[ type ]();


        }


    }


    class LoaderUtils {


        static decodeText( array ) {


            if ( typeof TextDecoder !== 'undefined' ) {


                return new TextDecoder().decode( array );


            }


            // Avoid the String.fromCharCode.apply(null, array) shortcut, which

            // throws a "maximum call stack size exceeded" error for large arrays.


            let s = '';


            for ( let i = 0, il = array.length; i < il; i ++ ) {


                // Implicitly assumes little-endian.

                s += String.fromCharCode( array[ i ] );


            }


            try {


                // merges multi-byte utf-8 characters.


                return decodeURIComponent( escape( s ) );


            } catch ( e ) { // see #16358


                return s;


            }


        }


        static extractUrlBase( url ) {


            const index = url.lastIndexOf( '/' );


            if ( index === - 1 ) return './';


            return url.slice( 0, index + 1 );


        }


        static resolveURL( url, path ) {


            // Invalid URL

            if ( typeof url !== 'string' || url === '' ) return '';


            // Host Relative URL

            if ( /^https?:\/\//i.test( path ) && /^\//.test( url ) ) {


                path = path.replace( /(^https?:\/\/[^\/]+).*/i, '$1' );


            }


            // Absolute URL http://,https://,//

            if ( /^(https?:)?\/\//i.test( url ) ) return url;


            // Data URI

            if ( /^data:.*,.*$/i.test( url ) ) return url;


            // Blob URL

            if ( /^blob:.*$/i.test( url ) ) return url;


            // Relative URL

            return path + url;


        }


    }


    class InstancedBufferGeometry extends BufferGeometry {


        constructor() {


            super();


            this.isInstancedBufferGeometry = true;


            this.type = 'InstancedBufferGeometry';

            this.instanceCount = Infinity;


        }


        copy( source ) {


            super.copy( source );


            this.instanceCount = source.instanceCount;


            return this;


        }


        toJSON() {


            const data = super.toJSON();


            data.instanceCount = this.instanceCount;


            data.isInstancedBufferGeometry = true;


            return data;


        }


    }


    class BufferGeometryLoader extends Loader {


        constructor( manager ) {


            super( manager );


        }


        load( url, onLoad, onProgress, onError ) {


            const scope = this;


            const loader = new FileLoader( scope.manager );

            loader.setPath( scope.path );

            loader.setRequestHeader( scope.requestHeader );

            loader.setWithCredentials( scope.withCredentials );

            loader.load( url, function ( text ) {


                try {


                    onLoad( scope.parse( JSON.parse( text ) ) );


                } catch ( e ) {


                    if ( onError ) {


                        onError( e );


                    } else {


                        console.error( e );


                    }


                    scope.manager.itemError( url );


                }


            }, onProgress, onError );


        }


        parse( json ) {


            const interleavedBufferMap = {};

            const arrayBufferMap = {};


            function getInterleavedBuffer( json, uuid ) {


                if ( interleavedBufferMap[ uuid ] !== undefined ) return interleavedBufferMap[ uuid ];


                const interleavedBuffers = json.interleavedBuffers;

                const interleavedBuffer = interleavedBuffers[ uuid ];


                const buffer = getArrayBuffer( json, interleavedBuffer.buffer );


                const array = getTypedArray( interleavedBuffer.type, buffer );

                const ib = new InterleavedBuffer( array, interleavedBuffer.stride );

                ib.uuid = interleavedBuffer.uuid;


                interleavedBufferMap[ uuid ] = ib;


                return ib;


            }


            function getArrayBuffer( json, uuid ) {


                if ( arrayBufferMap[ uuid ] !== undefined ) return arrayBufferMap[ uuid ];


                const arrayBuffers = json.arrayBuffers;

                const arrayBuffer = arrayBuffers[ uuid ];


                const ab = new Uint32Array( arrayBuffer ).buffer;


                arrayBufferMap[ uuid ] = ab;


                return ab;


            }


            const geometry = json.isInstancedBufferGeometry ? new InstancedBufferGeometry() : new BufferGeometry();


            const index = json.data.index;


            if ( index !== undefined ) {


                const typedArray = getTypedArray( index.type, index.array );

                geometry.setIndex( new BufferAttribute( typedArray, 1 ) );


            }


            const attributes = json.data.attributes;


            for ( const key in attributes ) {


                const attribute = attributes[ key ];

                let bufferAttribute;


                if ( attribute.isInterleavedBufferAttribute ) {


                    const interleavedBuffer = getInterleavedBuffer( json.data, attribute.data );

                    bufferAttribute = new InterleavedBufferAttribute( interleavedBuffer, attribute.itemSize, attribute.offset, attribute.normalized );


                } else {


                    const typedArray = getTypedArray( attribute.type, attribute.array );

                    const bufferAttributeConstr = attribute.isInstancedBufferAttribute ? InstancedBufferAttribute : BufferAttribute;

                    bufferAttribute = new bufferAttributeConstr( typedArray, attribute.itemSize, attribute.normalized );


                }


                if ( attribute.name !== undefined ) bufferAttribute.name = attribute.name;

                if ( attribute.usage !== undefined ) bufferAttribute.setUsage( attribute.usage );


                geometry.setAttribute( key, bufferAttribute );


            }


            const morphAttributes = json.data.morphAttributes;


            if ( morphAttributes ) {


                for ( const key in morphAttributes ) {


                    const attributeArray = morphAttributes[ key ];


                    const array = [];


                    for ( let i = 0, il = attributeArray.length; i < il; i ++ ) {


                        const attribute = attributeArray[ i ];

                        let bufferAttribute;


                        if ( attribute.isInterleavedBufferAttribute ) {


                            const interleavedBuffer = getInterleavedBuffer( json.data, attribute.data );

                            bufferAttribute = new InterleavedBufferAttribute( interleavedBuffer, attribute.itemSize, attribute.offset, attribute.normalized );


                        } else {


                            const typedArray = getTypedArray( attribute.type, attribute.array );

                            bufferAttribute = new BufferAttribute( typedArray, attribute.itemSize, attribute.normalized );


                        }


                        if ( attribute.name !== undefined ) bufferAttribute.name = attribute.name;

                        array.push( bufferAttribute );


                    }


                    geometry.morphAttributes[ key ] = array;


                }


            }


            const morphTargetsRelative = json.data.morphTargetsRelative;


            if ( morphTargetsRelative ) {


                geometry.morphTargetsRelative = true;


            }


            const groups = json.data.groups || json.data.drawcalls || json.data.offsets;


            if ( groups !== undefined ) {


                for ( let i = 0, n = groups.length; i !== n; ++ i ) {


                    const group = groups[ i ];


                    geometry.addGroup( group.start, group.count, group.materialIndex );


                }


            }


            const boundingSphere = json.data.boundingSphere;


            if ( boundingSphere !== undefined ) {


                const center = new Vector3();


                if ( boundingSphere.center !== undefined ) {


                    center.fromArray( boundingSphere.center );


                }


                geometry.boundingSphere = new Sphere( center, boundingSphere.radius );


            }


            if ( json.name ) geometry.name = json.name;

            if ( json.userData ) geometry.userData = json.userData;


            return geometry;


        }


    }


    class ObjectLoader extends Loader {


        constructor( manager ) {


            super( manager );


        }


        load( url, onLoad, onProgress, onError ) {


            const scope = this;


            const path = ( this.path === '' ) ? LoaderUtils.extractUrlBase( url ) : this.path;

            this.resourcePath = this.resourcePath || path;


            const loader = new FileLoader( this.manager );

            loader.setPath( this.path );

            loader.setRequestHeader( this.requestHeader );

            loader.setWithCredentials( this.withCredentials );

            loader.load( url, function ( text ) {


                let json = null;


                try {


                    json = JSON.parse( text );


                } catch ( error ) {


                    if ( onError !== undefined ) onError( error );


                    console.error( 'THREE:ObjectLoader: Can\'t parse ' + url + '.', error.message );


                    return;


                }


                const metadata = json.metadata;


                if ( metadata === undefined || metadata.type === undefined || metadata.type.toLowerCase() === 'geometry' ) {


                    if ( onError !== undefined ) onError( new Error( 'THREE.ObjectLoader: Can\'t load ' + url ) );


                    console.error( 'THREE.ObjectLoader: Can\'t load ' + url );

                    return;


                }


                scope.parse( json, onLoad );


            }, onProgress, onError );


        }


        async loadAsync( url, onProgress ) {


            const scope = this;


            const path = ( this.path === '' ) ? LoaderUtils.extractUrlBase( url ) : this.path;

            this.resourcePath = this.resourcePath || path;


            const loader = new FileLoader( this.manager );

            loader.setPath( this.path );

            loader.setRequestHeader( this.requestHeader );

            loader.setWithCredentials( this.withCredentials );


            const text = await loader.loadAsync( url, onProgress );


            const json = JSON.parse( text );


            const metadata = json.metadata;


            if ( metadata === undefined || metadata.type === undefined || metadata.type.toLowerCase() === 'geometry' ) {


                throw new Error( 'THREE.ObjectLoader: Can\'t load ' + url );


            }


            return await scope.parseAsync( json );


        }


        parse( json, onLoad ) {


            const animations = this.parseAnimations( json.animations );

            const shapes = this.parseShapes( json.shapes );

            const geometries = this.parseGeometries( json.geometries, shapes );


            const images = this.parseImages( json.images, function () {


                if ( onLoad !== undefined ) onLoad( object );


            } );


            const textures = this.parseTextures( json.textures, images );

            const materials = this.parseMaterials( json.materials, textures );


            const object = this.parseObject( json.object, geometries, materials, textures, animations );

            const skeletons = this.parseSkeletons( json.skeletons, object );


            this.bindSkeletons( object, skeletons );


            //


            if ( onLoad !== undefined ) {


                let hasImages = false;


                for ( const uuid in images ) {


                    if ( images[ uuid ].data instanceof HTMLImageElement ) {


                        hasImages = true;

                        break;


                    }


                }


                if ( hasImages === false ) onLoad( object );


            }


            return object;


        }


        async parseAsync( json ) {


            const animations = this.parseAnimations( json.animations );

            const shapes = this.parseShapes( json.shapes );

            const geometries = this.parseGeometries( json.geometries, shapes );


            const images = await this.parseImagesAsync( json.images );


            const textures = this.parseTextures( json.textures, images );

            const materials = this.parseMaterials( json.materials, textures );


            const object = this.parseObject( json.object, geometries, materials, textures, animations );

            const skeletons = this.parseSkeletons( json.skeletons, object );


            this.bindSkeletons( object, skeletons );


            return object;


        }


        parseShapes( json ) {


            const shapes = {};


            if ( json !== undefined ) {


                for ( let i = 0, l = json.length; i < l; i ++ ) {


                    const shape = new Shape().fromJSON( json[ i ] );


                    shapes[ shape.uuid ] = shape;


                }


            }


            return shapes;


        }


        parseSkeletons( json, object ) {


            const skeletons = {};

            const bones = {};


            // generate bone lookup table


            object.traverse( function ( child ) {


                if ( child.isBone ) bones[ child.uuid ] = child;


            } );


            // create skeletons


            if ( json !== undefined ) {


                for ( let i = 0, l = json.length; i < l; i ++ ) {


                    const skeleton = new Skeleton().fromJSON( json[ i ], bones );


                    skeletons[ skeleton.uuid ] = skeleton;


                }


            }


            return skeletons;


        }


        parseGeometries( json, shapes ) {


            const geometries = {};


            if ( json !== undefined ) {


                const bufferGeometryLoader = new BufferGeometryLoader();


                for ( let i = 0, l = json.length; i < l; i ++ ) {


                    let geometry;

                    const data = json[ i ];


                    switch ( data.type ) {


                        case 'BufferGeometry':

                        case 'InstancedBufferGeometry':


                            geometry = bufferGeometryLoader.parse( data );

                            break;


                        default:


                            if ( data.type in Geometries ) {


                                geometry = Geometries[ data.type ].fromJSON( data, shapes );


                            } else {


                                console.warn( `THREE.ObjectLoader: Unsupported geometry type "${ data.type }"` );


                            }


                    }


                    geometry.uuid = data.uuid;


                    if ( data.name !== undefined ) geometry.name = data.name;

                    if ( data.userData !== undefined ) geometry.userData = data.userData;


                    geometries[ data.uuid ] = geometry;


                }


            }


            return geometries;


        }


        parseMaterials( json, textures ) {


            const cache = {}; // MultiMaterial

            const materials = {};


            if ( json !== undefined ) {


                const loader = new MaterialLoader();

                loader.setTextures( textures );


                for ( let i = 0, l = json.length; i < l; i ++ ) {


                    const data = json[ i ];


                    if ( cache[ data.uuid ] === undefined ) {


                        cache[ data.uuid ] = loader.parse( data );


                    }


                    materials[ data.uuid ] = cache[ data.uuid ];


                }


            }


            return materials;


        }


        parseAnimations( json ) {


            const animations = {};


            if ( json !== undefined ) {


                for ( let i = 0; i < json.length; i ++ ) {


                    const data = json[ i ];


                    const clip = AnimationClip.parse( data );


                    animations[ clip.uuid ] = clip;


                }


            }


            return animations;


        }


        parseImages( json, onLoad ) {


            const scope = this;

            const images = {};


            let loader;


            function loadImage( url ) {


                scope.manager.itemStart( url );


                return loader.load( url, function () {


                    scope.manager.itemEnd( url );


                }, undefined, function () {


                    scope.manager.itemError( url );

                    scope.manager.itemEnd( url );


                } );


            }


            function deserializeImage( image ) {


                if ( typeof image === 'string' ) {


                    const url = image;


                    const path = /^(\/\/)|([a-z]+:(\/\/)?)/i.test( url ) ? url : scope.resourcePath + url;


                    return loadImage( path );


                } else {


                    if ( image.data ) {


                        return {

                            data: getTypedArray( image.type, image.data ),

                            width: image.width,

                            height: image.height

                        };


                    } else {


                        return null;


                    }


                }


            }


            if ( json !== undefined && json.length > 0 ) {


                const manager = new LoadingManager( onLoad );


                loader = new ImageLoader( manager );

                loader.setCrossOrigin( this.crossOrigin );


                for ( let i = 0, il = json.length; i < il; i ++ ) {


                    const image = json[ i ];

                    const url = image.url;


                    if ( Array.isArray( url ) ) {


                        // load array of images e.g CubeTexture


                        const imageArray = [];


                        for ( let j = 0, jl = url.length; j < jl; j ++ ) {


                            const currentUrl = url[ j ];


                            const deserializedImage = deserializeImage( currentUrl );


                            if ( deserializedImage !== null ) {


                                if ( deserializedImage instanceof HTMLImageElement ) {


                                    imageArray.push( deserializedImage );


                                } else {


                                    // special case: handle array of data textures for cube textures


                                    imageArray.push( new DataTexture( deserializedImage.data, deserializedImage.width, deserializedImage.height ) );


                                }


                            }


                        }


                        images[ image.uuid ] = new Source( imageArray );


                    } else {


                        // load single image


                        const deserializedImage = deserializeImage( image.url );

                        images[ image.uuid ] = new Source( deserializedImage );


                    }


                }


            }


            return images;


        }


        async parseImagesAsync( json ) {


            const scope = this;

            const images = {};


            let loader;


            async function deserializeImage( image ) {


                if ( typeof image === 'string' ) {


                    const url = image;


                    const path = /^(\/\/)|([a-z]+:(\/\/)?)/i.test( url ) ? url : scope.resourcePath + url;


                    return await loader.loadAsync( path );


                } else {


                    if ( image.data ) {


                        return {

                            data: getTypedArray( image.type, image.data ),

                            width: image.width,

                            height: image.height

                        };


                    } else {


                        return null;


                    }


                }


            }


            if ( json !== undefined && json.length > 0 ) {


                loader = new ImageLoader( this.manager );

                loader.setCrossOrigin( this.crossOrigin );


                for ( let i = 0, il = json.length; i < il; i ++ ) {


                    const image = json[ i ];

                    const url = image.url;


                    if ( Array.isArray( url ) ) {


                        // load array of images e.g CubeTexture


                        const imageArray = [];


                        for ( let j = 0, jl = url.length; j < jl; j ++ ) {


                            const currentUrl = url[ j ];


                            const deserializedImage = await deserializeImage( currentUrl );


                            if ( deserializedImage !== null ) {


                                if ( deserializedImage instanceof HTMLImageElement ) {


                                    imageArray.push( deserializedImage );


                                } else {


                                    // special case: handle array of data textures for cube textures


                                    imageArray.push( new DataTexture( deserializedImage.data, deserializedImage.width, deserializedImage.height ) );


                                }


                            }


                        }


                        images[ image.uuid ] = new Source( imageArray );


                    } else {


                        // load single image


                        const deserializedImage = await deserializeImage( image.url );

                        images[ image.uuid ] = new Source( deserializedImage );


                    }


                }


            }


            return images;


        }


        parseTextures( json, images ) {


            function parseConstant( value, type ) {


                if ( typeof value === 'number' ) return value;


                console.warn( 'THREE.ObjectLoader.parseTexture: Constant should be in numeric form.', value );


                return type[ value ];


            }


            const textures = {};


            if ( json !== undefined ) {


                for ( let i = 0, l = json.length; i < l; i ++ ) {


                    const data = json[ i ];


                    if ( data.image === undefined ) {


                        console.warn( 'THREE.ObjectLoader: No "image" specified for', data.uuid );


                    }


                    if ( images[ data.image ] === undefined ) {


                        console.warn( 'THREE.ObjectLoader: Undefined image', data.image );


                    }


                    const source = images[ data.image ];

                    const image = source.data;


                    let texture;


                    if ( Array.isArray( image ) ) {


                        texture = new CubeTexture();


                        if ( image.length === 6 ) texture.needsUpdate = true;


                    } else {


                        if ( image && image.data ) {


                            texture = new DataTexture();


                        } else {


                            texture = new Texture();


                        }


                        if ( image ) texture.needsUpdate = true; // textures can have undefined image data


                    }


                    texture.source = source;


                    texture.uuid = data.uuid;


                    if ( data.name !== undefined ) texture.name = data.name;


                    if ( data.mapping !== undefined ) texture.mapping = parseConstant( data.mapping, TEXTURE_MAPPING );

                    if ( data.channel !== undefined ) texture.channel = data.channel;


                    if ( data.offset !== undefined ) texture.offset.fromArray( data.offset );

                    if ( data.repeat !== undefined ) texture.repeat.fromArray( data.repeat );

                    if ( data.center !== undefined ) texture.center.fromArray( data.center );

                    if ( data.rotation !== undefined ) texture.rotation = data.rotation;


                    if ( data.wrap !== undefined ) {


                        texture.wrapS = parseConstant( data.wrap[ 0 ], TEXTURE_WRAPPING );

                        texture.wrapT = parseConstant( data.wrap[ 1 ], TEXTURE_WRAPPING );


                    }


                    if ( data.format !== undefined ) texture.format = data.format;

                    if ( data.internalFormat !== undefined ) texture.internalFormat = data.internalFormat;

                    if ( data.type !== undefined ) texture.type = data.type;

                    if ( data.colorSpace !== undefined ) texture.colorSpace = data.colorSpace;

                    if ( data.encoding !== undefined ) texture.encoding = data.encoding; // @deprecated, r152


                    if ( data.minFilter !== undefined ) texture.minFilter = parseConstant( data.minFilter, TEXTURE_FILTER );

                    if ( data.magFilter !== undefined ) texture.magFilter = parseConstant( data.magFilter, TEXTURE_FILTER );

                    if ( data.anisotropy !== undefined ) texture.anisotropy = data.anisotropy;


                    if ( data.flipY !== undefined ) texture.flipY = data.flipY;


                    if ( data.generateMipmaps !== undefined ) texture.generateMipmaps = data.generateMipmaps;

                    if ( data.premultiplyAlpha !== undefined ) texture.premultiplyAlpha = data.premultiplyAlpha;

                    if ( data.unpackAlignment !== undefined ) texture.unpackAlignment = data.unpackAlignment;

                    if ( data.compareFunction !== undefined ) texture.compareFunction = data.compareFunction;


                    if ( data.userData !== undefined ) texture.userData = data.userData;


                    textures[ data.uuid ] = texture;


                }


            }


            return textures;


        }


        parseObject( data, geometries, materials, textures, animations ) {


            let object;


            function getGeometry( name ) {


                if ( geometries[ name ] === undefined ) {


                    console.warn( 'THREE.ObjectLoader: Undefined geometry', name );


                }


                return geometries[ name ];


            }


            function getMaterial( name ) {


                if ( name === undefined ) return undefined;


                if ( Array.isArray( name ) ) {


                    const array = [];


                    for ( let i = 0, l = name.length; i < l; i ++ ) {


                        const uuid = name[ i ];


                        if ( materials[ uuid ] === undefined ) {


                            console.warn( 'THREE.ObjectLoader: Undefined material', uuid );


                        }


                        array.push( materials[ uuid ] );


                    }


                    return array;


                }


                if ( materials[ name ] === undefined ) {


                    console.warn( 'THREE.ObjectLoader: Undefined material', name );


                }


                return materials[ name ];


            }


            function getTexture( uuid ) {


                if ( textures[ uuid ] === undefined ) {


                    console.warn( 'THREE.ObjectLoader: Undefined texture', uuid );


                }


                return textures[ uuid ];


            }


            let geometry, material;


            switch ( data.type ) {


                case 'Scene':


                    object = new Scene();


                    if ( data.background !== undefined ) {


                        if ( Number.isInteger( data.background ) ) {


                            object.background = new Color( data.background );


                        } else {


                            object.background = getTexture( data.background );


                        }


                    }


                    if ( data.environment !== undefined ) {


                        object.environment = getTexture( data.environment );


                    }


                    if ( data.fog !== undefined ) {


                        if ( data.fog.type === 'Fog' ) {


                            object.fog = new Fog( data.fog.color, data.fog.near, data.fog.far );


                        } else if ( data.fog.type === 'FogExp2' ) {


                            object.fog = new FogExp2( data.fog.color, data.fog.density );


                        }


                        if ( data.fog.name !== '' ) {


                            object.fog.name = data.fog.name;


                        }


                    }


                    if ( data.backgroundBlurriness !== undefined ) object.backgroundBlurriness = data.backgroundBlurriness;

                    if ( data.backgroundIntensity !== undefined ) object.backgroundIntensity = data.backgroundIntensity;


                    break;


                case 'PerspectiveCamera':


                    object = new PerspectiveCamera( data.fov, data.aspect, data.near, data.far );


                    if ( data.focus !== undefined ) object.focus = data.focus;

                    if ( data.zoom !== undefined ) object.zoom = data.zoom;

                    if ( data.filmGauge !== undefined ) object.filmGauge = data.filmGauge;

                    if ( data.filmOffset !== undefined ) object.filmOffset = data.filmOffset;

                    if ( data.view !== undefined ) object.view = Object.assign( {}, data.view );


                    break;


                case 'OrthographicCamera':


                    object = new OrthographicCamera( data.left, data.right, data.top, data.bottom, data.near, data.far );


                    if ( data.zoom !== undefined ) object.zoom = data.zoom;

                    if ( data.view !== undefined ) object.view = Object.assign( {}, data.view );


                    break;


                case 'AmbientLight':


                    object = new AmbientLight( data.color, data.intensity );


                    break;


                case 'DirectionalLight':


                    object = new DirectionalLight( data.color, data.intensity );


                    break;


                case 'PointLight':


                    object = new PointLight( data.color, data.intensity, data.distance, data.decay );


                    break;


                case 'RectAreaLight':


                    object = new RectAreaLight( data.color, data.intensity, data.width, data.height );


                    break;


                case 'SpotLight':


                    object = new SpotLight( data.color, data.intensity, data.distance, data.angle, data.penumbra, data.decay );


                    break;


                case 'HemisphereLight':


                    object = new HemisphereLight( data.color, data.groundColor, data.intensity );


                    break;


                case 'LightProbe':


                    object = new LightProbe().fromJSON( data );


                    break;


                case 'SkinnedMesh':


                    geometry = getGeometry( data.geometry );

                    material = getMaterial( data.material );


                    object = new SkinnedMesh( geometry, material );


                    if ( data.bindMode !== undefined ) object.bindMode = data.bindMode;

                    if ( data.bindMatrix !== undefined ) object.bindMatrix.fromArray( data.bindMatrix );

                    if ( data.skeleton !== undefined ) object.skeleton = data.skeleton;


                    break;


                case 'Mesh':


                    geometry = getGeometry( data.geometry );

                    material = getMaterial( data.material );


                    object = new Mesh( geometry, material );


                    break;


                case 'InstancedMesh':


                    geometry = getGeometry( data.geometry );

                    material = getMaterial( data.material );

                    const count = data.count;

                    const instanceMatrix = data.instanceMatrix;

                    const instanceColor = data.instanceColor;


                    object = new InstancedMesh( geometry, material, count );

                    object.instanceMatrix = new InstancedBufferAttribute( new Float32Array( instanceMatrix.array ), 16 );

                    if ( instanceColor !== undefined ) object.instanceColor = new InstancedBufferAttribute( new Float32Array( instanceColor.array ), instanceColor.itemSize );


                    break;


                case 'BatchedMesh':


                    geometry = getGeometry( data.geometry );

                    material = getMaterial( data.material );


                    object = new BatchedMesh( data.maxGeometryCount, data.maxVertexCount, data.maxIndexCount, material );

                    object.geometry = geometry;

                    object.perObjectFrustumCulled = data.perObjectFrustumCulled;

                    object.sortObjects = data.sortObjects;


                    object._drawRanges = data.drawRanges;

                    object._reservedRanges = data.reservedRanges;


                    object._visibility = data.visibility;

                    object._active = data.active;

                    object._bounds = data.bounds.map( bound => {


                        const box = new Box3();

                        box.min.fromArray( bound.boxMin );

                        box.max.fromArray( bound.boxMax );


                        const sphere = new Sphere();

                        sphere.radius = bound.sphereRadius;

                        sphere.center.fromArray( bound.sphereCenter );


                        return {

                            boxInitialized: bound.boxInitialized,

                            box: box,


                            sphereInitialized: bound.sphereInitialized,

                            sphere: sphere

                        };


                    } );


                    object._maxGeometryCount = data.maxGeometryCount;

                    object._maxVertexCount = data.maxVertexCount;

                    object._maxIndexCount = data.maxIndexCount;


                    object._geometryInitialized = data.geometryInitialized;

                    object._geometryCount = data.geometryCount;


                    object._matricesTexture = getTexture( data.matricesTexture.uuid );


                    break;


                case 'LOD':


                    object = new LOD();


                    break;


                case 'Line':


                    object = new Line( getGeometry( data.geometry ), getMaterial( data.material ) );


                    break;


                case 'LineLoop':


                    object = new LineLoop( getGeometry( data.geometry ), getMaterial( data.material ) );


                    break;


                case 'LineSegments':


                    object = new LineSegments( getGeometry( data.geometry ), getMaterial( data.material ) );


                    break;


                case 'PointCloud':

                case 'Points':


                    object = new Points( getGeometry( data.geometry ), getMaterial( data.material ) );


                    break;


                case 'Sprite':


                    object = new Sprite( getMaterial( data.material ) );


                    break;


                case 'Group':


                    object = new Group();


                    break;


                case 'Bone':


                    object = new Bone();


                    break;


                default:


                    object = new Object3D();


            }


            object.uuid = data.uuid;


            if ( data.name !== undefined ) object.name = data.name;


            if ( data.matrix !== undefined ) {


                object.matrix.fromArray( data.matrix );


                if ( data.matrixAutoUpdate !== undefined ) object.matrixAutoUpdate = data.matrixAutoUpdate;

                if ( object.matrixAutoUpdate ) object.matrix.decompose( object.position, object.quaternion, object.scale );


            } else {


                if ( data.position !== undefined ) object.position.fromArray( data.position );

                if ( data.rotation !== undefined ) object.rotation.fromArray( data.rotation );

                if ( data.quaternion !== undefined ) object.quaternion.fromArray( data.quaternion );

                if ( data.scale !== undefined ) object.scale.fromArray( data.scale );


            }


            if ( data.up !== undefined ) object.up.fromArray( data.up );


            if ( data.castShadow !== undefined ) object.castShadow = data.castShadow;

            if ( data.receiveShadow !== undefined ) object.receiveShadow = data.receiveShadow;


            if ( data.shadow ) {


                if ( data.shadow.bias !== undefined ) object.shadow.bias = data.shadow.bias;

                if ( data.shadow.normalBias !== undefined ) object.shadow.normalBias = data.shadow.normalBias;

                if ( data.shadow.radius !== undefined ) object.shadow.radius = data.shadow.radius;

                if ( data.shadow.mapSize !== undefined ) object.shadow.mapSize.fromArray( data.shadow.mapSize );

                if ( data.shadow.camera !== undefined ) object.shadow.camera = this.parseObject( data.shadow.camera );


            }


            if ( data.visible !== undefined ) object.visible = data.visible;

            if ( data.frustumCulled !== undefined ) object.frustumCulled = data.frustumCulled;

            if ( data.renderOrder !== undefined ) object.renderOrder = data.renderOrder;

            if ( data.userData !== undefined ) object.userData = data.userData;

            if ( data.layers !== undefined ) object.layers.mask = data.layers;


            if ( data.children !== undefined ) {


                const children = data.children;


                for ( let i = 0; i < children.length; i ++ ) {


                    object.add( this.parseObject( children[ i ], geometries, materials, textures, animations ) );


                }


            }


            if ( data.animations !== undefined ) {


                const objectAnimations = data.animations;


                for ( let i = 0; i < objectAnimations.length; i ++ ) {


                    const uuid = objectAnimations[ i ];


                    object.animations.push( animations[ uuid ] );


                }


            }


            if ( data.type === 'LOD' ) {


                if ( data.autoUpdate !== undefined ) object.autoUpdate = data.autoUpdate;


                const levels = data.levels;


                for ( let l = 0; l < levels.length; l ++ ) {


                    const level = levels[ l ];

                    const child = object.getObjectByProperty( 'uuid', level.object );


                    if ( child !== undefined ) {


                        object.addLevel( child, level.distance, level.hysteresis );


                    }


                }


            }


            return object;


        }


        bindSkeletons( object, skeletons ) {


            if ( Object.keys( skeletons ).length === 0 ) return;


            object.traverse( function ( child ) {


                if ( child.isSkinnedMesh === true && child.skeleton !== undefined ) {


                    const skeleton = skeletons[ child.skeleton ];


                    if ( skeleton === undefined ) {


                        console.warn( 'THREE.ObjectLoader: No skeleton found with UUID:', child.skeleton );


                    } else {


                        child.bind( skeleton, child.bindMatrix );


                    }


                }


            } );


        }


    }


    const TEXTURE_MAPPING = {

        UVMapping: UVMapping,

        CubeReflectionMapping: CubeReflectionMapping,

        CubeRefractionMapping: CubeRefractionMapping,

        EquirectangularReflectionMapping: EquirectangularReflectionMapping,

        EquirectangularRefractionMapping: EquirectangularRefractionMapping,

        CubeUVReflectionMapping: CubeUVReflectionMapping

    };


    const TEXTURE_WRAPPING = {

        RepeatWrapping: RepeatWrapping,

        ClampToEdgeWrapping: ClampToEdgeWrapping,

        MirroredRepeatWrapping: MirroredRepeatWrapping

    };


    const TEXTURE_FILTER = {

        NearestFilter: NearestFilter,

        NearestMipmapNearestFilter: NearestMipmapNearestFilter,

        NearestMipmapLinearFilter: NearestMipmapLinearFilter,

        LinearFilter: LinearFilter,

        LinearMipmapNearestFilter: LinearMipmapNearestFilter,

        LinearMipmapLinearFilter: LinearMipmapLinearFilter

    };


    class ImageBitmapLoader extends Loader {


        constructor( manager ) {


            super( manager );


            this.isImageBitmapLoader = true;


            if ( typeof createImageBitmap === 'undefined' ) {


                console.warn( 'THREE.ImageBitmapLoader: createImageBitmap() not supported.' );


            }


            if ( typeof fetch === 'undefined' ) {


                console.warn( 'THREE.ImageBitmapLoader: fetch() not supported.' );


            }


            this.options = { premultiplyAlpha: 'none' };


        }


        setOptions( options ) {


            this.options = options;


            return this;


        }


        load( url, onLoad, onProgress, onError ) {


            if ( url === undefined ) url = '';


            if ( this.path !== undefined ) url = this.path + url;


            url = this.manager.resolveURL( url );


            const scope = this;


            const cached = Cache.get( url );


            if ( cached !== undefined ) {


                scope.manager.itemStart( url );


                // If cached is a promise, wait for it to resolve

                if ( cached.then ) {


                    cached.then( imageBitmap => {


                        if ( onLoad ) onLoad( imageBitmap );


                        scope.manager.itemEnd( url );


                    } ).catch( e => {


                        if ( onError ) onError( e );


                    } );

                    return;


                }


                // If cached is not a promise (i.e., it's already an imageBitmap)

                setTimeout( function () {


                    if ( onLoad ) onLoad( cached );


                    scope.manager.itemEnd( url );


                }, 0 );


                return cached;


            }


            const fetchOptions = {};

            fetchOptions.credentials = ( this.crossOrigin === 'anonymous' ) ? 'same-origin' : 'include';

            fetchOptions.headers = this.requestHeader;


            const promise = fetch( url, fetchOptions ).then( function ( res ) {


                return res.blob();


            } ).then( function ( blob ) {


                return createImageBitmap( blob, Object.assign( scope.options, { colorSpaceConversion: 'none' } ) );


            } ).then( function ( imageBitmap ) {


                Cache.add( url, imageBitmap );


                if ( onLoad ) onLoad( imageBitmap );


                scope.manager.itemEnd( url );


                return imageBitmap;


            } ).catch( function ( e ) {


                if ( onError ) onError( e );


                Cache.remove( url );


                scope.manager.itemError( url );

                scope.manager.itemEnd( url );


            } );


            Cache.add( url, promise );

            scope.manager.itemStart( url );


        }


    }


    let _context;


    class AudioContext {


        static getContext() {


            if ( _context === undefined ) {


                _context = new ( window.AudioContext || window.webkitAudioContext )();


            }


            return _context;


        }


        static setContext( value ) {


            _context = value;


        }


    }


    class AudioLoader extends Loader {


        constructor( manager ) {


            super( manager );


        }


        load( url, onLoad, onProgress, onError ) {


            const scope = this;


            const loader = new FileLoader( this.manager );

            loader.setResponseType( 'arraybuffer' );

            loader.setPath( this.path );

            loader.setRequestHeader( this.requestHeader );

            loader.setWithCredentials( this.withCredentials );

            loader.load( url, function ( buffer ) {


                try {


                    // Create a copy of the buffer. The `decodeAudioData` method

                    // detaches the buffer when complete, preventing reuse.

                    const bufferCopy = buffer.slice( 0 );


                    const context = AudioContext.getContext();

                    context.decodeAudioData( bufferCopy, function ( audioBuffer ) {


                        onLoad( audioBuffer );


                    } ).catch( handleError );


                } catch ( e ) {


                    handleError( e );


                }


            }, onProgress, onError );


            function handleError( e ) {


                if ( onError ) {


                    onError( e );


                } else {


                    console.error( e );


                }


                scope.manager.itemError( url );


            }


        }


    }


    const _eyeRight = /*@__PURE__*/ new Matrix4();

    const _eyeLeft = /*@__PURE__*/ new Matrix4();

    const _projectionMatrix = /*@__PURE__*/ new Matrix4();


    class StereoCamera {


        constructor() {


            this.type = 'StereoCamera';


            this.aspect = 1;


            this.eyeSep = 0.064;


            this.cameraL = new PerspectiveCamera();

            this.cameraL.layers.enable( 1 );

            this.cameraL.matrixAutoUpdate = false;


            this.cameraR = new PerspectiveCamera();

            this.cameraR.layers.enable( 2 );

            this.cameraR.matrixAutoUpdate = false;


            this._cache = {

                focus: null,

                fov: null,

                aspect: null,

                near: null,

                far: null,

                zoom: null,

                eyeSep: null

            };


        }


        update( camera ) {


            const cache = this._cache;


            const needsUpdate = cache.focus !== camera.focus || cache.fov !== camera.fov ||

                cache.aspect !== camera.aspect * this.aspect || cache.near !== camera.near ||

                cache.far !== camera.far || cache.zoom !== camera.zoom || cache.eyeSep !== this.eyeSep;


            if ( needsUpdate ) {


                cache.focus = camera.focus;

                cache.fov = camera.fov;

                cache.aspect = camera.aspect * this.aspect;

                cache.near = camera.near;

                cache.far = camera.far;

                cache.zoom = camera.zoom;

                cache.eyeSep = this.eyeSep;


                // Off-axis stereoscopic effect based on

                // http://paulbourke.net/stereographics/stereorender/


                _projectionMatrix.copy( camera.projectionMatrix );

                const eyeSepHalf = cache.eyeSep / 2;

                const eyeSepOnProjection = eyeSepHalf * cache.near / cache.focus;

                const ymax = ( cache.near * Math.tan( DEG2RAD * cache.fov * 0.5 ) ) / cache.zoom;

                let xmin, xmax;


                // translate xOffset


                _eyeLeft.elements[ 12 ] = - eyeSepHalf;

                _eyeRight.elements[ 12 ] = eyeSepHalf;


                // for left eye


                xmin = - ymax * cache.aspect + eyeSepOnProjection;

                xmax = ymax * cache.aspect + eyeSepOnProjection;


                _projectionMatrix.elements[ 0 ] = 2 * cache.near / ( xmax - xmin );

                _projectionMatrix.elements[ 8 ] = ( xmax + xmin ) / ( xmax - xmin );


                this.cameraL.projectionMatrix.copy( _projectionMatrix );


                // for right eye


                xmin = - ymax * cache.aspect - eyeSepOnProjection;

                xmax = ymax * cache.aspect - eyeSepOnProjection;


                _projectionMatrix.elements[ 0 ] = 2 * cache.near / ( xmax - xmin );

                _projectionMatrix.elements[ 8 ] = ( xmax + xmin ) / ( xmax - xmin );


                this.cameraR.projectionMatrix.copy( _projectionMatrix );


            }


            this.cameraL.matrixWorld.copy( camera.matrixWorld ).multiply( _eyeLeft );

            this.cameraR.matrixWorld.copy( camera.matrixWorld ).multiply( _eyeRight );


        }


    }


    class Clock {


        constructor( autoStart = true ) {


            this.autoStart = autoStart;


            this.startTime = 0;

            this.oldTime = 0;

            this.elapsedTime = 0;


            this.running = false;


        }


        start() {


            this.startTime = now();


            this.oldTime = this.startTime;

            this.elapsedTime = 0;

            this.running = true;


        }


        stop() {


            this.getElapsedTime();

            this.running = false;

            this.autoStart = false;


        }


        getElapsedTime() {


            this.getDelta();

            return this.elapsedTime;


        }


        getDelta() {


            let diff = 0;


            if ( this.autoStart && ! this.running ) {


                this.start();

                return 0;


            }


            if ( this.running ) {


                const newTime = now();


                diff = ( newTime - this.oldTime ) / 1000;

                this.oldTime = newTime;


                this.elapsedTime += diff;


            }


            return diff;


        }


    }


    function now() {


        return ( typeof performance === 'undefined' ? Date : performance ).now(); // see #10732


    }


    const _position$1 = /*@__PURE__*/ new Vector3();

    const _quaternion$1 = /*@__PURE__*/ new Quaternion();

    const _scale$1 = /*@__PURE__*/ new Vector3();

    const _orientation$1 = /*@__PURE__*/ new Vector3();


    class AudioListener extends Object3D {


        constructor() {


            super();


            this.type = 'AudioListener';


            this.context = AudioContext.getContext();


            this.gain = this.context.createGain();

            this.gain.connect( this.context.destination );


            this.filter = null;


            this.timeDelta = 0;


            // private


            this._clock = new Clock();


        }


        getInput() {


            return this.gain;


        }


        removeFilter() {


            if ( this.filter !== null ) {


                this.gain.disconnect( this.filter );

                this.filter.disconnect( this.context.destination );

                this.gain.connect( this.context.destination );

                this.filter = null;


            }


            return this;


        }


        getFilter() {


            return this.filter;


        }


        setFilter( value ) {


            if ( this.filter !== null ) {


                this.gain.disconnect( this.filter );

                this.filter.disconnect( this.context.destination );


            } else {


                this.gain.disconnect( this.context.destination );


            }


            this.filter = value;

            this.gain.connect( this.filter );

            this.filter.connect( this.context.destination );


            return this;


        }


        getMasterVolume() {


            return this.gain.gain.value;


        }


        setMasterVolume( value ) {


            this.gain.gain.setTargetAtTime( value, this.context.currentTime, 0.01 );


            return this;


        }


        updateMatrixWorld( force ) {


            super.updateMatrixWorld( force );


            const listener = this.context.listener;

            const up = this.up;


            this.timeDelta = this._clock.getDelta();


            this.matrixWorld.decompose( _position$1, _quaternion$1, _scale$1 );


            _orientation$1.set( 0, 0, - 1 ).applyQuaternion( _quaternion$1 );


            if ( listener.positionX ) {


                // code path for Chrome (see #14393)


                const endTime = this.context.currentTime + this.timeDelta;


                listener.positionX.linearRampToValueAtTime( _position$1.x, endTime );

                listener.positionY.linearRampToValueAtTime( _position$1.y, endTime );

                listener.positionZ.linearRampToValueAtTime( _position$1.z, endTime );

                listener.forwardX.linearRampToValueAtTime( _orientation$1.x, endTime );

                listener.forwardY.linearRampToValueAtTime( _orientation$1.y, endTime );

                listener.forwardZ.linearRampToValueAtTime( _orientation$1.z, endTime );

                listener.upX.linearRampToValueAtTime( up.x, endTime );

                listener.upY.linearRampToValueAtTime( up.y, endTime );

                listener.upZ.linearRampToValueAtTime( up.z, endTime );


            } else {


                listener.setPosition( _position$1.x, _position$1.y, _position$1.z );

                listener.setOrientation( _orientation$1.x, _orientation$1.y, _orientation$1.z, up.x, up.y, up.z );


            }


        }


    }


    class Audio extends Object3D {


        constructor( listener ) {


            super();


            this.type = 'Audio';


            this.listener = listener;

            this.context = listener.context;


            this.gain = this.context.createGain();

            this.gain.connect( listener.getInput() );


            this.autoplay = false;


            this.buffer = null;

            this.detune = 0;

            this.loop = false;

            this.loopStart = 0;

            this.loopEnd = 0;

            this.offset = 0;

            this.duration = undefined;

            this.playbackRate = 1;

            this.isPlaying = false;

            this.hasPlaybackControl = true;

            this.source = null;

            this.sourceType = 'empty';


            this._startedAt = 0;

            this._progress = 0;

            this._connected = false;


            this.filters = [];


        }


        getOutput() {


            return this.gain;


        }


        setNodeSource( audioNode ) {


            this.hasPlaybackControl = false;

            this.sourceType = 'audioNode';

            this.source = audioNode;

            this.connect();


            return this;


        }


        setMediaElementSource( mediaElement ) {


            this.hasPlaybackControl = false;

            this.sourceType = 'mediaNode';

            this.source = this.context.createMediaElementSource( mediaElement );

            this.connect();


            return this;


        }


        setMediaStreamSource( mediaStream ) {


            this.hasPlaybackControl = false;

            this.sourceType = 'mediaStreamNode';

            this.source = this.context.createMediaStreamSource( mediaStream );

            this.connect();


            return this;


        }


        setBuffer( audioBuffer ) {


            this.buffer = audioBuffer;

            this.sourceType = 'buffer';


            if ( this.autoplay ) this.play();


            return this;


        }


        play( delay = 0 ) {


            if ( this.isPlaying === true ) {


                console.warn( 'THREE.Audio: Audio is already playing.' );

                return;


            }


            if ( this.hasPlaybackControl === false ) {


                console.warn( 'THREE.Audio: this Audio has no playback control.' );

                return;


            }


            this._startedAt = this.context.currentTime + delay;


            const source = this.context.createBufferSource();

            source.buffer = this.buffer;

            source.loop = this.loop;

            source.loopStart = this.loopStart;

            source.loopEnd = this.loopEnd;

            source.onended = this.onEnded.bind( this );

            source.start( this._startedAt, this._progress + this.offset, this.duration );


            this.isPlaying = true;


            this.source = source;


            this.setDetune( this.detune );

            this.setPlaybackRate( this.playbackRate );


            return this.connect();


        }


        pause() {


            if ( this.hasPlaybackControl === false ) {


                console.warn( 'THREE.Audio: this Audio has no playback control.' );

                return;


            }


            if ( this.isPlaying === true ) {


                // update current progress


                this._progress += Math.max( this.context.currentTime - this._startedAt, 0 ) * this.playbackRate;


                if ( this.loop === true ) {


                    // ensure _progress does not exceed duration with looped audios


                    this._progress = this._progress % ( this.duration || this.buffer.duration );


                }


                this.source.stop();

                this.source.onended = null;


                this.isPlaying = false;


            }


            return this;


        }


        stop() {


            if ( this.hasPlaybackControl === false ) {


                console.warn( 'THREE.Audio: this Audio has no playback control.' );

                return;


            }


            this._progress = 0;


            if ( this.source !== null ) {


                this.source.stop();

                this.source.onended = null;


            }


            this.isPlaying = false;


            return this;


        }


        connect() {


            if ( this.filters.length > 0 ) {


                this.source.connect( this.filters[ 0 ] );


                for ( let i = 1, l = this.filters.length; i < l; i ++ ) {


                    this.filters[ i - 1 ].connect( this.filters[ i ] );


                }


                this.filters[ this.filters.length - 1 ].connect( this.getOutput() );


            } else {


                this.source.connect( this.getOutput() );


            }


            this._connected = true;


            return this;


        }


        disconnect() {


            if ( this._connected === false ) {


                return;


            }


            if ( this.filters.length > 0 ) {


                this.source.disconnect( this.filters[ 0 ] );


                for ( let i = 1, l = this.filters.length; i < l; i ++ ) {


                    this.filters[ i - 1 ].disconnect( this.filters[ i ] );


                }


                this.filters[ this.filters.length - 1 ].disconnect( this.getOutput() );


            } else {


                this.source.disconnect( this.getOutput() );


            }


            this._connected = false;


            return this;


        }


        getFilters() {


            return this.filters;


        }


        setFilters( value ) {


            if ( ! value ) value = [];


            if ( this._connected === true ) {


                this.disconnect();

                this.filters = value.slice();

                this.connect();


            } else {


                this.filters = value.slice();


            }


            return this;


        }


        setDetune( value ) {


            this.detune = value;


            if ( this.source.detune === undefined ) return; // only set detune when available


            if ( this.isPlaying === true ) {


                this.source.detune.setTargetAtTime( this.detune, this.context.currentTime, 0.01 );


            }


            return this;


        }


        getDetune() {


            return this.detune;


        }


        getFilter() {


            return this.getFilters()[ 0 ];


        }


        setFilter( filter ) {


            return this.setFilters( filter ? [ filter ] : [] );


        }


        setPlaybackRate( value ) {


            if ( this.hasPlaybackControl === false ) {


                console.warn( 'THREE.Audio: this Audio has no playback control.' );

                return;


            }


            this.playbackRate = value;


            if ( this.isPlaying === true ) {


                this.source.playbackRate.setTargetAtTime( this.playbackRate, this.context.currentTime, 0.01 );


            }


            return this;


        }


        getPlaybackRate() {


            return this.playbackRate;


        }


        onEnded() {


            this.isPlaying = false;


        }


        getLoop() {


            if ( this.hasPlaybackControl === false ) {


                console.warn( 'THREE.Audio: this Audio has no playback control.' );

                return false;


            }


            return this.loop;


        }


        setLoop( value ) {


            if ( this.hasPlaybackControl === false ) {


                console.warn( 'THREE.Audio: this Audio has no playback control.' );

                return;


            }


            this.loop = value;


            if ( this.isPlaying === true ) {


                this.source.loop = this.loop;


            }


            return this;


        }


        setLoopStart( value ) {


            this.loopStart = value;


            return this;


        }


        setLoopEnd( value ) {


            this.loopEnd = value;


            return this;


        }


        getVolume() {


            return this.gain.gain.value;


        }


        setVolume( value ) {


            this.gain.gain.setTargetAtTime( value, this.context.currentTime, 0.01 );


            return this;


        }


    }


    const _position = /*@__PURE__*/ new Vector3();

    const _quaternion = /*@__PURE__*/ new Quaternion();

    const _scale = /*@__PURE__*/ new Vector3();

    const _orientation = /*@__PURE__*/ new Vector3();


    class PositionalAudio extends Audio {


        constructor( listener ) {


            super( listener );


            this.panner = this.context.createPanner();

            this.panner.panningModel = 'HRTF';

            this.panner.connect( this.gain );


        }


        connect() {


            super.connect();


            this.panner.connect( this.gain );


        }


        disconnect() {


            super.disconnect();


            this.panner.disconnect( this.gain );


        }


        getOutput() {


            return this.panner;


        }


        getRefDistance() {


            return this.panner.refDistance;


        }


        setRefDistance( value ) {


            this.panner.refDistance = value;


            return this;


        }


        getRolloffFactor() {


            return this.panner.rolloffFactor;


        }


        setRolloffFactor( value ) {


            this.panner.rolloffFactor = value;


            return this;


        }


        getDistanceModel() {


            return this.panner.distanceModel;


        }


        setDistanceModel( value ) {


            this.panner.distanceModel = value;


            return this;


        }


        getMaxDistance() {


            return this.panner.maxDistance;


        }


        setMaxDistance( value ) {


            this.panner.maxDistance = value;


            return this;


        }


        setDirectionalCone( coneInnerAngle, coneOuterAngle, coneOuterGain ) {


            this.panner.coneInnerAngle = coneInnerAngle;

            this.panner.coneOuterAngle = coneOuterAngle;

            this.panner.coneOuterGain = coneOuterGain;


            return this;


        }


        updateMatrixWorld( force ) {


            super.updateMatrixWorld( force );


            if ( this.hasPlaybackControl === true && this.isPlaying === false ) return;


            this.matrixWorld.decompose( _position, _quaternion, _scale );


            _orientation.set( 0, 0, 1 ).applyQuaternion( _quaternion );


            const panner = this.panner;


            if ( panner.positionX ) {


                // code path for Chrome and Firefox (see #14393)


                const endTime = this.context.currentTime + this.listener.timeDelta;


                panner.positionX.linearRampToValueAtTime( _position.x, endTime );

                panner.positionY.linearRampToValueAtTime( _position.y, endTime );

                panner.positionZ.linearRampToValueAtTime( _position.z, endTime );

                panner.orientationX.linearRampToValueAtTime( _orientation.x, endTime );

                panner.orientationY.linearRampToValueAtTime( _orientation.y, endTime );

                panner.orientationZ.linearRampToValueAtTime( _orientation.z, endTime );


            } else {


                panner.setPosition( _position.x, _position.y, _position.z );

                panner.setOrientation( _orientation.x, _orientation.y, _orientation.z );


            }


        }


    }


    class AudioAnalyser {


        constructor( audio, fftSize = 2048 ) {


            this.analyser = audio.context.createAnalyser();

            this.analyser.fftSize = fftSize;


            this.data = new Uint8Array( this.analyser.frequencyBinCount );


            audio.getOutput().connect( this.analyser );


        }


        getFrequencyData() {


            this.analyser.getByteFrequencyData( this.data );


            return this.data;


        }


        getAverageFrequency() {


            let value = 0;

            const data = this.getFrequencyData();


            for ( let i = 0; i < data.length; i ++ ) {


                value += data[ i ];


            }


            return value / data.length;


        }


    }


    class PropertyMixer {


        constructor( binding, typeName, valueSize ) {


            this.binding = binding;

            this.valueSize = valueSize;


            let mixFunction,

                mixFunctionAdditive,

                setIdentity;


            // buffer layout: [ incoming | accu0 | accu1 | orig | addAccu | (optional work) ]

            //

            // interpolators can use .buffer as their .result

            // the data then goes to 'incoming'

            //

            // 'accu0' and 'accu1' are used frame-interleaved for

            // the cumulative result and are compared to detect

            // changes

            //

            // 'orig' stores the original state of the property

            //

            // 'add' is used for additive cumulative results

            //

            // 'work' is optional and is only present for quaternion types. It is used

            // to store intermediate quaternion multiplication results


            switch ( typeName ) {


                case 'quaternion':

                    mixFunction = this._slerp;

                    mixFunctionAdditive = this._slerpAdditive;

                    setIdentity = this._setAdditiveIdentityQuaternion;


                    this.buffer = new Float64Array( valueSize * 6 );

                    this._workIndex = 5;

                    break;


                case 'string':

                case 'bool':

                    mixFunction = this._select;


                    // Use the regular mix function and for additive on these types,

                    // additive is not relevant for non-numeric types

                    mixFunctionAdditive = this._select;


                    setIdentity = this._setAdditiveIdentityOther;


                    this.buffer = new Array( valueSize * 5 );

                    break;


                default:

                    mixFunction = this._lerp;

                    mixFunctionAdditive = this._lerpAdditive;

                    setIdentity = this._setAdditiveIdentityNumeric;


                    this.buffer = new Float64Array( valueSize * 5 );


            }


            this._mixBufferRegion = mixFunction;

            this._mixBufferRegionAdditive = mixFunctionAdditive;

            this._setIdentity = setIdentity;

            this._origIndex = 3;

            this._addIndex = 4;


            this.cumulativeWeight = 0;

            this.cumulativeWeightAdditive = 0;


            this.useCount = 0;

            this.referenceCount = 0;


        }


        // accumulate data in the 'incoming' region into 'accu<i>'

        accumulate( accuIndex, weight ) {


            // note: happily accumulating nothing when weight = 0, the caller knows

            // the weight and shouldn't have made the call in the first place


            const buffer = this.buffer,

                stride = this.valueSize,

                offset = accuIndex * stride + stride;


            let currentWeight = this.cumulativeWeight;


            if ( currentWeight === 0 ) {


                // accuN := incoming * weight


                for ( let i = 0; i !== stride; ++ i ) {


                    buffer[ offset + i ] = buffer[ i ];


                }


                currentWeight = weight;


            } else {


                // accuN := accuN + incoming * weight


                currentWeight += weight;

                const mix = weight / currentWeight;

                this._mixBufferRegion( buffer, offset, 0, mix, stride );


            }


            this.cumulativeWeight = currentWeight;


        }


        // accumulate data in the 'incoming' region into 'add'

        accumulateAdditive( weight ) {


            const buffer = this.buffer,

                stride = this.valueSize,

                offset = stride * this._addIndex;


            if ( this.cumulativeWeightAdditive === 0 ) {


                // add = identity


                this._setIdentity();


            }


            // add := add + incoming * weight


            this._mixBufferRegionAdditive( buffer, offset, 0, weight, stride );

            this.cumulativeWeightAdditive += weight;


        }


        // apply the state of 'accu<i>' to the binding when accus differ

        apply( accuIndex ) {


            const stride = this.valueSize,

                buffer = this.buffer,

                offset = accuIndex * stride + stride,


                weight = this.cumulativeWeight,

                weightAdditive = this.cumulativeWeightAdditive,


                binding = this.binding;


            this.cumulativeWeight = 0;

            this.cumulativeWeightAdditive = 0;


            if ( weight < 1 ) {


                // accuN := accuN + original * ( 1 - cumulativeWeight )


                const originalValueOffset = stride * this._origIndex;


                this._mixBufferRegion(

                    buffer, offset, originalValueOffset, 1 - weight, stride );


            }


            if ( weightAdditive > 0 ) {


                // accuN := accuN + additive accuN


                this._mixBufferRegionAdditive( buffer, offset, this._addIndex * stride, 1, stride );


            }


            for ( let i = stride, e = stride + stride; i !== e; ++ i ) {


                if ( buffer[ i ] !== buffer[ i + stride ] ) {


                    // value has changed -> update scene graph


                    binding.setValue( buffer, offset );

                    break;


                }


            }


        }


        // remember the state of the bound property and copy it to both accus

        saveOriginalState() {


            const binding = this.binding;


            const buffer = this.buffer,

                stride = this.valueSize,


                originalValueOffset = stride * this._origIndex;


            binding.getValue( buffer, originalValueOffset );


            // accu[0..1] := orig -- initially detect changes against the original

            for ( let i = stride, e = originalValueOffset; i !== e; ++ i ) {


                buffer[ i ] = buffer[ originalValueOffset + ( i % stride ) ];


            }


            // Add to identity for additive

            this._setIdentity();


            this.cumulativeWeight = 0;

            this.cumulativeWeightAdditive = 0;


        }


        // apply the state previously taken via 'saveOriginalState' to the binding

        restoreOriginalState() {


            const originalValueOffset = this.valueSize * 3;

            this.binding.setValue( this.buffer, originalValueOffset );


        }


        _setAdditiveIdentityNumeric() {


            const startIndex = this._addIndex * this.valueSize;

            const endIndex = startIndex + this.valueSize;


            for ( let i = startIndex; i < endIndex; i ++ ) {


                this.buffer[ i ] = 0;


            }


        }


        _setAdditiveIdentityQuaternion() {


            this._setAdditiveIdentityNumeric();

            this.buffer[ this._addIndex * this.valueSize + 3 ] = 1;


        }


        _setAdditiveIdentityOther() {


            const startIndex = this._origIndex * this.valueSize;

            const targetIndex = this._addIndex * this.valueSize;


            for ( let i = 0; i < this.valueSize; i ++ ) {


                this.buffer[ targetIndex + i ] = this.buffer[ startIndex + i ];


            }


        }


        // mix functions


        _select( buffer, dstOffset, srcOffset, t, stride ) {


            if ( t >= 0.5 ) {


                for ( let i = 0; i !== stride; ++ i ) {


                    buffer[ dstOffset + i ] = buffer[ srcOffset + i ];


                }


            }


        }


        _slerp( buffer, dstOffset, srcOffset, t ) {


            Quaternion.slerpFlat( buffer, dstOffset, buffer, dstOffset, buffer, srcOffset, t );


        }


        _slerpAdditive( buffer, dstOffset, srcOffset, t, stride ) {


            const workOffset = this._workIndex * stride;


            // Store result in intermediate buffer offset

            Quaternion.multiplyQuaternionsFlat( buffer, workOffset, buffer, dstOffset, buffer, srcOffset );


            // Slerp to the intermediate result

            Quaternion.slerpFlat( buffer, dstOffset, buffer, dstOffset, buffer, workOffset, t );


        }


        _lerp( buffer, dstOffset, srcOffset, t, stride ) {


            const s = 1 - t;


            for ( let i = 0; i !== stride; ++ i ) {


                const j = dstOffset + i;


                buffer[ j ] = buffer[ j ] * s + buffer[ srcOffset + i ] * t;


            }


        }


        _lerpAdditive( buffer, dstOffset, srcOffset, t, stride ) {


            for ( let i = 0; i !== stride; ++ i ) {


                const j = dstOffset + i;


                buffer[ j ] = buffer[ j ] + buffer[ srcOffset + i ] * t;


            }


        }


    }


    // Characters [].:/ are reserved for track binding syntax.

    const _RESERVED_CHARS_RE = '\\[\\]\\.:\\/';

    const _reservedRe = new RegExp( '[' + _RESERVED_CHARS_RE + ']', 'g' );


    // Attempts to allow node names from any language. ES5's `\w` regexp matches

    // only latin characters, and the unicode \p{L} is not yet supported. So

    // instead, we exclude reserved characters and match everything else.

    const _wordChar = '[^' + _RESERVED_CHARS_RE + ']';

    const _wordCharOrDot = '[^' + _RESERVED_CHARS_RE.replace( '\\.', '' ) + ']';


    // Parent directories, delimited by '/' or ':'. Currently unused, but must

    // be matched to parse the rest of the track name.

    const _directoryRe = /*@__PURE__*/ /((?:WC+[\/:])*)/.source.replace( 'WC', _wordChar );


    // Target node. May contain word characters (a-zA-Z0-9_) and '.' or '-'.

    const _nodeRe = /*@__PURE__*/ /(WCOD+)?/.source.replace( 'WCOD', _wordCharOrDot );


    // Object on target node, and accessor. May not contain reserved

    // characters. Accessor may contain any character except closing bracket.

    const _objectRe = /*@__PURE__*/ /(?:\.(WC+)(?:\[(.+)\])?)?/.source.replace( 'WC', _wordChar );


    // Property and accessor. May not contain reserved characters. Accessor may

    // contain any non-bracket characters.

    const _propertyRe = /*@__PURE__*/ /\.(WC+)(?:\[(.+)\])?/.source.replace( 'WC', _wordChar );


    const _trackRe = new RegExp( ''

        + '^'

        + _directoryRe

        + _nodeRe

        + _objectRe

        + _propertyRe

        + '$'

    );


    const _supportedObjectNames = [ 'material', 'materials', 'bones', 'map' ];


    class Composite {


        constructor( targetGroup, path, optionalParsedPath ) {


            const parsedPath = optionalParsedPath || PropertyBinding.parseTrackName( path );


            this._targetGroup = targetGroup;

            this._bindings = targetGroup.subscribe_( path, parsedPath );


        }


        getValue( array, offset ) {


            this.bind(); // bind all binding


            const firstValidIndex = this._targetGroup.nCachedObjects_,

                binding = this._bindings[ firstValidIndex ];


            // and only call .getValue on the first

            if ( binding !== undefined ) binding.getValue( array, offset );


        }


        setValue( array, offset ) {


            const bindings = this._bindings;


            for ( let i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {


                bindings[ i ].setValue( array, offset );


            }


        }


        bind() {


            const bindings = this._bindings;


            for ( let i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {


                bindings[ i ].bind();


            }


        }


        unbind() {


            const bindings = this._bindings;


            for ( let i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {


                bindings[ i ].unbind();


            }


        }


    }


    // Note: This class uses a State pattern on a per-method basis:

    // 'bind' sets 'this.getValue' / 'setValue' and shadows the

    // prototype version of these methods with one that represents

    // the bound state. When the property is not found, the methods

    // become no-ops.

    class PropertyBinding {


        constructor( rootNode, path, parsedPath ) {


            this.path = path;

            this.parsedPath = parsedPath || PropertyBinding.parseTrackName( path );


            this.node = PropertyBinding.findNode( rootNode, this.parsedPath.nodeName );


            this.rootNode = rootNode;


            // initial state of these methods that calls 'bind'

            this.getValue = this._getValue_unbound;

            this.setValue = this._setValue_unbound;


        }


        static create( root, path, parsedPath ) {


            if ( ! ( root && root.isAnimationObjectGroup ) ) {


                return new PropertyBinding( root, path, parsedPath );


            } else {


                return new PropertyBinding.Composite( root, path, parsedPath );


            }


        }


        static sanitizeNodeName( name ) {


            return name.replace( /\s/g, '_' ).replace( _reservedRe, '' );


        }


        static parseTrackName( trackName ) {


            const matches = _trackRe.exec( trackName );


            if ( matches === null ) {


                throw new Error( 'PropertyBinding: Cannot parse trackName: ' + trackName );


            }


            const results = {

                // directoryName: matches[ 1 ], // (tschw) currently unused

                nodeName: matches[ 2 ],

                objectName: matches[ 3 ],

                objectIndex: matches[ 4 ],

                propertyName: matches[ 5 ], // required

                propertyIndex: matches[ 6 ]

            };


            const lastDot = results.nodeName && results.nodeName.lastIndexOf( '.' );


            if ( lastDot !== undefined && lastDot !== - 1 ) {


                const objectName = results.nodeName.substring( lastDot + 1 );


                // Object names must be checked against an allowlist. Otherwise, there

                // is no way to parse 'foo.bar.baz': 'baz' must be a property, but

                // 'bar' could be the objectName, or part of a nodeName (which can

                // include '.' characters).

                if ( _supportedObjectNames.indexOf( objectName ) !== - 1 ) {


                    results.nodeName = results.nodeName.substring( 0, lastDot );

                    results.objectName = objectName;


                }


            }


            if ( results.propertyName === null || results.propertyName.length === 0 ) {


                throw new Error( 'PropertyBinding: can not parse propertyName from trackName: ' + trackName );


            }


            return results;


        }


        static findNode( root, nodeName ) {


            if ( nodeName === undefined || nodeName === '' || nodeName === '.' || nodeName === - 1 || nodeName === root.name || nodeName === root.uuid ) {


                return root;


            }


            // search into skeleton bones.

            if ( root.skeleton ) {


                const bone = root.skeleton.getBoneByName( nodeName );


                if ( bone !== undefined ) {


                    return bone;


                }


            }


            // search into node subtree.

            if ( root.children ) {


                const searchNodeSubtree = function ( children ) {


                    for ( let i = 0; i < children.length; i ++ ) {


                        const childNode = children[ i ];


                        if ( childNode.name === nodeName || childNode.uuid === nodeName ) {


                            return childNode;


                        }


                        const result = searchNodeSubtree( childNode.children );


                        if ( result ) return result;


                    }


                    return null;


                };


                const subTreeNode = searchNodeSubtree( root.children );


                if ( subTreeNode ) {


                    return subTreeNode;


                }


            }


            return null;


        }


        // these are used to "bind" a nonexistent property

        _getValue_unavailable() {}

        _setValue_unavailable() {}


        // Getters


        _getValue_direct( buffer, offset ) {


            buffer[ offset ] = this.targetObject[ this.propertyName ];


        }


        _getValue_array( buffer, offset ) {


            const source = this.resolvedProperty;


            for ( let i = 0, n = source.length; i !== n; ++ i ) {


                buffer[ offset ++ ] = source[ i ];


            }


        }


        _getValue_arrayElement( buffer, offset ) {


            buffer[ offset ] = this.resolvedProperty[ this.propertyIndex ];


        }


        _getValue_toArray( buffer, offset ) {


            this.resolvedProperty.toArray( buffer, offset );


        }


        // Direct


        _setValue_direct( buffer, offset ) {


            this.targetObject[ this.propertyName ] = buffer[ offset ];


        }


        _setValue_direct_setNeedsUpdate( buffer, offset ) {


            this.targetObject[ this.propertyName ] = buffer[ offset ];

            this.targetObject.needsUpdate = true;


        }


        _setValue_direct_setMatrixWorldNeedsUpdate( buffer, offset ) {


            this.targetObject[ this.propertyName ] = buffer[ offset ];

            this.targetObject.matrixWorldNeedsUpdate = true;


        }


        // EntireArray


        _setValue_array( buffer, offset ) {


            const dest = this.resolvedProperty;


            for ( let i = 0, n = dest.length; i !== n; ++ i ) {


                dest[ i ] = buffer[ offset ++ ];


            }


        }


        _setValue_array_setNeedsUpdate( buffer, offset ) {


            const dest = this.resolvedProperty;


            for ( let i = 0, n = dest.length; i !== n; ++ i ) {


                dest[ i ] = buffer[ offset ++ ];


            }


            this.targetObject.needsUpdate = true;


        }


        _setValue_array_setMatrixWorldNeedsUpdate( buffer, offset ) {


            const dest = this.resolvedProperty;


            for ( let i = 0, n = dest.length; i !== n; ++ i ) {


                dest[ i ] = buffer[ offset ++ ];


            }


            this.targetObject.matrixWorldNeedsUpdate = true;


        }


        // ArrayElement


        _setValue_arrayElement( buffer, offset ) {


            this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];


        }


        _setValue_arrayElement_setNeedsUpdate( buffer, offset ) {


            this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];

            this.targetObject.needsUpdate = true;


        }


        _setValue_arrayElement_setMatrixWorldNeedsUpdate( buffer, offset ) {


            this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];

            this.targetObject.matrixWorldNeedsUpdate = true;


        }


        // HasToFromArray


        _setValue_fromArray( buffer, offset ) {


            this.resolvedProperty.fromArray( buffer, offset );


        }


        _setValue_fromArray_setNeedsUpdate( buffer, offset ) {


            this.resolvedProperty.fromArray( buffer, offset );

            this.targetObject.needsUpdate = true;


        }


        _setValue_fromArray_setMatrixWorldNeedsUpdate( buffer, offset ) {


            this.resolvedProperty.fromArray( buffer, offset );

            this.targetObject.matrixWorldNeedsUpdate = true;


        }


        _getValue_unbound( targetArray, offset ) {


            this.bind();

            this.getValue( targetArray, offset );


        }


        _setValue_unbound( sourceArray, offset ) {


            this.bind();

            this.setValue( sourceArray, offset );


        }


        // create getter / setter pair for a property in the scene graph

        bind() {


            let targetObject = this.node;

            const parsedPath = this.parsedPath;


            const objectName = parsedPath.objectName;

            const propertyName = parsedPath.propertyName;

            let propertyIndex = parsedPath.propertyIndex;


            if ( ! targetObject ) {


                targetObject = PropertyBinding.findNode( this.rootNode, parsedPath.nodeName );


                this.node = targetObject;


            }


            // set fail state so we can just 'return' on error

            this.getValue = this._getValue_unavailable;

            this.setValue = this._setValue_unavailable;


            // ensure there is a value node

            if ( ! targetObject ) {


                console.warn( 'THREE.PropertyBinding: No target node found for track: ' + this.path + '.' );

                return;


            }


            if ( objectName ) {


                let objectIndex = parsedPath.objectIndex;


                // special cases were we need to reach deeper into the hierarchy to get the face materials....

                switch ( objectName ) {


                    case 'materials':


                        if ( ! targetObject.material ) {


                            console.error( 'THREE.PropertyBinding: Can not bind to material as node does not have a material.', this );

                            return;


                        }


                        if ( ! targetObject.material.materials ) {


                            console.error( 'THREE.PropertyBinding: Can not bind to material.materials as node.material does not have a materials array.', this );

                            return;


                        }


                        targetObject = targetObject.material.materials;


                        break;


                    case 'bones':


                        if ( ! targetObject.skeleton ) {


                            console.error( 'THREE.PropertyBinding: Can not bind to bones as node does not have a skeleton.', this );

                            return;


                        }


                        // potential future optimization: skip this if propertyIndex is already an integer

                        // and convert the integer string to a true integer.


                        targetObject = targetObject.skeleton.bones;


                        // support resolving morphTarget names into indices.

                        for ( let i = 0; i < targetObject.length; i ++ ) {


                            if ( targetObject[ i ].name === objectIndex ) {


                                objectIndex = i;

                                break;


                            }


                        }


                        break;


                    case 'map':


                        if ( 'map' in targetObject ) {


                            targetObject = targetObject.map;

                            break;


                        }


                        if ( ! targetObject.material ) {


                            console.error( 'THREE.PropertyBinding: Can not bind to material as node does not have a material.', this );

                            return;


                        }


                        if ( ! targetObject.material.map ) {


                            console.error( 'THREE.PropertyBinding: Can not bind to material.map as node.material does not have a map.', this );

                            return;


                        }


                        targetObject = targetObject.material.map;

                        break;


                    default:


                        if ( targetObject[ objectName ] === undefined ) {


                            console.error( 'THREE.PropertyBinding: Can not bind to objectName of node undefined.', this );

                            return;


                        }


                        targetObject = targetObject[ objectName ];


                }


                if ( objectIndex !== undefined ) {


                    if ( targetObject[ objectIndex ] === undefined ) {


                        console.error( 'THREE.PropertyBinding: Trying to bind to objectIndex of objectName, but is undefined.', this, targetObject );

                        return;


                    }


                    targetObject = targetObject[ objectIndex ];


                }


            }


            // resolve property

            const nodeProperty = targetObject[ propertyName ];


            if ( nodeProperty === undefined ) {


                const nodeName = parsedPath.nodeName;


                console.error( 'THREE.PropertyBinding: Trying to update property for track: ' + nodeName +

                    '.' + propertyName + ' but it wasn\'t found.', targetObject );

                return;


            }


            // determine versioning scheme

            let versioning = this.Versioning.None;


            this.targetObject = targetObject;


            if ( targetObject.needsUpdate !== undefined ) { // material


                versioning = this.Versioning.NeedsUpdate;


            } else if ( targetObject.matrixWorldNeedsUpdate !== undefined ) { // node transform


                versioning = this.Versioning.MatrixWorldNeedsUpdate;


            }


            // determine how the property gets bound

            let bindingType = this.BindingType.Direct;


            if ( propertyIndex !== undefined ) {


                // access a sub element of the property array (only primitives are supported right now)


                if ( propertyName === 'morphTargetInfluences' ) {


                    // potential optimization, skip this if propertyIndex is already an integer, and convert the integer string to a true integer.


                    // support resolving morphTarget names into indices.

                    if ( ! targetObject.geometry ) {


                        console.error( 'THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.', this );

                        return;


                    }


                    if ( ! targetObject.geometry.morphAttributes ) {


                        console.error( 'THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.morphAttributes.', this );

                        return;


                    }


                    if ( targetObject.morphTargetDictionary[ propertyIndex ] !== undefined ) {


                        propertyIndex = targetObject.morphTargetDictionary[ propertyIndex ];


                    }


                }


                bindingType = this.BindingType.ArrayElement;


                this.resolvedProperty = nodeProperty;

                this.propertyIndex = propertyIndex;


            } else if ( nodeProperty.fromArray !== undefined && nodeProperty.toArray !== undefined ) {


                // must use copy for Object3D.Euler/Quaternion


                bindingType = this.BindingType.HasFromToArray;


                this.resolvedProperty = nodeProperty;


            } else if ( Array.isArray( nodeProperty ) ) {


                bindingType = this.BindingType.EntireArray;


                this.resolvedProperty = nodeProperty;


            } else {


                this.propertyName = propertyName;


            }


            // select getter / setter

            this.getValue = this.GetterByBindingType[ bindingType ];

            this.setValue = this.SetterByBindingTypeAndVersioning[ bindingType ][ versioning ];


        }


        unbind() {


            this.node = null;


            // back to the prototype version of getValue / setValue

            // note: avoiding to mutate the shape of 'this' via 'delete'

            this.getValue = this._getValue_unbound;

            this.setValue = this._setValue_unbound;


        }


    }


    PropertyBinding.Composite = Composite;


    PropertyBinding.prototype.BindingType = {

        Direct: 0,

        EntireArray: 1,

        ArrayElement: 2,

        HasFromToArray: 3

    };


    PropertyBinding.prototype.Versioning = {

        None: 0,

        NeedsUpdate: 1,

        MatrixWorldNeedsUpdate: 2

    };


    PropertyBinding.prototype.GetterByBindingType = [


        PropertyBinding.prototype._getValue_direct,

        PropertyBinding.prototype._getValue_array,

        PropertyBinding.prototype._getValue_arrayElement,

        PropertyBinding.prototype._getValue_toArray,


    ];


    PropertyBinding.prototype.SetterByBindingTypeAndVersioning = [


        [

            // Direct

            PropertyBinding.prototype._setValue_direct,

            PropertyBinding.prototype._setValue_direct_setNeedsUpdate,

            PropertyBinding.prototype._setValue_direct_setMatrixWorldNeedsUpdate,


        ], [


            // EntireArray


            PropertyBinding.prototype._setValue_array,

            PropertyBinding.prototype._setValue_array_setNeedsUpdate,

            PropertyBinding.prototype._setValue_array_setMatrixWorldNeedsUpdate,


        ], [


            // ArrayElement

            PropertyBinding.prototype._setValue_arrayElement,

            PropertyBinding.prototype._setValue_arrayElement_setNeedsUpdate,

            PropertyBinding.prototype._setValue_arrayElement_setMatrixWorldNeedsUpdate,


        ], [


            // HasToFromArray

            PropertyBinding.prototype._setValue_fromArray,

            PropertyBinding.prototype._setValue_fromArray_setNeedsUpdate,

            PropertyBinding.prototype._setValue_fromArray_setMatrixWorldNeedsUpdate,


        ]


    ];


    class AnimationObjectGroup {


        constructor() {


            this.isAnimationObjectGroup = true;


            this.uuid = generateUUID();


            // cached objects followed by the active ones

            this._objects = Array.prototype.slice.call( arguments );


            this.nCachedObjects_ = 0; // threshold

            // note: read by PropertyBinding.Composite


            const indices = {};

            this._indicesByUUID = indices; // for bookkeeping


            for ( let i = 0, n = arguments.length; i !== n; ++ i ) {


                indices[ arguments[ i ].uuid ] = i;


            }


            this._paths = []; // inside: string

            this._parsedPaths = []; // inside: { we don't care, here }

            this._bindings = []; // inside: Array< PropertyBinding >

            this._bindingsIndicesByPath = {}; // inside: indices in these arrays


            const scope = this;


            this.stats = {


                objects: {

                    get total() {


                        return scope._objects.length;


                    },

                    get inUse() {


                        return this.total - scope.nCachedObjects_;


                    }

                },

                get bindingsPerObject() {


                    return scope._bindings.length;


                }


            };


        }


        add() {


            const objects = this._objects,

                indicesByUUID = this._indicesByUUID,

                paths = this._paths,

                parsedPaths = this._parsedPaths,

                bindings = this._bindings,

                nBindings = bindings.length;


            let knownObject = undefined,

                nObjects = objects.length,

                nCachedObjects = this.nCachedObjects_;


            for ( let i = 0, n = arguments.length; i !== n; ++ i ) {


                const object = arguments[ i ],

                    uuid = object.uuid;

                let index = indicesByUUID[ uuid ];


                if ( index === undefined ) {


                    // unknown object -> add it to the ACTIVE region


                    index = nObjects ++;

                    indicesByUUID[ uuid ] = index;

                    objects.push( object );


                    // accounting is done, now do the same for all bindings


                    for ( let j = 0, m = nBindings; j !== m; ++ j ) {


                        bindings[ j ].push( new PropertyBinding( object, paths[ j ], parsedPaths[ j ] ) );


                    }


                } else if ( index < nCachedObjects ) {


                    knownObject = objects[ index ];


                    // move existing object to the ACTIVE region


                    const firstActiveIndex = -- nCachedObjects,

                        lastCachedObject = objects[ firstActiveIndex ];


                    indicesByUUID[ lastCachedObject.uuid ] = index;

                    objects[ index ] = lastCachedObject;


                    indicesByUUID[ uuid ] = firstActiveIndex;

                    objects[ firstActiveIndex ] = object;


                    // accounting is done, now do the same for all bindings


                    for ( let j = 0, m = nBindings; j !== m; ++ j ) {


                        const bindingsForPath = bindings[ j ],

                            lastCached = bindingsForPath[ firstActiveIndex ];


                        let binding = bindingsForPath[ index ];


                        bindingsForPath[ index ] = lastCached;


                        if ( binding === undefined ) {


                            // since we do not bother to create new bindings

                            // for objects that are cached, the binding may

                            // or may not exist


                            binding = new PropertyBinding( object, paths[ j ], parsedPaths[ j ] );


                        }


                        bindingsForPath[ firstActiveIndex ] = binding;


                    }


                } else if ( objects[ index ] !== knownObject ) {


                    console.error( 'THREE.AnimationObjectGroup: Different objects with the same UUID ' +

                        'detected. Clean the caches or recreate your infrastructure when reloading scenes.' );


                } // else the object is already where we want it to be


            } // for arguments


            this.nCachedObjects_ = nCachedObjects;


        }


        remove() {


            const objects = this._objects,

                indicesByUUID = this._indicesByUUID,

                bindings = this._bindings,

                nBindings = bindings.length;


            let nCachedObjects = this.nCachedObjects_;


            for ( let i = 0, n = arguments.length; i !== n; ++ i ) {


                const object = arguments[ i ],

                    uuid = object.uuid,

                    index = indicesByUUID[ uuid ];


                if ( index !== undefined && index >= nCachedObjects ) {


                    // move existing object into the CACHED region


                    const lastCachedIndex = nCachedObjects ++,

                        firstActiveObject = objects[ lastCachedIndex ];


                    indicesByUUID[ firstActiveObject.uuid ] = index;

                    objects[ index ] = firstActiveObject;


                    indicesByUUID[ uuid ] = lastCachedIndex;

                    objects[ lastCachedIndex ] = object;


                    // accounting is done, now do the same for all bindings


                    for ( let j = 0, m = nBindings; j !== m; ++ j ) {


                        const bindingsForPath = bindings[ j ],

                            firstActive = bindingsForPath[ lastCachedIndex ],

                            binding = bindingsForPath[ index ];


                        bindingsForPath[ index ] = firstActive;

                        bindingsForPath[ lastCachedIndex ] = binding;


                    }


                }


            } // for arguments


            this.nCachedObjects_ = nCachedObjects;


        }


        // remove & forget

        uncache() {


            const objects = this._objects,

                indicesByUUID = this._indicesByUUID,

                bindings = this._bindings,

                nBindings = bindings.length;


            let nCachedObjects = this.nCachedObjects_,

                nObjects = objects.length;


            for ( let i = 0, n = arguments.length; i !== n; ++ i ) {


                const object = arguments[ i ],

                    uuid = object.uuid,

                    index = indicesByUUID[ uuid ];


                if ( index !== undefined ) {


                    delete indicesByUUID[ uuid ];


                    if ( index < nCachedObjects ) {


                        // object is cached, shrink the CACHED region


                        const firstActiveIndex = -- nCachedObjects,

                            lastCachedObject = objects[ firstActiveIndex ],

                            lastIndex = -- nObjects,

                            lastObject = objects[ lastIndex ];


                        // last cached object takes this object's place

                        indicesByUUID[ lastCachedObject.uuid ] = index;

                        objects[ index ] = lastCachedObject;


                        // last object goes to the activated slot and pop

                        indicesByUUID[ lastObject.uuid ] = firstActiveIndex;

                        objects[ firstActiveIndex ] = lastObject;

                        objects.pop();


                        // accounting is done, now do the same for all bindings


                        for ( let j = 0, m = nBindings; j !== m; ++ j ) {


                            const bindingsForPath = bindings[ j ],

                                lastCached = bindingsForPath[ firstActiveIndex ],

                                last = bindingsForPath[ lastIndex ];


                            bindingsForPath[ index ] = lastCached;

                            bindingsForPath[ firstActiveIndex ] = last;

                            bindingsForPath.pop();


                        }


                    } else {


                        // object is active, just swap with the last and pop


                        const lastIndex = -- nObjects,

                            lastObject = objects[ lastIndex ];


                        if ( lastIndex > 0 ) {


                            indicesByUUID[ lastObject.uuid ] = index;


                        }


                        objects[ index ] = lastObject;

                        objects.pop();


                        // accounting is done, now do the same for all bindings


                        for ( let j = 0, m = nBindings; j !== m; ++ j ) {


                            const bindingsForPath = bindings[ j ];


                            bindingsForPath[ index ] = bindingsForPath[ lastIndex ];

                            bindingsForPath.pop();


                        }


                    } // cached or active


                } // if object is known


            } // for arguments


            this.nCachedObjects_ = nCachedObjects;


        }


        // Internal interface used by befriended PropertyBinding.Composite:


        subscribe_( path, parsedPath ) {


            // returns an array of bindings for the given path that is changed

            // according to the contained objects in the group


            const indicesByPath = this._bindingsIndicesByPath;

            let index = indicesByPath[ path ];

            const bindings = this._bindings;


            if ( index !== undefined ) return bindings[ index ];


            const paths = this._paths,

                parsedPaths = this._parsedPaths,

                objects = this._objects,

                nObjects = objects.length,

                nCachedObjects = this.nCachedObjects_,

                bindingsForPath = new Array( nObjects );


            index = bindings.length;


            indicesByPath[ path ] = index;


            paths.push( path );

            parsedPaths.push( parsedPath );

            bindings.push( bindingsForPath );


            for ( let i = nCachedObjects, n = objects.length; i !== n; ++ i ) {


                const object = objects[ i ];

                bindingsForPath[ i ] = new PropertyBinding( object, path, parsedPath );


            }


            return bindingsForPath;


        }


        unsubscribe_( path ) {


            // tells the group to forget about a property path and no longer

            // update the array previously obtained with 'subscribe_'


            const indicesByPath = this._bindingsIndicesByPath,

                index = indicesByPath[ path ];


            if ( index !== undefined ) {


                const paths = this._paths,

                    parsedPaths = this._parsedPaths,

                    bindings = this._bindings,

                    lastBindingsIndex = bindings.length - 1,

                    lastBindings = bindings[ lastBindingsIndex ],

                    lastBindingsPath = path[ lastBindingsIndex ];


                indicesByPath[ lastBindingsPath ] = index;


                bindings[ index ] = lastBindings;

                bindings.pop();


                parsedPaths[ index ] = parsedPaths[ lastBindingsIndex ];

                parsedPaths.pop();


                paths[ index ] = paths[ lastBindingsIndex ];

                paths.pop();


            }


        }


    }


    class AnimationAction {


        constructor( mixer, clip, localRoot = null, blendMode = clip.blendMode ) {


            this._mixer = mixer;

            this._clip = clip;

            this._localRoot = localRoot;

            this.blendMode = blendMode;


            const tracks = clip.tracks,

                nTracks = tracks.length,

                interpolants = new Array( nTracks );


            const interpolantSettings = {

                endingStart: ZeroCurvatureEnding,

                endingEnd: ZeroCurvatureEnding

            };


            for ( let i = 0; i !== nTracks; ++ i ) {


                const interpolant = tracks[ i ].createInterpolant( null );

                interpolants[ i ] = interpolant;

                interpolant.settings = interpolantSettings;


            }


            this._interpolantSettings = interpolantSettings;


            this._interpolants = interpolants; // bound by the mixer


            // inside: PropertyMixer (managed by the mixer)

            this._propertyBindings = new Array( nTracks );


            this._cacheIndex = null; // for the memory manager

            this._byClipCacheIndex = null; // for the memory manager


            this._timeScaleInterpolant = null;

            this._weightInterpolant = null;


            this.loop = LoopRepeat;

            this._loopCount = - 1;


            // global mixer time when the action is to be started

            // it's set back to 'null' upon start of the action

            this._startTime = null;


            // scaled local time of the action

            // gets clamped or wrapped to 0..clip.duration according to loop

            this.time = 0;


            this.timeScale = 1;

            this._effectiveTimeScale = 1;


            this.weight = 1;

            this._effectiveWeight = 1;


            this.repetitions = Infinity; // no. of repetitions when looping


            this.paused = false; // true -> zero effective time scale

            this.enabled = true; // false -> zero effective weight


            this.clampWhenFinished = false;// keep feeding the last frame?


            this.zeroSlopeAtStart = true;// for smooth interpolation w/o separate

            this.zeroSlopeAtEnd = true;// clips for start, loop and end


        }


        // State & Scheduling


        play() {


            this._mixer._activateAction( this );


            return this;


        }


        stop() {


            this._mixer._deactivateAction( this );


            return this.reset();


        }


        reset() {


            this.paused = false;

            this.enabled = true;


            this.time = 0; // restart clip

            this._loopCount = - 1;// forget previous loops

            this._startTime = null;// forget scheduling


            return this.stopFading().stopWarping();


        }


        isRunning() {


            return this.enabled && ! this.paused && this.timeScale !== 0 &&

                this._startTime === null && this._mixer._isActiveAction( this );


        }


        // return true when play has been called

        isScheduled() {


            return this._mixer._isActiveAction( this );


        }


        startAt( time ) {


            this._startTime = time;


            return this;


        }


        setLoop( mode, repetitions ) {


            this.loop = mode;

            this.repetitions = repetitions;


            return this;


        }


        // Weight


        // set the weight stopping any scheduled fading

        // although .enabled = false yields an effective weight of zero, this

        // method does *not* change .enabled, because it would be confusing

        setEffectiveWeight( weight ) {


            this.weight = weight;


            // note: same logic as when updated at runtime

            this._effectiveWeight = this.enabled ? weight : 0;


            return this.stopFading();


        }


        // return the weight considering fading and .enabled

        getEffectiveWeight() {


            return this._effectiveWeight;


        }


        fadeIn( duration ) {


            return this._scheduleFading( duration, 0, 1 );


        }


        fadeOut( duration ) {


            return this._scheduleFading( duration, 1, 0 );


        }


        crossFadeFrom( fadeOutAction, duration, warp ) {


            fadeOutAction.fadeOut( duration );

            this.fadeIn( duration );


            if ( warp ) {


                const fadeInDuration = this._clip.duration,

                    fadeOutDuration = fadeOutAction._clip.duration,


                    startEndRatio = fadeOutDuration / fadeInDuration,

                    endStartRatio = fadeInDuration / fadeOutDuration;


                fadeOutAction.warp( 1.0, startEndRatio, duration );

                this.warp( endStartRatio, 1.0, duration );


            }


            return this;


        }


        crossFadeTo( fadeInAction, duration, warp ) {


            return fadeInAction.crossFadeFrom( this, duration, warp );


        }


        stopFading() {


            const weightInterpolant = this._weightInterpolant;


            if ( weightInterpolant !== null ) {


                this._weightInterpolant = null;

                this._mixer._takeBackControlInterpolant( weightInterpolant );


            }


            return this;


        }


        // Time Scale Control


        // set the time scale stopping any scheduled warping

        // although .paused = true yields an effective time scale of zero, this

        // method does *not* change .paused, because it would be confusing

        setEffectiveTimeScale( timeScale ) {


            this.timeScale = timeScale;

            this._effectiveTimeScale = this.paused ? 0 : timeScale;


            return this.stopWarping();


        }


        // return the time scale considering warping and .paused

        getEffectiveTimeScale() {


            return this._effectiveTimeScale;


        }


        setDuration( duration ) {


            this.timeScale = this._clip.duration / duration;


            return this.stopWarping();


        }


        syncWith( action ) {


            this.time = action.time;

            this.timeScale = action.timeScale;


            return this.stopWarping();


        }


        halt( duration ) {


            return this.warp( this._effectiveTimeScale, 0, duration );


        }


        warp( startTimeScale, endTimeScale, duration ) {


            const mixer = this._mixer,

                now = mixer.time,

                timeScale = this.timeScale;


            let interpolant = this._timeScaleInterpolant;


            if ( interpolant === null ) {


                interpolant = mixer._lendControlInterpolant();

                this._timeScaleInterpolant = interpolant;


            }


            const times = interpolant.parameterPositions,

                values = interpolant.sampleValues;


            times[ 0 ] = now;

            times[ 1 ] = now + duration;


            values[ 0 ] = startTimeScale / timeScale;

            values[ 1 ] = endTimeScale / timeScale;


            return this;


        }


        stopWarping() {


            const timeScaleInterpolant = this._timeScaleInterpolant;


            if ( timeScaleInterpolant !== null ) {


                this._timeScaleInterpolant = null;

                this._mixer._takeBackControlInterpolant( timeScaleInterpolant );


            }


            return this;


        }


        // Object Accessors


        getMixer() {


            return this._mixer;


        }


        getClip() {


            return this._clip;


        }


        getRoot() {


            return this._localRoot || this._mixer._root;


        }


        // Interna


        _update( time, deltaTime, timeDirection, accuIndex ) {


            // called by the mixer


            if ( ! this.enabled ) {


                // call ._updateWeight() to update ._effectiveWeight


                this._updateWeight( time );

                return;


            }


            const startTime = this._startTime;


            if ( startTime !== null ) {


                // check for scheduled start of action


                const timeRunning = ( time - startTime ) * timeDirection;

                if ( timeRunning < 0 || timeDirection === 0 ) {


                    deltaTime = 0;


                } else {


                    this._startTime = null; // unschedule

                    deltaTime = timeDirection * timeRunning;


                }


            }


            // apply time scale and advance time


            deltaTime *= this._updateTimeScale( time );

            const clipTime = this._updateTime( deltaTime );


            // note: _updateTime may disable the action resulting in

            // an effective weight of 0


            const weight = this._updateWeight( time );


            if ( weight > 0 ) {


                const interpolants = this._interpolants;

                const propertyMixers = this._propertyBindings;


                switch ( this.blendMode ) {


                    case AdditiveAnimationBlendMode:


                        for ( let j = 0, m = interpolants.length; j !== m; ++ j ) {


                            interpolants[ j ].evaluate( clipTime );

                            propertyMixers[ j ].accumulateAdditive( weight );


                        }


                        break;


                    case NormalAnimationBlendMode:

                    default:


                        for ( let j = 0, m = interpolants.length; j !== m; ++ j ) {


                            interpolants[ j ].evaluate( clipTime );

                            propertyMixers[ j ].accumulate( accuIndex, weight );


                        }


                }


            }


        }


        _updateWeight( time ) {


            let weight = 0;


            if ( this.enabled ) {


                weight = this.weight;

                const interpolant = this._weightInterpolant;


                if ( interpolant !== null ) {


                    const interpolantValue = interpolant.evaluate( time )[ 0 ];


                    weight *= interpolantValue;


                    if ( time > interpolant.parameterPositions[ 1 ] ) {


                        this.stopFading();


                        if ( interpolantValue === 0 ) {


                            // faded out, disable

                            this.enabled = false;


                        }


                    }


                }


            }


            this._effectiveWeight = weight;

            return weight;


        }


        _updateTimeScale( time ) {


            let timeScale = 0;


            if ( ! this.paused ) {


                timeScale = this.timeScale;


                const interpolant = this._timeScaleInterpolant;


                if ( interpolant !== null ) {


                    const interpolantValue = interpolant.evaluate( time )[ 0 ];


                    timeScale *= interpolantValue;


                    if ( time > interpolant.parameterPositions[ 1 ] ) {


                        this.stopWarping();


                        if ( timeScale === 0 ) {


                            // motion has halted, pause

                            this.paused = true;


                        } else {


                            // warp done - apply final time scale

                            this.timeScale = timeScale;


                        }


                    }


                }


            }


            this._effectiveTimeScale = timeScale;

            return timeScale;


        }


        _updateTime( deltaTime ) {


            const duration = this._clip.duration;

            const loop = this.loop;


            let time = this.time + deltaTime;

            let loopCount = this._loopCount;


            const pingPong = ( loop === LoopPingPong );


            if ( deltaTime === 0 ) {


                if ( loopCount === - 1 ) return time;


                return ( pingPong && ( loopCount & 1 ) === 1 ) ? duration - time : time;


            }


            if ( loop === LoopOnce ) {


                if ( loopCount === - 1 ) {


                    // just started


                    this._loopCount = 0;

                    this._setEndings( true, true, false );


                }


                handle_stop: {


                    if ( time >= duration ) {


                        time = duration;


                    } else if ( time < 0 ) {


                        time = 0;


                    } else {


                        this.time = time;


                        break handle_stop;


                    }


                    if ( this.clampWhenFinished ) this.paused = true;

                    else this.enabled = false;


                    this.time = time;


                    this._mixer.dispatchEvent( {

                        type: 'finished', action: this,

                        direction: deltaTime < 0 ? - 1 : 1

                    } );


                }


            } else { // repetitive Repeat or PingPong


                if ( loopCount === - 1 ) {


                    // just started


                    if ( deltaTime >= 0 ) {


                        loopCount = 0;


                        this._setEndings( true, this.repetitions === 0, pingPong );


                    } else {


                        // when looping in reverse direction, the initial

                        // transition through zero counts as a repetition,

                        // so leave loopCount at -1


                        this._setEndings( this.repetitions === 0, true, pingPong );


                    }


                }


                if ( time >= duration || time < 0 ) {


                    // wrap around


                    const loopDelta = Math.floor( time / duration ); // signed

                    time -= duration * loopDelta;


                    loopCount += Math.abs( loopDelta );


                    const pending = this.repetitions - loopCount;


                    if ( pending <= 0 ) {


                        // have to stop (switch state, clamp time, fire event)


                        if ( this.clampWhenFinished ) this.paused = true;

                        else this.enabled = false;


                        time = deltaTime > 0 ? duration : 0;


                        this.time = time;


                        this._mixer.dispatchEvent( {

                            type: 'finished', action: this,

                            direction: deltaTime > 0 ? 1 : - 1

                        } );


                    } else {


                        // keep running


                        if ( pending === 1 ) {


                            // entering the last round


                            const atStart = deltaTime < 0;

                            this._setEndings( atStart, ! atStart, pingPong );


                        } else {


                            this._setEndings( false, false, pingPong );


                        }


                        this._loopCount = loopCount;


                        this.time = time;


                        this._mixer.dispatchEvent( {

                            type: 'loop', action: this, loopDelta: loopDelta

                        } );


                    }


                } else {


                    this.time = time;


                }


                if ( pingPong && ( loopCount & 1 ) === 1 ) {


                    // invert time for the "pong round"


                    return duration - time;


                }


            }


            return time;


        }


        _setEndings( atStart, atEnd, pingPong ) {


            const settings = this._interpolantSettings;


            if ( pingPong ) {


                settings.endingStart = ZeroSlopeEnding;

                settings.endingEnd = ZeroSlopeEnding;


            } else {


                // assuming for LoopOnce atStart == atEnd == true


                if ( atStart ) {


                    settings.endingStart = this.zeroSlopeAtStart ? ZeroSlopeEnding : ZeroCurvatureEnding;


                } else {


                    settings.endingStart = WrapAroundEnding;


                }


                if ( atEnd ) {


                    settings.endingEnd = this.zeroSlopeAtEnd ? ZeroSlopeEnding : ZeroCurvatureEnding;


                } else {


                    settings.endingEnd   = WrapAroundEnding;


                }


            }


        }


        _scheduleFading( duration, weightNow, weightThen ) {


            const mixer = this._mixer, now = mixer.time;

            let interpolant = this._weightInterpolant;


            if ( interpolant === null ) {


                interpolant = mixer._lendControlInterpolant();

                this._weightInterpolant = interpolant;


            }


            const times = interpolant.parameterPositions,

                values = interpolant.sampleValues;


            times[ 0 ] = now;

            values[ 0 ] = weightNow;

            times[ 1 ] = now + duration;

            values[ 1 ] = weightThen;


            return this;


        }


    }


    const _controlInterpolantsResultBuffer = new Float32Array( 1 );


    class AnimationMixer extends EventDispatcher {


        constructor( root ) {


            super();


            this._root = root;

            this._initMemoryManager();

            this._accuIndex = 0;

            this.time = 0;

            this.timeScale = 1.0;


        }


        _bindAction( action, prototypeAction ) {


            const root = action._localRoot || this._root,

                tracks = action._clip.tracks,

                nTracks = tracks.length,

                bindings = action._propertyBindings,

                interpolants = action._interpolants,

                rootUuid = root.uuid,

                bindingsByRoot = this._bindingsByRootAndName;


            let bindingsByName = bindingsByRoot[ rootUuid ];


            if ( bindingsByName === undefined ) {


                bindingsByName = {};

                bindingsByRoot[ rootUuid ] = bindingsByName;


            }


            for ( let i = 0; i !== nTracks; ++ i ) {


                const track = tracks[ i ],

                    trackName = track.name;


                let binding = bindingsByName[ trackName ];


                if ( binding !== undefined ) {


                    ++ binding.referenceCount;

                    bindings[ i ] = binding;


                } else {


                    binding = bindings[ i ];


                    if ( binding !== undefined ) {


                        // existing binding, make sure the cache knows


                        if ( binding._cacheIndex === null ) {


                            ++ binding.referenceCount;

                            this._addInactiveBinding( binding, rootUuid, trackName );


                        }


                        continue;


                    }


                    const path = prototypeAction && prototypeAction.

                        _propertyBindings[ i ].binding.parsedPath;


                    binding = new PropertyMixer(

                        PropertyBinding.create( root, trackName, path ),

                        track.ValueTypeName, track.getValueSize() );


                    ++ binding.referenceCount;

                    this._addInactiveBinding( binding, rootUuid, trackName );


                    bindings[ i ] = binding;


                }


                interpolants[ i ].resultBuffer = binding.buffer;


            }


        }


        _activateAction( action ) {


            if ( ! this._isActiveAction( action ) ) {


                if ( action._cacheIndex === null ) {


                    // this action has been forgotten by the cache, but the user

                    // appears to be still using it -> rebind


                    const rootUuid = ( action._localRoot || this._root ).uuid,

                        clipUuid = action._clip.uuid,

                        actionsForClip = this._actionsByClip[ clipUuid ];


                    this._bindAction( action,

                        actionsForClip && actionsForClip.knownActions[ 0 ] );


                    this._addInactiveAction( action, clipUuid, rootUuid );


                }


                const bindings = action._propertyBindings;


                // increment reference counts / sort out state

                for ( let i = 0, n = bindings.length; i !== n; ++ i ) {


                    const binding = bindings[ i ];


                    if ( binding.useCount ++ === 0 ) {


                        this._lendBinding( binding );

                        binding.saveOriginalState();


                    }


                }


                this._lendAction( action );


            }


        }


        _deactivateAction( action ) {


            if ( this._isActiveAction( action ) ) {


                const bindings = action._propertyBindings;


                // decrement reference counts / sort out state

                for ( let i = 0, n = bindings.length; i !== n; ++ i ) {


                    const binding = bindings[ i ];


                    if ( -- binding.useCount === 0 ) {


                        binding.restoreOriginalState();

                        this._takeBackBinding( binding );


                    }


                }


                this._takeBackAction( action );


            }


        }


        // Memory manager


        _initMemoryManager() {


            this._actions = []; // 'nActiveActions' followed by inactive ones

            this._nActiveActions = 0;


            this._actionsByClip = {};

            // inside:

            // {

            //  knownActions: Array< AnimationAction > - used as prototypes

            //  actionByRoot: AnimationAction - lookup

            // }


            this._bindings = []; // 'nActiveBindings' followed by inactive ones

            this._nActiveBindings = 0;


            this._bindingsByRootAndName = {}; // inside: Map< name, PropertyMixer >


            this._controlInterpolants = []; // same game as above

            this._nActiveControlInterpolants = 0;


            const scope = this;


            this.stats = {


                actions: {

                    get total() {


                        return scope._actions.length;


                    },

                    get inUse() {


                        return scope._nActiveActions;


                    }

                },

                bindings: {

                    get total() {


                        return scope._bindings.length;


                    },

                    get inUse() {


                        return scope._nActiveBindings;


                    }

                },

                controlInterpolants: {

                    get total() {


                        return scope._controlInterpolants.length;


                    },

                    get inUse() {


                        return scope._nActiveControlInterpolants;


                    }

                }


            };


        }


        // Memory management for AnimationAction objects


        _isActiveAction( action ) {


            const index = action._cacheIndex;

            return index !== null && index < this._nActiveActions;


        }


        _addInactiveAction( action, clipUuid, rootUuid ) {


            const actions = this._actions,

                actionsByClip = this._actionsByClip;


            let actionsForClip = actionsByClip[ clipUuid ];


            if ( actionsForClip === undefined ) {


                actionsForClip = {


                    knownActions: [ action ],

                    actionByRoot: {}


                };


                action._byClipCacheIndex = 0;


                actionsByClip[ clipUuid ] = actionsForClip;


            } else {


                const knownActions = actionsForClip.knownActions;


                action._byClipCacheIndex = knownActions.length;

                knownActions.push( action );


            }


            action._cacheIndex = actions.length;

            actions.push( action );


            actionsForClip.actionByRoot[ rootUuid ] = action;


        }


        _removeInactiveAction( action ) {


            const actions = this._actions,

                lastInactiveAction = actions[ actions.length - 1 ],

                cacheIndex = action._cacheIndex;


            lastInactiveAction._cacheIndex = cacheIndex;

            actions[ cacheIndex ] = lastInactiveAction;

            actions.pop();


            action._cacheIndex = null;


            const clipUuid = action._clip.uuid,

                actionsByClip = this._actionsByClip,

                actionsForClip = actionsByClip[ clipUuid ],

                knownActionsForClip = actionsForClip.knownActions,


                lastKnownAction =

                    knownActionsForClip[ knownActionsForClip.length - 1 ],


                byClipCacheIndex = action._byClipCacheIndex;


            lastKnownAction._byClipCacheIndex = byClipCacheIndex;

            knownActionsForClip[ byClipCacheIndex ] = lastKnownAction;

            knownActionsForClip.pop();


            action._byClipCacheIndex = null;


            const actionByRoot = actionsForClip.actionByRoot,

                rootUuid = ( action._localRoot || this._root ).uuid;


            delete actionByRoot[ rootUuid ];


            if ( knownActionsForClip.length === 0 ) {


                delete actionsByClip[ clipUuid ];


            }


            this._removeInactiveBindingsForAction( action );


        }


        _removeInactiveBindingsForAction( action ) {


            const bindings = action._propertyBindings;


            for ( let i = 0, n = bindings.length; i !== n; ++ i ) {


                const binding = bindings[ i ];


                if ( -- binding.referenceCount === 0 ) {


                    this._removeInactiveBinding( binding );


                }


            }


        }


        _lendAction( action ) {


            // [ active actions |  inactive actions  ]

            // [  active actions >| inactive actions ]

            //                 s        a

            //                  <-swap->

            //                 a        s


            const actions = this._actions,

                prevIndex = action._cacheIndex,


                lastActiveIndex = this._nActiveActions ++,


                firstInactiveAction = actions[ lastActiveIndex ];


            action._cacheIndex = lastActiveIndex;

            actions[ lastActiveIndex ] = action;


            firstInactiveAction._cacheIndex = prevIndex;

            actions[ prevIndex ] = firstInactiveAction;


        }


        _takeBackAction( action ) {


            // [  active actions  | inactive actions ]

            // [ active actions |< inactive actions  ]

            //        a        s

            //         <-swap->

            //        s        a


            const actions = this._actions,

                prevIndex = action._cacheIndex,


                firstInactiveIndex = -- this._nActiveActions,


                lastActiveAction = actions[ firstInactiveIndex ];


            action._cacheIndex = firstInactiveIndex;

            actions[ firstInactiveIndex ] = action;


            lastActiveAction._cacheIndex = prevIndex;

            actions[ prevIndex ] = lastActiveAction;


        }


        // Memory management for PropertyMixer objects


        _addInactiveBinding( binding, rootUuid, trackName ) {


            const bindingsByRoot = this._bindingsByRootAndName,

                bindings = this._bindings;


            let bindingByName = bindingsByRoot[ rootUuid ];


            if ( bindingByName === undefined ) {


                bindingByName = {};

                bindingsByRoot[ rootUuid ] = bindingByName;


            }


            bindingByName[ trackName ] = binding;


            binding._cacheIndex = bindings.length;

            bindings.push( binding );


        }


        _removeInactiveBinding( binding ) {


            const bindings = this._bindings,

                propBinding = binding.binding,

                rootUuid = propBinding.rootNode.uuid,

                trackName = propBinding.path,

                bindingsByRoot = this._bindingsByRootAndName,

                bindingByName = bindingsByRoot[ rootUuid ],


                lastInactiveBinding = bindings[ bindings.length - 1 ],

                cacheIndex = binding._cacheIndex;


            lastInactiveBinding._cacheIndex = cacheIndex;

            bindings[ cacheIndex ] = lastInactiveBinding;

            bindings.pop();


            delete bindingByName[ trackName ];


            if ( Object.keys( bindingByName ).length === 0 ) {


                delete bindingsByRoot[ rootUuid ];


            }


        }


        _lendBinding( binding ) {


            const bindings = this._bindings,

                prevIndex = binding._cacheIndex,


                lastActiveIndex = this._nActiveBindings ++,


                firstInactiveBinding = bindings[ lastActiveIndex ];


            binding._cacheIndex = lastActiveIndex;

            bindings[ lastActiveIndex ] = binding;


            firstInactiveBinding._cacheIndex = prevIndex;

            bindings[ prevIndex ] = firstInactiveBinding;


        }


        _takeBackBinding( binding ) {


            const bindings = this._bindings,

                prevIndex = binding._cacheIndex,


                firstInactiveIndex = -- this._nActiveBindings,


                lastActiveBinding = bindings[ firstInactiveIndex ];


            binding._cacheIndex = firstInactiveIndex;

            bindings[ firstInactiveIndex ] = binding;


            lastActiveBinding._cacheIndex = prevIndex;

            bindings[ prevIndex ] = lastActiveBinding;


        }


        // Memory management of Interpolants for weight and time scale


        _lendControlInterpolant() {


            const interpolants = this._controlInterpolants,

                lastActiveIndex = this._nActiveControlInterpolants ++;


            let interpolant = interpolants[ lastActiveIndex ];


            if ( interpolant === undefined ) {


                interpolant = new LinearInterpolant(

                    new Float32Array( 2 ), new Float32Array( 2 ),

                    1, _controlInterpolantsResultBuffer );


                interpolant.__cacheIndex = lastActiveIndex;

                interpolants[ lastActiveIndex ] = interpolant;


            }


            return interpolant;


        }


        _takeBackControlInterpolant( interpolant ) {


            const interpolants = this._controlInterpolants,

                prevIndex = interpolant.__cacheIndex,


                firstInactiveIndex = -- this._nActiveControlInterpolants,


                lastActiveInterpolant = interpolants[ firstInactiveIndex ];


            interpolant.__cacheIndex = firstInactiveIndex;

            interpolants[ firstInactiveIndex ] = interpolant;


            lastActiveInterpolant.__cacheIndex = prevIndex;

            interpolants[ prevIndex ] = lastActiveInterpolant;


        }


        // return an action for a clip optionally using a custom root target

        // object (this method allocates a lot of dynamic memory in case a

        // previously unknown clip/root combination is specified)

        clipAction( clip, optionalRoot, blendMode ) {


            const root = optionalRoot || this._root,

                rootUuid = root.uuid;


            let clipObject = typeof clip === 'string' ? AnimationClip.findByName( root, clip ) : clip;


            const clipUuid = clipObject !== null ? clipObject.uuid : clip;


            const actionsForClip = this._actionsByClip[ clipUuid ];

            let prototypeAction = null;


            if ( blendMode === undefined ) {


                if ( clipObject !== null ) {


                    blendMode = clipObject.blendMode;


                } else {


                    blendMode = NormalAnimationBlendMode;


                }


            }


            if ( actionsForClip !== undefined ) {


                const existingAction = actionsForClip.actionByRoot[ rootUuid ];


                if ( existingAction !== undefined && existingAction.blendMode === blendMode ) {


                    return existingAction;


                }


                // we know the clip, so we don't have to parse all

                // the bindings again but can just copy

                prototypeAction = actionsForClip.knownActions[ 0 ];


                // also, take the clip from the prototype action

                if ( clipObject === null )

                    clipObject = prototypeAction._clip;


            }


            // clip must be known when specified via string

            if ( clipObject === null ) return null;


            // allocate all resources required to run it

            const newAction = new AnimationAction( this, clipObject, optionalRoot, blendMode );


            this._bindAction( newAction, prototypeAction );


            // and make the action known to the memory manager

            this._addInactiveAction( newAction, clipUuid, rootUuid );


            return newAction;


        }


        // get an existing action

        existingAction( clip, optionalRoot ) {


            const root = optionalRoot || this._root,

                rootUuid = root.uuid,


                clipObject = typeof clip === 'string' ?

                    AnimationClip.findByName( root, clip ) : clip,


                clipUuid = clipObject ? clipObject.uuid : clip,


                actionsForClip = this._actionsByClip[ clipUuid ];


            if ( actionsForClip !== undefined ) {


                return actionsForClip.actionByRoot[ rootUuid ] || null;


            }


            return null;


        }


        // deactivates all previously scheduled actions

        stopAllAction() {


            const actions = this._actions,

                nActions = this._nActiveActions;


            for ( let i = nActions - 1; i >= 0; -- i ) {


                actions[ i ].stop();


            }


            return this;


        }


        // advance the time and update apply the animation

        update( deltaTime ) {


            deltaTime *= this.timeScale;


            const actions = this._actions,

                nActions = this._nActiveActions,


                time = this.time += deltaTime,

                timeDirection = Math.sign( deltaTime ),


                accuIndex = this._accuIndex ^= 1;


            // run active actions


            for ( let i = 0; i !== nActions; ++ i ) {


                const action = actions[ i ];


                action._update( time, deltaTime, timeDirection, accuIndex );


            }


            // update scene graph


            const bindings = this._bindings,

                nBindings = this._nActiveBindings;


            for ( let i = 0; i !== nBindings; ++ i ) {


                bindings[ i ].apply( accuIndex );


            }


            return this;


        }


        // Allows you to seek to a specific time in an animation.

        setTime( timeInSeconds ) {


            this.time = 0; // Zero out time attribute for AnimationMixer object;

            for ( let i = 0; i < this._actions.length; i ++ ) {


                this._actions[ i ].time = 0; // Zero out time attribute for all associated AnimationAction objects.


            }


            return this.update( timeInSeconds ); // Update used to set exact time. Returns "this" AnimationMixer object.


        }


        // return this mixer's root target object

        getRoot() {


            return this._root;


        }


        // free all resources specific to a particular clip

        uncacheClip( clip ) {


            const actions = this._actions,

                clipUuid = clip.uuid,

                actionsByClip = this._actionsByClip,

                actionsForClip = actionsByClip[ clipUuid ];


            if ( actionsForClip !== undefined ) {


                // note: just calling _removeInactiveAction would mess up the

                // iteration state and also require updating the state we can

                // just throw away


                const actionsToRemove = actionsForClip.knownActions;


                for ( let i = 0, n = actionsToRemove.length; i !== n; ++ i ) {


                    const action = actionsToRemove[ i ];


                    this._deactivateAction( action );


                    const cacheIndex = action._cacheIndex,

                        lastInactiveAction = actions[ actions.length - 1 ];


                    action._cacheIndex = null;

                    action._byClipCacheIndex = null;


                    lastInactiveAction._cacheIndex = cacheIndex;

                    actions[ cacheIndex ] = lastInactiveAction;

                    actions.pop();


                    this._removeInactiveBindingsForAction( action );


                }


                delete actionsByClip[ clipUuid ];


            }


        }


        // free all resources specific to a particular root target object

        uncacheRoot( root ) {


            const rootUuid = root.uuid,

                actionsByClip = this._actionsByClip;


            for ( const clipUuid in actionsByClip ) {


                const actionByRoot = actionsByClip[ clipUuid ].actionByRoot,

                    action = actionByRoot[ rootUuid ];


                if ( action !== undefined ) {


                    this._deactivateAction( action );

                    this._removeInactiveAction( action );


                }


            }


            const bindingsByRoot = this._bindingsByRootAndName,

                bindingByName = bindingsByRoot[ rootUuid ];


            if ( bindingByName !== undefined ) {


                for ( const trackName in bindingByName ) {


                    const binding = bindingByName[ trackName ];

                    binding.restoreOriginalState();

                    this._removeInactiveBinding( binding );


                }


            }


        }


        // remove a targeted clip from the cache

        uncacheAction( clip, optionalRoot ) {


            const action = this.existingAction( clip, optionalRoot );


            if ( action !== null ) {


                this._deactivateAction( action );

                this._removeInactiveAction( action );


            }


        }


    }


    class Uniform {


        constructor( value ) {


            this.value = value;


        }


        clone() {


            return new Uniform( this.value.clone === undefined ? this.value : this.value.clone() );


        }


    }


    let _id = 0;


    class UniformsGroup extends EventDispatcher {


        constructor() {


            super();


            this.isUniformsGroup = true;


            Object.defineProperty( this, 'id', { value: _id ++ } );


            this.name = '';


            this.usage = StaticDrawUsage;

            this.uniforms = [];


        }


        add( uniform ) {


            this.uniforms.push( uniform );


            return this;


        }


        remove( uniform ) {


            const index = this.uniforms.indexOf( uniform );


            if ( index !== - 1 ) this.uniforms.splice( index, 1 );


            return this;


        }


        setName( name ) {


            this.name = name;


            return this;


        }


        setUsage( value ) {


            this.usage = value;


            return this;


        }


        dispose() {


            this.dispatchEvent( { type: 'dispose' } );


            return this;


        }


        copy( source ) {


            this.name = source.name;

            this.usage = source.usage;


            const uniformsSource = source.uniforms;


            this.uniforms.length = 0;


            for ( let i = 0, l = uniformsSource.length; i < l; i ++ ) {


                const uniforms = Array.isArray( uniformsSource[ i ] ) ? uniformsSource[ i ] : [ uniformsSource[ i ] ];


                for ( let j = 0; j < uniforms.length; j ++ ) {


                    this.uniforms.push( uniforms[ j ].clone() );


                }


            }


            return this;


        }


        clone() {


            return new this.constructor().copy( this );


        }


    }


    class InstancedInterleavedBuffer extends InterleavedBuffer {


        constructor( array, stride, meshPerAttribute = 1 ) {


            super( array, stride );


            this.isInstancedInterleavedBuffer = true;


            this.meshPerAttribute = meshPerAttribute;


        }


        copy( source ) {


            super.copy( source );


            this.meshPerAttribute = source.meshPerAttribute;


            return this;


        }


        clone( data ) {


            const ib = super.clone( data );


            ib.meshPerAttribute = this.meshPerAttribute;


            return ib;


        }


        toJSON( data ) {


            const json = super.toJSON( data );


            json.isInstancedInterleavedBuffer = true;

            json.meshPerAttribute = this.meshPerAttribute;


            return json;


        }


    }


    class GLBufferAttribute {


        constructor( buffer, type, itemSize, elementSize, count ) {


            this.isGLBufferAttribute = true;


            this.name = '';


            this.buffer = buffer;

            this.type = type;

            this.itemSize = itemSize;

            this.elementSize = elementSize;

            this.count = count;


            this.version = 0;


        }


        set needsUpdate( value ) {


            if ( value === true ) this.version ++;


        }


        setBuffer( buffer ) {


            this.buffer = buffer;


            return this;


        }


        setType( type, elementSize ) {


            this.type = type;

            this.elementSize = elementSize;


            return this;


        }


        setItemSize( itemSize ) {


            this.itemSize = itemSize;


            return this;


        }


        setCount( count ) {


            this.count = count;


            return this;


        }


    }


    class Raycaster {


        constructor( origin, direction, near = 0, far = Infinity ) {


            this.ray = new Ray( origin, direction );

            // direction is assumed to be normalized (for accurate distance calculations)


            this.near = near;

            this.far = far;

            this.camera = null;

            this.layers = new Layers();


            this.params = {

                Mesh: {},

                Line: { threshold: 1 },

                LOD: {},

                Points: { threshold: 1 },

                Sprite: {}

            };


        }


        set( origin, direction ) {


            // direction is assumed to be normalized (for accurate distance calculations)


            this.ray.set( origin, direction );


        }


        setFromCamera( coords, camera ) {


            if ( camera.isPerspectiveCamera ) {


                this.ray.origin.setFromMatrixPosition( camera.matrixWorld );

                this.ray.direction.set( coords.x, coords.y, 0.5 ).unproject( camera ).sub( this.ray.origin ).normalize();

                this.camera = camera;


            } else if ( camera.isOrthographicCamera ) {


                this.ray.origin.set( coords.x, coords.y, ( camera.near + camera.far ) / ( camera.near - camera.far ) ).unproject( camera ); // set origin in plane of camera

                this.ray.direction.set( 0, 0, - 1 ).transformDirection( camera.matrixWorld );

                this.camera = camera;


            } else {


                console.error( 'THREE.Raycaster: Unsupported camera type: ' + camera.type );


            }


        }


        intersectObject( object, recursive = true, intersects = [] ) {


            intersectObject( object, this, intersects, recursive );


            intersects.sort( ascSort );


            return intersects;


        }


        intersectObjects( objects, recursive = true, intersects = [] ) {


            for ( let i = 0, l = objects.length; i < l; i ++ ) {


                intersectObject( objects[ i ], this, intersects, recursive );


            }


            intersects.sort( ascSort );


            return intersects;


        }


    }


    function ascSort( a, b ) {


        return a.distance - b.distance;


    }


    function intersectObject( object, raycaster, intersects, recursive ) {


        if ( object.layers.test( raycaster.layers ) ) {


            object.raycast( raycaster, intersects );


        }


        if ( recursive === true ) {


            const children = object.children;


            for ( let i = 0, l = children.length; i < l; i ++ ) {


                intersectObject( children[ i ], raycaster, intersects, true );


            }


        }


    }


    class Spherical {


        constructor( radius = 1, phi = 0, theta = 0 ) {


            this.radius = radius;

            this.phi = phi; // polar angle

            this.theta = theta; // azimuthal angle


            return this;


        }


        set( radius, phi, theta ) {


            this.radius = radius;

            this.phi = phi;

            this.theta = theta;


            return this;


        }


        copy( other ) {


            this.radius = other.radius;

            this.phi = other.phi;

            this.theta = other.theta;


            return this;


        }


        // restrict phi to be between EPS and PI-EPS

        makeSafe() {


            const EPS = 0.000001;

            this.phi = Math.max( EPS, Math.min( Math.PI - EPS, this.phi ) );


            return this;


        }


        setFromVector3( v ) {


            return this.setFromCartesianCoords( v.x, v.y, v.z );


        }


        setFromCartesianCoords( x, y, z ) {


            this.radius = Math.sqrt( x * x + y * y + z * z );


            if ( this.radius === 0 ) {


                this.theta = 0;

                this.phi = 0;


            } else {


                this.theta = Math.atan2( x, z );

                this.phi = Math.acos( clamp( y / this.radius, - 1, 1 ) );


            }


            return this;


        }


        clone() {


            return new this.constructor().copy( this );


        }


    }


    class Cylindrical {


        constructor( radius = 1, theta = 0, y = 0 ) {


            this.radius = radius; // distance from the origin to a point in the x-z plane

            this.theta = theta; // counterclockwise angle in the x-z plane measured in radians from the positive z-axis

            this.y = y; // height above the x-z plane


            return this;


        }


        set( radius, theta, y ) {


            this.radius = radius;

            this.theta = theta;

            this.y = y;


            return this;


        }


        copy( other ) {


            this.radius = other.radius;

            this.theta = other.theta;

            this.y = other.y;


            return this;


        }


        setFromVector3( v ) {


            return this.setFromCartesianCoords( v.x, v.y, v.z );


        }


        setFromCartesianCoords( x, y, z ) {


            this.radius = Math.sqrt( x * x + z * z );

            this.theta = Math.atan2( x, z );

            this.y = y;


            return this;


        }


        clone() {


            return new this.constructor().copy( this );


        }


    }


    const _vector$4 = /*@__PURE__*/ new Vector2();


    class Box2 {


        constructor( min = new Vector2( + Infinity, + Infinity ), max = new Vector2( - Infinity, - Infinity ) ) {


            this.isBox2 = true;


            this.min = min;

            this.max = max;


        }


        set( min, max ) {


            this.min.copy( min );

            this.max.copy( max );


            return this;


        }


        setFromPoints( points ) {


            this.makeEmpty();


            for ( let i = 0, il = points.length; i < il; i ++ ) {


                this.expandByPoint( points[ i ] );


            }


            return this;


        }


        setFromCenterAndSize( center, size ) {


            const halfSize = _vector$4.copy( size ).multiplyScalar( 0.5 );

            this.min.copy( center ).sub( halfSize );

            this.max.copy( center ).add( halfSize );


            return this;


        }


        clone() {


            return new this.constructor().copy( this );


        }


        copy( box ) {


            this.min.copy( box.min );

            this.max.copy( box.max );


            return this;


        }


        makeEmpty() {


            this.min.x = this.min.y = + Infinity;

            this.max.x = this.max.y = - Infinity;


            return this;


        }


        isEmpty() {


            // this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes


            return ( this.max.x < this.min.x ) || ( this.max.y < this.min.y );


        }


        getCenter( target ) {


            return this.isEmpty() ? target.set( 0, 0 ) : target.addVectors( this.min, this.max ).multiplyScalar( 0.5 );


        }


        getSize( target ) {


            return this.isEmpty() ? target.set( 0, 0 ) : target.subVectors( this.max, this.min );


        }


        expandByPoint( point ) {


            this.min.min( point );

            this.max.max( point );


            return this;


        }


        expandByVector( vector ) {


            this.min.sub( vector );

            this.max.add( vector );


            return this;


        }


        expandByScalar( scalar ) {


            this.min.addScalar( - scalar );

            this.max.addScalar( scalar );


            return this;


        }


        containsPoint( point ) {


            return point.x < this.min.x || point.x > this.max.x ||

                point.y < this.min.y || point.y > this.max.y ? false : true;


        }


        containsBox( box ) {


            return this.min.x <= box.min.x && box.max.x <= this.max.x &&

                this.min.y <= box.min.y && box.max.y <= this.max.y;


        }


        getParameter( point, target ) {


            // This can potentially have a divide by zero if the box

            // has a size dimension of 0.


            return target.set(

                ( point.x - this.min.x ) / ( this.max.x - this.min.x ),

                ( point.y - this.min.y ) / ( this.max.y - this.min.y )

            );


        }


        intersectsBox( box ) {


            // using 4 splitting planes to rule out intersections


            return box.max.x < this.min.x || box.min.x > this.max.x ||

                box.max.y < this.min.y || box.min.y > this.max.y ? false : true;


        }


        clampPoint( point, target ) {


            return target.copy( point ).clamp( this.min, this.max );


        }


        distanceToPoint( point ) {


            return this.clampPoint( point, _vector$4 ).distanceTo( point );


        }


        intersect( box ) {


            this.min.max( box.min );

            this.max.min( box.max );


            if ( this.isEmpty() ) this.makeEmpty();


            return this;


        }


        union( box ) {


            this.min.min( box.min );

            this.max.max( box.max );


            return this;


        }


        translate( offset ) {


            this.min.add( offset );

            this.max.add( offset );


            return this;


        }


        equals( box ) {


            return box.min.equals( this.min ) && box.max.equals( this.max );


        }


    }


    const _startP = /*@__PURE__*/ new Vector3();

    const _startEnd = /*@__PURE__*/ new Vector3();


    class Line3 {


        constructor( start = new Vector3(), end = new Vector3() ) {


            this.start = start;

            this.end = end;


        }


        set( start, end ) {


            this.start.copy( start );

            this.end.copy( end );


            return this;


        }


        copy( line ) {


            this.start.copy( line.start );

            this.end.copy( line.end );


            return this;


        }


        getCenter( target ) {


            return target.addVectors( this.start, this.end ).multiplyScalar( 0.5 );


        }


        delta( target ) {


            return target.subVectors( this.end, this.start );


        }


        distanceSq() {


            return this.start.distanceToSquared( this.end );


        }


        distance() {


            return this.start.distanceTo( this.end );


        }


        at( t, target ) {


            return this.delta( target ).multiplyScalar( t ).add( this.start );


        }


        closestPointToPointParameter( point, clampToLine ) {


            _startP.subVectors( point, this.start );

            _startEnd.subVectors( this.end, this.start );


            const startEnd2 = _startEnd.dot( _startEnd );

            const startEnd_startP = _startEnd.dot( _startP );


            let t = startEnd_startP / startEnd2;


            if ( clampToLine ) {


                t = clamp( t, 0, 1 );


            }


            return t;


        }


        closestPointToPoint( point, clampToLine, target ) {


            const t = this.closestPointToPointParameter( point, clampToLine );


            return this.delta( target ).multiplyScalar( t ).add( this.start );


        }


        applyMatrix4( matrix ) {


            this.start.applyMatrix4( matrix );

            this.end.applyMatrix4( matrix );


            return this;


        }


        equals( line ) {


            return line.start.equals( this.start ) && line.end.equals( this.end );


        }


        clone() {


            return new this.constructor().copy( this );


        }


    }


    const _vector$3 = /*@__PURE__*/ new Vector3();


    class SpotLightHelper extends Object3D {


        constructor( light, color ) {


            super();


            this.light = light;


            this.matrix = light.matrixWorld;

            this.matrixAutoUpdate = false;


            this.color = color;


            this.type = 'SpotLightHelper';


            const geometry = new BufferGeometry();


            const positions = [

                0, 0, 0,    0, 0, 1,

                0, 0, 0,    1, 0, 1,

                0, 0, 0,    - 1, 0, 1,

                0, 0, 0,    0, 1, 1,

                0, 0, 0,    0, - 1, 1

            ];


            for ( let i = 0, j = 1, l = 32; i < l; i ++, j ++ ) {


                const p1 = ( i / l ) * Math.PI * 2;

                const p2 = ( j / l ) * Math.PI * 2;


                positions.push(

                    Math.cos( p1 ), Math.sin( p1 ), 1,

                    Math.cos( p2 ), Math.sin( p2 ), 1

                );


            }


            geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );


            const material = new LineBasicMaterial( { fog: false, toneMapped: false } );


            this.cone = new LineSegments( geometry, material );

            this.add( this.cone );


            this.update();


        }


        dispose() {


            this.cone.geometry.dispose();

            this.cone.material.dispose();


        }


        update() {


            this.light.updateWorldMatrix( true, false );

            this.light.target.updateWorldMatrix( true, false );


            const coneLength = this.light.distance ? this.light.distance : 1000;

            const coneWidth = coneLength * Math.tan( this.light.angle );


            this.cone.scale.set( coneWidth, coneWidth, coneLength );


            _vector$3.setFromMatrixPosition( this.light.target.matrixWorld );


            this.cone.lookAt( _vector$3 );


            if ( this.color !== undefined ) {


                this.cone.material.color.set( this.color );


            } else {


                this.cone.material.color.copy( this.light.color );


            }


        }


    }


    const _vector$2 = /*@__PURE__*/ new Vector3();

    const _boneMatrix = /*@__PURE__*/ new Matrix4();

    const _matrixWorldInv = /*@__PURE__*/ new Matrix4();


    class SkeletonHelper extends LineSegments {


        constructor( object ) {


            const bones = getBoneList( object );


            const geometry = new BufferGeometry();


            const vertices = [];

            const colors = [];


            const color1 = new Color( 0, 0, 1 );

            const color2 = new Color( 0, 1, 0 );


            for ( let i = 0; i < bones.length; i ++ ) {


                const bone = bones[ i ];


                if ( bone.parent && bone.parent.isBone ) {


                    vertices.push( 0, 0, 0 );

                    vertices.push( 0, 0, 0 );

                    colors.push( color1.r, color1.g, color1.b );

                    colors.push( color2.r, color2.g, color2.b );


                }


            }


            geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );


            const material = new LineBasicMaterial( { vertexColors: true, depthTest: false, depthWrite: false, toneMapped: false, transparent: true } );


            super( geometry, material );


            this.isSkeletonHelper = true;


            this.type = 'SkeletonHelper';


            this.root = object;

            this.bones = bones;


            this.matrix = object.matrixWorld;

            this.matrixAutoUpdate = false;


        }


        updateMatrixWorld( force ) {


            const bones = this.bones;


            const geometry = this.geometry;

            const position = geometry.getAttribute( 'position' );


            _matrixWorldInv.copy( this.root.matrixWorld ).invert();


            for ( let i = 0, j = 0; i < bones.length; i ++ ) {


                const bone = bones[ i ];


                if ( bone.parent && bone.parent.isBone ) {


                    _boneMatrix.multiplyMatrices( _matrixWorldInv, bone.matrixWorld );

                    _vector$2.setFromMatrixPosition( _boneMatrix );

                    position.setXYZ( j, _vector$2.x, _vector$2.y, _vector$2.z );


                    _boneMatrix.multiplyMatrices( _matrixWorldInv, bone.parent.matrixWorld );

                    _vector$2.setFromMatrixPosition( _boneMatrix );

                    position.setXYZ( j + 1, _vector$2.x, _vector$2.y, _vector$2.z );


                    j += 2;


                }


            }


            geometry.getAttribute( 'position' ).needsUpdate = true;


            super.updateMatrixWorld( force );


        }


        dispose() {


            this.geometry.dispose();

            this.material.dispose();


        }


    }


    function getBoneList( object ) {


        const boneList = [];


        if ( object.isBone === true ) {


            boneList.push( object );


        }


        for ( let i = 0; i < object.children.length; i ++ ) {


            boneList.push.apply( boneList, getBoneList( object.children[ i ] ) );


        }


        return boneList;


    }


    class PointLightHelper extends Mesh {


        constructor( light, sphereSize, color ) {


            const geometry = new SphereGeometry( sphereSize, 4, 2 );

            const material = new MeshBasicMaterial( { wireframe: true, fog: false, toneMapped: false } );


            super( geometry, material );


            this.light = light;


            this.color = color;


            this.type = 'PointLightHelper';


            this.matrix = this.light.matrixWorld;

            this.matrixAutoUpdate = false;


            this.update();


            /*

        // TODO: delete this comment?

        const distanceGeometry = new THREE.IcosahedronGeometry( 1, 2 );

        const distanceMaterial = new THREE.MeshBasicMaterial( { color: hexColor, fog: false, wireframe: true, opacity: 0.1, transparent: true } );


        this.lightSphere = new THREE.Mesh( bulbGeometry, bulbMaterial );

        this.lightDistance = new THREE.Mesh( distanceGeometry, distanceMaterial );


        const d = light.distance;


        if ( d === 0.0 ) {


            this.lightDistance.visible = false;


        } else {


            this.lightDistance.scale.set( d, d, d );


        }


        this.add( this.lightDistance );

        */


        }


        dispose() {


            this.geometry.dispose();

            this.material.dispose();


        }


        update() {


            this.light.updateWorldMatrix( true, false );


            if ( this.color !== undefined ) {


                this.material.color.set( this.color );


            } else {


                this.material.color.copy( this.light.color );


            }


            /*

            const d = this.light.distance;


            if ( d === 0.0 ) {


                this.lightDistance.visible = false;


            } else {


                this.lightDistance.visible = true;

                this.lightDistance.scale.set( d, d, d );


            }

            */


        }


    }


    const _vector$1 = /*@__PURE__*/ new Vector3();

    const _color1 = /*@__PURE__*/ new Color();

    const _color2 = /*@__PURE__*/ new Color();


    class HemisphereLightHelper extends Object3D {


        constructor( light, size, color ) {


            super();


            this.light = light;


            this.matrix = light.matrixWorld;

            this.matrixAutoUpdate = false;


            this.color = color;


            this.type = 'HemisphereLightHelper';


            const geometry = new OctahedronGeometry( size );

            geometry.rotateY( Math.PI * 0.5 );


            this.material = new MeshBasicMaterial( { wireframe: true, fog: false, toneMapped: false } );

            if ( this.color === undefined ) this.material.vertexColors = true;


            const position = geometry.getAttribute( 'position' );

            const colors = new Float32Array( position.count * 3 );


            geometry.setAttribute( 'color', new BufferAttribute( colors, 3 ) );


            this.add( new Mesh( geometry, this.material ) );


            this.update();


        }


        dispose() {


            this.children[ 0 ].geometry.dispose();

            this.children[ 0 ].material.dispose();


        }


        update() {


            const mesh = this.children[ 0 ];


            if ( this.color !== undefined ) {


                this.material.color.set( this.color );


            } else {


                const colors = mesh.geometry.getAttribute( 'color' );


                _color1.copy( this.light.color );

                _color2.copy( this.light.groundColor );


                for ( let i = 0, l = colors.count; i < l; i ++ ) {


                    const color = ( i < ( l / 2 ) ) ? _color1 : _color2;


                    colors.setXYZ( i, color.r, color.g, color.b );


                }


                colors.needsUpdate = true;


            }


            this.light.updateWorldMatrix( true, false );


            mesh.lookAt( _vector$1.setFromMatrixPosition( this.light.matrixWorld ).negate() );


        }


    }


    class GridHelper extends LineSegments {


        constructor( size = 10, divisions = 10, color1 = 0x444444, color2 = 0x888888 ) {


            color1 = new Color( color1 );

            color2 = new Color( color2 );


            const center = divisions / 2;

            const step = size / divisions;

            const halfSize = size / 2;


            const vertices = [], colors = [];


            for ( let i = 0, j = 0, k = - halfSize; i <= divisions; i ++, k += step ) {


                vertices.push( - halfSize, 0, k, halfSize, 0, k );

                vertices.push( k, 0, - halfSize, k, 0, halfSize );


                const color = i === center ? color1 : color2;


                color.toArray( colors, j ); j += 3;

                color.toArray( colors, j ); j += 3;

                color.toArray( colors, j ); j += 3;

                color.toArray( colors, j ); j += 3;


            }


            const geometry = new BufferGeometry();

            geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );


            const material = new LineBasicMaterial( { vertexColors: true, toneMapped: false } );


            super( geometry, material );


            this.type = 'GridHelper';


        }


        dispose() {


            this.geometry.dispose();

            this.material.dispose();


        }


    }


    class PolarGridHelper extends LineSegments {


        constructor( radius = 10, sectors = 16, rings = 8, divisions = 64, color1 = 0x444444, color2 = 0x888888 ) {


            color1 = new Color( color1 );

            color2 = new Color( color2 );


            const vertices = [];

            const colors = [];


            // create the sectors


            if ( sectors > 1 ) {


                for ( let i = 0; i < sectors; i ++ ) {


                    const v = ( i / sectors ) * ( Math.PI * 2 );


                    const x = Math.sin( v ) * radius;

                    const z = Math.cos( v ) * radius;


                    vertices.push( 0, 0, 0 );

                    vertices.push( x, 0, z );


                    const color = ( i & 1 ) ? color1 : color2;


                    colors.push( color.r, color.g, color.b );

                    colors.push( color.r, color.g, color.b );


                }


            }


            // create the rings


            for ( let i = 0; i < rings; i ++ ) {


                const color = ( i & 1 ) ? color1 : color2;


                const r = radius - ( radius / rings * i );


                for ( let j = 0; j < divisions; j ++ ) {


                    // first vertex


                    let v = ( j / divisions ) * ( Math.PI * 2 );


                    let x = Math.sin( v ) * r;

                    let z = Math.cos( v ) * r;


                    vertices.push( x, 0, z );

                    colors.push( color.r, color.g, color.b );


                    // second vertex


                    v = ( ( j + 1 ) / divisions ) * ( Math.PI * 2 );


                    x = Math.sin( v ) * r;

                    z = Math.cos( v ) * r;


                    vertices.push( x, 0, z );

                    colors.push( color.r, color.g, color.b );


                }


            }


            const geometry = new BufferGeometry();

            geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );


            const material = new LineBasicMaterial( { vertexColors: true, toneMapped: false } );


            super( geometry, material );


            this.type = 'PolarGridHelper';


        }


        dispose() {


            this.geometry.dispose();

            this.material.dispose();


        }


    }


    const _v1 = /*@__PURE__*/ new Vector3();

    const _v2 = /*@__PURE__*/ new Vector3();

    const _v3 = /*@__PURE__*/ new Vector3();


    class DirectionalLightHelper extends Object3D {


        constructor( light, size, color ) {


            super();


            this.light = light;


            this.matrix = light.matrixWorld;

            this.matrixAutoUpdate = false;


            this.color = color;


            this.type = 'DirectionalLightHelper';


            if ( size === undefined ) size = 1;


            let geometry = new BufferGeometry();

            geometry.setAttribute( 'position', new Float32BufferAttribute( [

                - size, size, 0,

                size, size, 0,

                size, - size, 0,

                - size, - size, 0,

                - size, size, 0

            ], 3 ) );


            const material = new LineBasicMaterial( { fog: false, toneMapped: false } );


            this.lightPlane = new Line( geometry, material );

            this.add( this.lightPlane );


            geometry = new BufferGeometry();

            geometry.setAttribute( 'position', new Float32BufferAttribute( [ 0, 0, 0, 0, 0, 1 ], 3 ) );


            this.targetLine = new Line( geometry, material );

            this.add( this.targetLine );


            this.update();


        }


        dispose() {


            this.lightPlane.geometry.dispose();

            this.lightPlane.material.dispose();

            this.targetLine.geometry.dispose();

            this.targetLine.material.dispose();


        }


        update() {


            this.light.updateWorldMatrix( true, false );

            this.light.target.updateWorldMatrix( true, false );


            _v1.setFromMatrixPosition( this.light.matrixWorld );

            _v2.setFromMatrixPosition( this.light.target.matrixWorld );

            _v3.subVectors( _v2, _v1 );


            this.lightPlane.lookAt( _v2 );


            if ( this.color !== undefined ) {


                this.lightPlane.material.color.set( this.color );

                this.targetLine.material.color.set( this.color );


            } else {


                this.lightPlane.material.color.copy( this.light.color );

                this.targetLine.material.color.copy( this.light.color );


            }


            this.targetLine.lookAt( _v2 );

            this.targetLine.scale.z = _v3.length();


        }


    }


    const _vector = /*@__PURE__*/ new Vector3();

    const _camera = /*@__PURE__*/ new Camera();


    class CameraHelper extends LineSegments {


        constructor( camera ) {


            const geometry = new BufferGeometry();

            const material = new LineBasicMaterial( { color: 0xffffff, vertexColors: true, toneMapped: false } );


            const vertices = [];

            const colors = [];


            const pointMap = {};


            // near


            addLine( 'n1', 'n2' );

            addLine( 'n2', 'n4' );

            addLine( 'n4', 'n3' );

            addLine( 'n3', 'n1' );


            // far


            addLine( 'f1', 'f2' );

            addLine( 'f2', 'f4' );

            addLine( 'f4', 'f3' );

            addLine( 'f3', 'f1' );


            // sides


            addLine( 'n1', 'f1' );

            addLine( 'n2', 'f2' );

            addLine( 'n3', 'f3' );

            addLine( 'n4', 'f4' );


            // cone


            addLine( 'p', 'n1' );

            addLine( 'p', 'n2' );

            addLine( 'p', 'n3' );

            addLine( 'p', 'n4' );


            // up


            addLine( 'u1', 'u2' );

            addLine( 'u2', 'u3' );

            addLine( 'u3', 'u1' );


            // target


            addLine( 'c', 't' );

            addLine( 'p', 'c' );


            // cross


            addLine( 'cn1', 'cn2' );

            addLine( 'cn3', 'cn4' );


            addLine( 'cf1', 'cf2' );

            addLine( 'cf3', 'cf4' );


            function addLine( a, b ) {


                addPoint( a );

                addPoint( b );


            }


            function addPoint( id ) {


                vertices.push( 0, 0, 0 );

                colors.push( 0, 0, 0 );


                if ( pointMap[ id ] === undefined ) {


                    pointMap[ id ] = [];


                }


                pointMap[ id ].push( ( vertices.length / 3 ) - 1 );


            }


            geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );


            super( geometry, material );


            this.type = 'CameraHelper';


            this.camera = camera;

            if ( this.camera.updateProjectionMatrix ) this.camera.updateProjectionMatrix();


            this.matrix = camera.matrixWorld;

            this.matrixAutoUpdate = false;


            this.pointMap = pointMap;


            this.update();


            // colors


            const colorFrustum = new Color( 0xffaa00 );

            const colorCone = new Color( 0xff0000 );

            const colorUp = new Color( 0x00aaff );

            const colorTarget = new Color( 0xffffff );

            const colorCross = new Color( 0x333333 );


            this.setColors( colorFrustum, colorCone, colorUp, colorTarget, colorCross );


        }


        setColors( frustum, cone, up, target, cross ) {


            const geometry = this.geometry;


            const colorAttribute = geometry.getAttribute( 'color' );


            // near


            colorAttribute.setXYZ( 0, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 1, frustum.r, frustum.g, frustum.b ); // n1, n2

            colorAttribute.setXYZ( 2, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 3, frustum.r, frustum.g, frustum.b ); // n2, n4

            colorAttribute.setXYZ( 4, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 5, frustum.r, frustum.g, frustum.b ); // n4, n3

            colorAttribute.setXYZ( 6, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 7, frustum.r, frustum.g, frustum.b ); // n3, n1


            // far


            colorAttribute.setXYZ( 8, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 9, frustum.r, frustum.g, frustum.b ); // f1, f2

            colorAttribute.setXYZ( 10, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 11, frustum.r, frustum.g, frustum.b ); // f2, f4

            colorAttribute.setXYZ( 12, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 13, frustum.r, frustum.g, frustum.b ); // f4, f3

            colorAttribute.setXYZ( 14, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 15, frustum.r, frustum.g, frustum.b ); // f3, f1


            // sides


            colorAttribute.setXYZ( 16, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 17, frustum.r, frustum.g, frustum.b ); // n1, f1

            colorAttribute.setXYZ( 18, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 19, frustum.r, frustum.g, frustum.b ); // n2, f2

            colorAttribute.setXYZ( 20, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 21, frustum.r, frustum.g, frustum.b ); // n3, f3

            colorAttribute.setXYZ( 22, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 23, frustum.r, frustum.g, frustum.b ); // n4, f4


            // cone


            colorAttribute.setXYZ( 24, cone.r, cone.g, cone.b ); colorAttribute.setXYZ( 25, cone.r, cone.g, cone.b ); // p, n1

            colorAttribute.setXYZ( 26, cone.r, cone.g, cone.b ); colorAttribute.setXYZ( 27, cone.r, cone.g, cone.b ); // p, n2

            colorAttribute.setXYZ( 28, cone.r, cone.g, cone.b ); colorAttribute.setXYZ( 29, cone.r, cone.g, cone.b ); // p, n3

            colorAttribute.setXYZ( 30, cone.r, cone.g, cone.b ); colorAttribute.setXYZ( 31, cone.r, cone.g, cone.b ); // p, n4


            // up


            colorAttribute.setXYZ( 32, up.r, up.g, up.b ); colorAttribute.setXYZ( 33, up.r, up.g, up.b ); // u1, u2

            colorAttribute.setXYZ( 34, up.r, up.g, up.b ); colorAttribute.setXYZ( 35, up.r, up.g, up.b ); // u2, u3

            colorAttribute.setXYZ( 36, up.r, up.g, up.b ); colorAttribute.setXYZ( 37, up.r, up.g, up.b ); // u3, u1


            // target


            colorAttribute.setXYZ( 38, target.r, target.g, target.b ); colorAttribute.setXYZ( 39, target.r, target.g, target.b ); // c, t

            colorAttribute.setXYZ( 40, cross.r, cross.g, cross.b ); colorAttribute.setXYZ( 41, cross.r, cross.g, cross.b ); // p, c


            // cross


            colorAttribute.setXYZ( 42, cross.r, cross.g, cross.b ); colorAttribute.setXYZ( 43, cross.r, cross.g, cross.b ); // cn1, cn2

            colorAttribute.setXYZ( 44, cross.r, cross.g, cross.b ); colorAttribute.setXYZ( 45, cross.r, cross.g, cross.b ); // cn3, cn4


            colorAttribute.setXYZ( 46, cross.r, cross.g, cross.b ); colorAttribute.setXYZ( 47, cross.r, cross.g, cross.b ); // cf1, cf2

            colorAttribute.setXYZ( 48, cross.r, cross.g, cross.b ); colorAttribute.setXYZ( 49, cross.r, cross.g, cross.b ); // cf3, cf4


            colorAttribute.needsUpdate = true;


        }


        update() {


            const geometry = this.geometry;

            const pointMap = this.pointMap;


            const w = 1, h = 1;


            // we need just camera projection matrix inverse

            // world matrix must be identity


            _camera.projectionMatrixInverse.copy( this.camera.projectionMatrixInverse );


            // center / target


            setPoint( 'c', pointMap, geometry, _camera, 0, 0, - 1 );

            setPoint( 't', pointMap, geometry, _camera, 0, 0, 1 );


            // near


            setPoint( 'n1', pointMap, geometry, _camera, - w, - h, - 1 );

            setPoint( 'n2', pointMap, geometry, _camera, w, - h, - 1 );

            setPoint( 'n3', pointMap, geometry, _camera, - w, h, - 1 );

            setPoint( 'n4', pointMap, geometry, _camera, w, h, - 1 );


            // far


            setPoint( 'f1', pointMap, geometry, _camera, - w, - h, 1 );

            setPoint( 'f2', pointMap, geometry, _camera, w, - h, 1 );

            setPoint( 'f3', pointMap, geometry, _camera, - w, h, 1 );

            setPoint( 'f4', pointMap, geometry, _camera, w, h, 1 );


            // up


            setPoint( 'u1', pointMap, geometry, _camera, w * 0.7, h * 1.1, - 1 );

            setPoint( 'u2', pointMap, geometry, _camera, - w * 0.7, h * 1.1, - 1 );

            setPoint( 'u3', pointMap, geometry, _camera, 0, h * 2, - 1 );


            // cross


            setPoint( 'cf1', pointMap, geometry, _camera, - w, 0, 1 );

            setPoint( 'cf2', pointMap, geometry, _camera, w, 0, 1 );

            setPoint( 'cf3', pointMap, geometry, _camera, 0, - h, 1 );

            setPoint( 'cf4', pointMap, geometry, _camera, 0, h, 1 );


            setPoint( 'cn1', pointMap, geometry, _camera, - w, 0, - 1 );

            setPoint( 'cn2', pointMap, geometry, _camera, w, 0, - 1 );

            setPoint( 'cn3', pointMap, geometry, _camera, 0, - h, - 1 );

            setPoint( 'cn4', pointMap, geometry, _camera, 0, h, - 1 );


            geometry.getAttribute( 'position' ).needsUpdate = true;


        }


        dispose() {


            this.geometry.dispose();

            this.material.dispose();


        }


    }


    function setPoint( point, pointMap, geometry, camera, x, y, z ) {


        _vector.set( x, y, z ).unproject( camera );


        const points = pointMap[ point ];


        if ( points !== undefined ) {


            const position = geometry.getAttribute( 'position' );


            for ( let i = 0, l = points.length; i < l; i ++ ) {


                position.setXYZ( points[ i ], _vector.x, _vector.y, _vector.z );


            }


        }


    }


    const _box = /*@__PURE__*/ new Box3();


    class BoxHelper extends LineSegments {


        constructor( object, color = 0xffff00 ) {


            const indices = new Uint16Array( [ 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 ] );

            const positions = new Float32Array( 8 * 3 );


            const geometry = new BufferGeometry();

            geometry.setIndex( new BufferAttribute( indices, 1 ) );

            geometry.setAttribute( 'position', new BufferAttribute( positions, 3 ) );


            super( geometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );


            this.object = object;

            this.type = 'BoxHelper';


            this.matrixAutoUpdate = false;


            this.update();


        }


        update( object ) {


            if ( object !== undefined ) {


                console.warn( 'THREE.BoxHelper: .update() has no longer arguments.' );


            }


            if ( this.object !== undefined ) {


                _box.setFromObject( this.object );


            }


            if ( _box.isEmpty() ) return;


            const min = _box.min;

            const max = _box.max;


            /*

                5____4

            1/___0/|

            | 6__|_7

            2/___3/


            0: max.x, max.y, max.z

            1: min.x, max.y, max.z

            2: min.x, min.y, max.z

            3: max.x, min.y, max.z

            4: max.x, max.y, min.z

            5: min.x, max.y, min.z

            6: min.x, min.y, min.z

            7: max.x, min.y, min.z

            */


            const position = this.geometry.attributes.position;

            const array = position.array;


            array[ 0 ] = max.x; array[ 1 ] = max.y; array[ 2 ] = max.z;

            array[ 3 ] = min.x; array[ 4 ] = max.y; array[ 5 ] = max.z;

            array[ 6 ] = min.x; array[ 7 ] = min.y; array[ 8 ] = max.z;

            array[ 9 ] = max.x; array[ 10 ] = min.y; array[ 11 ] = max.z;

            array[ 12 ] = max.x; array[ 13 ] = max.y; array[ 14 ] = min.z;

            array[ 15 ] = min.x; array[ 16 ] = max.y; array[ 17 ] = min.z;

            array[ 18 ] = min.x; array[ 19 ] = min.y; array[ 20 ] = min.z;

            array[ 21 ] = max.x; array[ 22 ] = min.y; array[ 23 ] = min.z;


            position.needsUpdate = true;


            this.geometry.computeBoundingSphere();


        }


        setFromObject( object ) {


            this.object = object;

            this.update();


            return this;


        }


        copy( source, recursive ) {


            super.copy( source, recursive );


            this.object = source.object;


            return this;


        }


        dispose() {


            this.geometry.dispose();

            this.material.dispose();


        }


    }


    class Box3Helper extends LineSegments {


        constructor( box, color = 0xffff00 ) {


            const indices = new Uint16Array( [ 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 ] );


            const positions = [ 1, 1, 1, - 1, 1, 1, - 1, - 1, 1, 1, - 1, 1, 1, 1, - 1, - 1, 1, - 1, - 1, - 1, - 1, 1, - 1, - 1 ];


            const geometry = new BufferGeometry();


            geometry.setIndex( new BufferAttribute( indices, 1 ) );


            geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );


            super( geometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );


            this.box = box;


            this.type = 'Box3Helper';


            this.geometry.computeBoundingSphere();


        }


        updateMatrixWorld( force ) {


            const box = this.box;


            if ( box.isEmpty() ) return;


            box.getCenter( this.position );


            box.getSize( this.scale );


            this.scale.multiplyScalar( 0.5 );


            super.updateMatrixWorld( force );


        }


        dispose() {


            this.geometry.dispose();

            this.material.dispose();


        }


    }


    class PlaneHelper extends Line {


        constructor( plane, size = 1, hex = 0xffff00 ) {


            const color = hex;


            const positions = [ 1, - 1, 0, - 1, 1, 0, - 1, - 1, 0, 1, 1, 0, - 1, 1, 0, - 1, - 1, 0, 1, - 1, 0, 1, 1, 0 ];


            const geometry = new BufferGeometry();

            geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );

            geometry.computeBoundingSphere();


            super( geometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );


            this.type = 'PlaneHelper';


            this.plane = plane;


            this.size = size;


            const positions2 = [ 1, 1, 0, - 1, 1, 0, - 1, - 1, 0, 1, 1, 0, - 1, - 1, 0, 1, - 1, 0 ];


            const geometry2 = new BufferGeometry();

            geometry2.setAttribute( 'position', new Float32BufferAttribute( positions2, 3 ) );

            geometry2.computeBoundingSphere();


            this.add( new Mesh( geometry2, new MeshBasicMaterial( { color: color, opacity: 0.2, transparent: true, depthWrite: false, toneMapped: false } ) ) );


        }


        updateMatrixWorld( force ) {


            this.position.set( 0, 0, 0 );


            this.scale.set( 0.5 * this.size, 0.5 * this.size, 1 );


            this.lookAt( this.plane.normal );


            this.translateZ( - this.plane.constant );


            super.updateMatrixWorld( force );


        }


        dispose() {


            this.geometry.dispose();

            this.material.dispose();

            this.children[ 0 ].geometry.dispose();

            this.children[ 0 ].material.dispose();


        }


    }


    const _axis = /*@__PURE__*/ new Vector3();

    let _lineGeometry, _coneGeometry;


    class ArrowHelper extends Object3D {


        // dir is assumed to be normalized


        constructor( dir = new Vector3( 0, 0, 1 ), origin = new Vector3( 0, 0, 0 ), length = 1, color = 0xffff00, headLength = length * 0.2, headWidth = headLength * 0.2 ) {


            super();


            this.type = 'ArrowHelper';


            if ( _lineGeometry === undefined ) {


                _lineGeometry = new BufferGeometry();

                _lineGeometry.setAttribute( 'position', new Float32BufferAttribute( [ 0, 0, 0, 0, 1, 0 ], 3 ) );


                _coneGeometry = new CylinderGeometry( 0, 0.5, 1, 5, 1 );

                _coneGeometry.translate( 0, - 0.5, 0 );


            }


            this.position.copy( origin );


            this.line = new Line( _lineGeometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );

            this.line.matrixAutoUpdate = false;

            this.add( this.line );


            this.cone = new Mesh( _coneGeometry, new MeshBasicMaterial( { color: color, toneMapped: false } ) );

            this.cone.matrixAutoUpdate = false;

            this.add( this.cone );


            this.setDirection( dir );

            this.setLength( length, headLength, headWidth );


        }


        setDirection( dir ) {


            // dir is assumed to be normalized


            if ( dir.y > 0.99999 ) {


                this.quaternion.set( 0, 0, 0, 1 );


            } else if ( dir.y < - 0.99999 ) {


                this.quaternion.set( 1, 0, 0, 0 );


            } else {


                _axis.set( dir.z, 0, - dir.x ).normalize();


                const radians = Math.acos( dir.y );


                this.quaternion.setFromAxisAngle( _axis, radians );


            }


        }


        setLength( length, headLength = length * 0.2, headWidth = headLength * 0.2 ) {


            this.line.scale.set( 1, Math.max( 0.0001, length - headLength ), 1 ); // see #17458

            this.line.updateMatrix();


            this.cone.scale.set( headWidth, headLength, headWidth );

            this.cone.position.y = length;

            this.cone.updateMatrix();


        }


        setColor( color ) {


            this.line.material.color.set( color );

            this.cone.material.color.set( color );


        }


        copy( source ) {


            super.copy( source, false );


            this.line.copy( source.line );

            this.cone.copy( source.cone );


            return this;


        }


        dispose() {


            this.line.geometry.dispose();

            this.line.material.dispose();

            this.cone.geometry.dispose();

            this.cone.material.dispose();


        }


    }


    class AxesHelper extends LineSegments {


        constructor( size = 1 ) {


            const vertices = [

                0, 0, 0,    size, 0, 0,

                0, 0, 0,    0, size, 0,

                0, 0, 0,    0, 0, size

            ];


            const colors = [

                1, 0, 0,    1, 0.6, 0,

                0, 1, 0,    0.6, 1, 0,

                0, 0, 1,    0, 0.6, 1

            ];


            const geometry = new BufferGeometry();

            geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

            geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );


            const material = new LineBasicMaterial( { vertexColors: true, toneMapped: false } );


            super( geometry, material );


            this.type = 'AxesHelper';


        }


        setColors( xAxisColor, yAxisColor, zAxisColor ) {


            const color = new Color();

            const array = this.geometry.attributes.color.array;


            color.set( xAxisColor );

            color.toArray( array, 0 );

            color.toArray( array, 3 );


            color.set( yAxisColor );

            color.toArray( array, 6 );

            color.toArray( array, 9 );


            color.set( zAxisColor );

            color.toArray( array, 12 );

            color.toArray( array, 15 );


            this.geometry.attributes.color.needsUpdate = true;


            return this;


        }


        dispose() {


            this.geometry.dispose();

            this.material.dispose();


        }


    }


    class ShapePath {


        constructor() {


            this.type = 'ShapePath';


            this.color = new Color();


            this.subPaths = [];

            this.currentPath = null;


        }


        moveTo( x, y ) {


            this.currentPath = new Path();

            this.subPaths.push( this.currentPath );

            this.currentPath.moveTo( x, y );


            return this;


        }


        lineTo( x, y ) {


            this.currentPath.lineTo( x, y );


            return this;


        }


        quadraticCurveTo( aCPx, aCPy, aX, aY ) {


            this.currentPath.quadraticCurveTo( aCPx, aCPy, aX, aY );


            return this;


        }


        bezierCurveTo( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY ) {


            this.currentPath.bezierCurveTo( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY );


            return this;


        }


        splineThru( pts ) {


            this.currentPath.splineThru( pts );


            return this;


        }


        toShapes( isCCW ) {


            function toShapesNoHoles( inSubpaths ) {


                const shapes = [];


                for ( let i = 0, l = inSubpaths.length; i < l; i ++ ) {


                    const tmpPath = inSubpaths[ i ];


                    const tmpShape = new Shape();

                    tmpShape.curves = tmpPath.curves;


                    shapes.push( tmpShape );


                }


                return shapes;


            }


            function isPointInsidePolygon( inPt, inPolygon ) {


                const polyLen = inPolygon.length;


                // inPt on polygon contour => immediate success    or

                // toggling of inside/outside at every single! intersection point of an edge

                //  with the horizontal line through inPt, left of inPt

                //  not counting lowerY endpoints of edges and whole edges on that line

                let inside = false;

                for ( let p = polyLen - 1, q = 0; q < polyLen; p = q ++ ) {


                    let edgeLowPt = inPolygon[ p ];

                    let edgeHighPt = inPolygon[ q ];


                    let edgeDx = edgeHighPt.x - edgeLowPt.x;

                    let edgeDy = edgeHighPt.y - edgeLowPt.y;


                    if ( Math.abs( edgeDy ) > Number.EPSILON ) {


                        // not parallel

                        if ( edgeDy < 0 ) {


                            edgeLowPt = inPolygon[ q ]; edgeDx = - edgeDx;

                            edgeHighPt = inPolygon[ p ]; edgeDy = - edgeDy;


                        }


                        if ( ( inPt.y < edgeLowPt.y ) || ( inPt.y > edgeHighPt.y ) )        continue;


                        if ( inPt.y === edgeLowPt.y ) {


                            if ( inPt.x === edgeLowPt.x )       return  true;       // inPt is on contour ?

                            // continue;                // no intersection or edgeLowPt => doesn't count !!!


                        } else {


                            const perpEdge = edgeDy * ( inPt.x - edgeLowPt.x ) - edgeDx * ( inPt.y - edgeLowPt.y );

                            if ( perpEdge === 0 )               return  true;       // inPt is on contour ?

                            if ( perpEdge < 0 )                 continue;

                            inside = ! inside;      // true intersection left of inPt


                        }


                    } else {


                        // parallel or collinear

                        if ( inPt.y !== edgeLowPt.y )       continue;           // parallel

                        // edge lies on the same horizontal line as inPt

                        if ( ( ( edgeHighPt.x <= inPt.x ) && ( inPt.x <= edgeLowPt.x ) ) ||

                             ( ( edgeLowPt.x <= inPt.x ) && ( inPt.x <= edgeHighPt.x ) ) )      return  true;   // inPt: Point on contour !

                        // continue;


                    }


                }


                return  inside;


            }


            const isClockWise = ShapeUtils.isClockWise;


            const subPaths = this.subPaths;

            if ( subPaths.length === 0 ) return [];


            let solid, tmpPath, tmpShape;

            const shapes = [];


            if ( subPaths.length === 1 ) {


                tmpPath = subPaths[ 0 ];

                tmpShape = new Shape();

                tmpShape.curves = tmpPath.curves;

                shapes.push( tmpShape );

                return shapes;


            }


            let holesFirst = ! isClockWise( subPaths[ 0 ].getPoints() );

            holesFirst = isCCW ? ! holesFirst : holesFirst;


            // console.log("Holes first", holesFirst);


            const betterShapeHoles = [];

            const newShapes = [];

            let newShapeHoles = [];

            let mainIdx = 0;

            let tmpPoints;


            newShapes[ mainIdx ] = undefined;

            newShapeHoles[ mainIdx ] = [];


            for ( let i = 0, l = subPaths.length; i < l; i ++ ) {


                tmpPath = subPaths[ i ];

                tmpPoints = tmpPath.getPoints();

                solid = isClockWise( tmpPoints );

                solid = isCCW ? ! solid : solid;


                if ( solid ) {


                    if ( ( ! holesFirst ) && ( newShapes[ mainIdx ] ) ) mainIdx ++;


                    newShapes[ mainIdx ] = { s: new Shape(), p: tmpPoints };

                    newShapes[ mainIdx ].s.curves = tmpPath.curves;


                    if ( holesFirst )   mainIdx ++;

                    newShapeHoles[ mainIdx ] = [];


                    //console.log('cw', i);


                } else {


                    newShapeHoles[ mainIdx ].push( { h: tmpPath, p: tmpPoints[ 0 ] } );


                    //console.log('ccw', i);


                }


            }


            // only Holes? -> probably all Shapes with wrong orientation

            if ( ! newShapes[ 0 ] ) return  toShapesNoHoles( subPaths );


            if ( newShapes.length > 1 ) {


                let ambiguous = false;

                let toChange = 0;


                for ( let sIdx = 0, sLen = newShapes.length; sIdx < sLen; sIdx ++ ) {


                    betterShapeHoles[ sIdx ] = [];


                }


                for ( let sIdx = 0, sLen = newShapes.length; sIdx < sLen; sIdx ++ ) {


                    const sho = newShapeHoles[ sIdx ];


                    for ( let hIdx = 0; hIdx < sho.length; hIdx ++ ) {


                        const ho = sho[ hIdx ];

                        let hole_unassigned = true;


                        for ( let s2Idx = 0; s2Idx < newShapes.length; s2Idx ++ ) {


                            if ( isPointInsidePolygon( ho.p, newShapes[ s2Idx ].p ) ) {


                                if ( sIdx !== s2Idx )   toChange ++;


                                if ( hole_unassigned ) {


                                    hole_unassigned = false;

                                    betterShapeHoles[ s2Idx ].push( ho );


                                } else {


                                    ambiguous = true;


                                }


                            }


                        }


                        if ( hole_unassigned ) {


                            betterShapeHoles[ sIdx ].push( ho );


                        }


                    }


                }


                if ( toChange > 0 && ambiguous === false ) {


                    newShapeHoles = betterShapeHoles;


                }


            }


            let tmpHoles;


            for ( let i = 0, il = newShapes.length; i < il; i ++ ) {


                tmpShape = newShapes[ i ].s;

                shapes.push( tmpShape );

                tmpHoles = newShapeHoles[ i ];


                for ( let j = 0, jl = tmpHoles.length; j < jl; j ++ ) {


                    tmpShape.holes.push( tmpHoles[ j ].h );


                }


            }


            //console.log("shape", shapes);


            return shapes;


        }


    }


    if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {


        __THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'register', { detail: {

            revision: REVISION,

        } } ) );


    }


    if ( typeof window !== 'undefined' ) {


        if ( window.__THREE__ ) {


            console.warn( 'WARNING: Multiple instances of Three.js being imported.' );


        } else {


            window.__THREE__ = REVISION;


        }


    }


    exports.ACESFilmicToneMapping = ACESFilmicToneMapping;

    exports.AddEquation = AddEquation;

    exports.AddOperation = AddOperation;

    exports.AdditiveAnimationBlendMode = AdditiveAnimationBlendMode;

    exports.AdditiveBlending = AdditiveBlending;

    exports.AgXToneMapping = AgXToneMapping;

    exports.AlphaFormat = AlphaFormat;

    exports.AlwaysCompare = AlwaysCompare;

    exports.AlwaysDepth = AlwaysDepth;

    exports.AlwaysStencilFunc = AlwaysStencilFunc;

    exports.AmbientLight = AmbientLight;

    exports.AnimationAction = AnimationAction;

    exports.AnimationClip = AnimationClip;

    exports.AnimationLoader = AnimationLoader;

    exports.AnimationMixer = AnimationMixer;

    exports.AnimationObjectGroup = AnimationObjectGroup;

    exports.AnimationUtils = AnimationUtils;

    exports.ArcCurve = ArcCurve;

    exports.ArrayCamera = ArrayCamera;

    exports.ArrowHelper = ArrowHelper;

    exports.AttachedBindMode = AttachedBindMode;

    exports.Audio = Audio;

    exports.AudioAnalyser = AudioAnalyser;

    exports.AudioContext = AudioContext;

    exports.AudioListener = AudioListener;

    exports.AudioLoader = AudioLoader;

    exports.AxesHelper = AxesHelper;

    exports.BackSide = BackSide;

    exports.BasicDepthPacking = BasicDepthPacking;

    exports.BasicShadowMap = BasicShadowMap;

    exports.BatchedMesh = BatchedMesh;

    exports.Bone = Bone;

    exports.BooleanKeyframeTrack = BooleanKeyframeTrack;

    exports.Box2 = Box2;

    exports.Box3 = Box3;

    exports.Box3Helper = Box3Helper;

    exports.BoxGeometry = BoxGeometry;

    exports.BoxHelper = BoxHelper;

    exports.BufferAttribute = BufferAttribute;

    exports.BufferGeometry = BufferGeometry;

    exports.BufferGeometryLoader = BufferGeometryLoader;

    exports.ByteType = ByteType;

    exports.Cache = Cache;

    exports.Camera = Camera;

    exports.CameraHelper = CameraHelper;

    exports.CanvasTexture = CanvasTexture;

    exports.CapsuleGeometry = CapsuleGeometry;

    exports.CatmullRomCurve3 = CatmullRomCurve3;

    exports.CineonToneMapping = CineonToneMapping;

    exports.CircleGeometry = CircleGeometry;

    exports.ClampToEdgeWrapping = ClampToEdgeWrapping;

    exports.Clock = Clock;

    exports.Color = Color;

    exports.ColorKeyframeTrack = ColorKeyframeTrack;

    exports.ColorManagement = ColorManagement;

    exports.CompressedArrayTexture = CompressedArrayTexture;

    exports.CompressedCubeTexture = CompressedCubeTexture;

    exports.CompressedTexture = CompressedTexture;

    exports.CompressedTextureLoader = CompressedTextureLoader;

    exports.ConeGeometry = ConeGeometry;

    exports.ConstantAlphaFactor = ConstantAlphaFactor;

    exports.ConstantColorFactor = ConstantColorFactor;

    exports.CubeCamera = CubeCamera;

    exports.CubeReflectionMapping = CubeReflectionMapping;

    exports.CubeRefractionMapping = CubeRefractionMapping;

    exports.CubeTexture = CubeTexture;

    exports.CubeTextureLoader = CubeTextureLoader;

    exports.CubeUVReflectionMapping = CubeUVReflectionMapping;

    exports.CubicBezierCurve = CubicBezierCurve;

    exports.CubicBezierCurve3 = CubicBezierCurve3;

    exports.CubicInterpolant = CubicInterpolant;

    exports.CullFaceBack = CullFaceBack;

    exports.CullFaceFront = CullFaceFront;

    exports.CullFaceFrontBack = CullFaceFrontBack;

    exports.CullFaceNone = CullFaceNone;

    exports.Curve = Curve;

    exports.CurvePath = CurvePath;

    exports.CustomBlending = CustomBlending;

    exports.CustomToneMapping = CustomToneMapping;

    exports.CylinderGeometry = CylinderGeometry;

    exports.Cylindrical = Cylindrical;

    exports.Data3DTexture = Data3DTexture;

    exports.DataArrayTexture = DataArrayTexture;

    exports.DataTexture = DataTexture;

    exports.DataTextureLoader = DataTextureLoader;

    exports.DataUtils = DataUtils;

    exports.DecrementStencilOp = DecrementStencilOp;

    exports.DecrementWrapStencilOp = DecrementWrapStencilOp;

    exports.DefaultLoadingManager = DefaultLoadingManager;

    exports.DepthFormat = DepthFormat;

    exports.DepthStencilFormat = DepthStencilFormat;

    exports.DepthTexture = DepthTexture;

    exports.DetachedBindMode = DetachedBindMode;

    exports.DirectionalLight = DirectionalLight;

    exports.DirectionalLightHelper = DirectionalLightHelper;

    exports.DiscreteInterpolant = DiscreteInterpolant;

    exports.DisplayP3ColorSpace = DisplayP3ColorSpace;

    exports.DodecahedronGeometry = DodecahedronGeometry;

    exports.DoubleSide = DoubleSide;

    exports.DstAlphaFactor = DstAlphaFactor;

    exports.DstColorFactor = DstColorFactor;

    exports.DynamicCopyUsage = DynamicCopyUsage;

    exports.DynamicDrawUsage = DynamicDrawUsage;

    exports.DynamicReadUsage = DynamicReadUsage;

    exports.EdgesGeometry = EdgesGeometry;

    exports.EllipseCurve = EllipseCurve;

    exports.EqualCompare = EqualCompare;

    exports.EqualDepth = EqualDepth;

    exports.EqualStencilFunc = EqualStencilFunc;

    exports.EquirectangularReflectionMapping = EquirectangularReflectionMapping;

    exports.EquirectangularRefractionMapping = EquirectangularRefractionMapping;

    exports.Euler = Euler;

    exports.EventDispatcher = EventDispatcher;

    exports.ExtrudeGeometry = ExtrudeGeometry;

    exports.FileLoader = FileLoader;

    exports.Float16BufferAttribute = Float16BufferAttribute;

    exports.Float32BufferAttribute = Float32BufferAttribute;

    exports.Float64BufferAttribute = Float64BufferAttribute;

    exports.FloatType = FloatType;

    exports.Fog = Fog;

    exports.FogExp2 = FogExp2;

    exports.FramebufferTexture = FramebufferTexture;

    exports.FrontSide = FrontSide;

    exports.Frustum = Frustum;

    exports.GLBufferAttribute = GLBufferAttribute;

    exports.GLSL1 = GLSL1;

    exports.GLSL3 = GLSL3;

    exports.GreaterCompare = GreaterCompare;

    exports.GreaterDepth = GreaterDepth;

    exports.GreaterEqualCompare = GreaterEqualCompare;

    exports.GreaterEqualDepth = GreaterEqualDepth;

    exports.GreaterEqualStencilFunc = GreaterEqualStencilFunc;

    exports.GreaterStencilFunc = GreaterStencilFunc;

    exports.GridHelper = GridHelper;

    exports.Group = Group;

    exports.HalfFloatType = HalfFloatType;

    exports.HemisphereLight = HemisphereLight;

    exports.HemisphereLightHelper = HemisphereLightHelper;

    exports.IcosahedronGeometry = IcosahedronGeometry;

    exports.ImageBitmapLoader = ImageBitmapLoader;

    exports.ImageLoader = ImageLoader;

    exports.ImageUtils = ImageUtils;

    exports.IncrementStencilOp = IncrementStencilOp;

    exports.IncrementWrapStencilOp = IncrementWrapStencilOp;

    exports.InstancedBufferAttribute = InstancedBufferAttribute;

    exports.InstancedBufferGeometry = InstancedBufferGeometry;

    exports.InstancedInterleavedBuffer = InstancedInterleavedBuffer;

    exports.InstancedMesh = InstancedMesh;

    exports.Int16BufferAttribute = Int16BufferAttribute;

    exports.Int32BufferAttribute = Int32BufferAttribute;

    exports.Int8BufferAttribute = Int8BufferAttribute;

    exports.IntType = IntType;

    exports.InterleavedBuffer = InterleavedBuffer;

    exports.InterleavedBufferAttribute = InterleavedBufferAttribute;

    exports.Interpolant = Interpolant;

    exports.InterpolateDiscrete = InterpolateDiscrete;

    exports.InterpolateLinear = InterpolateLinear;

    exports.InterpolateSmooth = InterpolateSmooth;

    exports.InvertStencilOp = InvertStencilOp;

    exports.KeepStencilOp = KeepStencilOp;

    exports.KeyframeTrack = KeyframeTrack;

    exports.LOD = LOD;

    exports.LatheGeometry = LatheGeometry;

    exports.Layers = Layers;

    exports.LessCompare = LessCompare;

    exports.LessDepth = LessDepth;

    exports.LessEqualCompare = LessEqualCompare;

    exports.LessEqualDepth = LessEqualDepth;

    exports.LessEqualStencilFunc = LessEqualStencilFunc;

    exports.LessStencilFunc = LessStencilFunc;

    exports.Light = Light;

    exports.LightProbe = LightProbe;

    exports.Line = Line;

    exports.Line3 = Line3;

    exports.LineBasicMaterial = LineBasicMaterial;

    exports.LineCurve = LineCurve;

    exports.LineCurve3 = LineCurve3;

    exports.LineDashedMaterial = LineDashedMaterial;

    exports.LineLoop = LineLoop;

    exports.LineSegments = LineSegments;

    exports.LinearDisplayP3ColorSpace = LinearDisplayP3ColorSpace;

    exports.LinearEncoding = LinearEncoding;

    exports.LinearFilter = LinearFilter;

    exports.LinearInterpolant = LinearInterpolant;

    exports.LinearMipMapLinearFilter = LinearMipMapLinearFilter;

    exports.LinearMipMapNearestFilter = LinearMipMapNearestFilter;

    exports.LinearMipmapLinearFilter = LinearMipmapLinearFilter;

    exports.LinearMipmapNearestFilter = LinearMipmapNearestFilter;

    exports.LinearSRGBColorSpace = LinearSRGBColorSpace;

    exports.LinearToneMapping = LinearToneMapping;

    exports.LinearTransfer = LinearTransfer;

    exports.Loader = Loader;

    exports.LoaderUtils = LoaderUtils;

    exports.LoadingManager = LoadingManager;

    exports.LoopOnce = LoopOnce;

    exports.LoopPingPong = LoopPingPong;

    exports.LoopRepeat = LoopRepeat;

    exports.LuminanceAlphaFormat = LuminanceAlphaFormat;

    exports.LuminanceFormat = LuminanceFormat;

    exports.MOUSE = MOUSE;

    exports.Material = Material;

    exports.MaterialLoader = MaterialLoader;

    exports.MathUtils = MathUtils;

    exports.Matrix3 = Matrix3;

    exports.Matrix4 = Matrix4;

    exports.MaxEquation = MaxEquation;

    exports.Mesh = Mesh;

    exports.MeshBasicMaterial = MeshBasicMaterial;

    exports.MeshDepthMaterial = MeshDepthMaterial;

    exports.MeshDistanceMaterial = MeshDistanceMaterial;

    exports.MeshLambertMaterial = MeshLambertMaterial;

    exports.MeshMatcapMaterial = MeshMatcapMaterial;

    exports.MeshNormalMaterial = MeshNormalMaterial;

    exports.MeshPhongMaterial = MeshPhongMaterial;

    exports.MeshPhysicalMaterial = MeshPhysicalMaterial;

    exports.MeshStandardMaterial = MeshStandardMaterial;

    exports.MeshToonMaterial = MeshToonMaterial;

    exports.MinEquation = MinEquation;

    exports.MirroredRepeatWrapping = MirroredRepeatWrapping;

    exports.MixOperation = MixOperation;

    exports.MultiplyBlending = MultiplyBlending;

    exports.MultiplyOperation = MultiplyOperation;

    exports.NearestFilter = NearestFilter;

    exports.NearestMipMapLinearFilter = NearestMipMapLinearFilter;

    exports.NearestMipMapNearestFilter = NearestMipMapNearestFilter;

    exports.NearestMipmapLinearFilter = NearestMipmapLinearFilter;

    exports.NearestMipmapNearestFilter = NearestMipmapNearestFilter;

    exports.NeverCompare = NeverCompare;

    exports.NeverDepth = NeverDepth;

    exports.NeverStencilFunc = NeverStencilFunc;

    exports.NoBlending = NoBlending;

    exports.NoColorSpace = NoColorSpace;

    exports.NoToneMapping = NoToneMapping;

    exports.NormalAnimationBlendMode = NormalAnimationBlendMode;

    exports.NormalBlending = NormalBlending;

    exports.NotEqualCompare = NotEqualCompare;

    exports.NotEqualDepth = NotEqualDepth;

    exports.NotEqualStencilFunc = NotEqualStencilFunc;

    exports.NumberKeyframeTrack = NumberKeyframeTrack;

    exports.Object3D = Object3D;

    exports.ObjectLoader = ObjectLoader;

    exports.ObjectSpaceNormalMap = ObjectSpaceNormalMap;

    exports.OctahedronGeometry = OctahedronGeometry;

    exports.OneFactor = OneFactor;

    exports.OneMinusConstantAlphaFactor = OneMinusConstantAlphaFactor;

    exports.OneMinusConstantColorFactor = OneMinusConstantColorFactor;

    exports.OneMinusDstAlphaFactor = OneMinusDstAlphaFactor;

    exports.OneMinusDstColorFactor = OneMinusDstColorFactor;

    exports.OneMinusSrcAlphaFactor = OneMinusSrcAlphaFactor;

    exports.OneMinusSrcColorFactor = OneMinusSrcColorFactor;

    exports.OrthographicCamera = OrthographicCamera;

    exports.P3Primaries = P3Primaries;

    exports.PCFShadowMap = PCFShadowMap;

    exports.PCFSoftShadowMap = PCFSoftShadowMap;

    exports.PMREMGenerator = PMREMGenerator;

    exports.Path = Path;

    exports.PerspectiveCamera = PerspectiveCamera;

    exports.Plane = Plane;

    exports.PlaneGeometry = PlaneGeometry;

    exports.PlaneHelper = PlaneHelper;

    exports.PointLight = PointLight;

    exports.PointLightHelper = PointLightHelper;

    exports.Points = Points;

    exports.PointsMaterial = PointsMaterial;

    exports.PolarGridHelper = PolarGridHelper;

    exports.PolyhedronGeometry = PolyhedronGeometry;

    exports.PositionalAudio = PositionalAudio;

    exports.PropertyBinding = PropertyBinding;

    exports.PropertyMixer = PropertyMixer;

    exports.QuadraticBezierCurve = QuadraticBezierCurve;

    exports.QuadraticBezierCurve3 = QuadraticBezierCurve3;

    exports.Quaternion = Quaternion;

    exports.QuaternionKeyframeTrack = QuaternionKeyframeTrack;

    exports.QuaternionLinearInterpolant = QuaternionLinearInterpolant;

    exports.RED_GREEN_RGTC2_Format = RED_GREEN_RGTC2_Format;

    exports.RED_RGTC1_Format = RED_RGTC1_Format;

    exports.REVISION = REVISION;

    exports.RGBADepthPacking = RGBADepthPacking;

    exports.RGBAFormat = RGBAFormat;

    exports.RGBAIntegerFormat = RGBAIntegerFormat;

    exports.RGBA_ASTC_10x10_Format = RGBA_ASTC_10x10_Format;

    exports.RGBA_ASTC_10x5_Format = RGBA_ASTC_10x5_Format;

    exports.RGBA_ASTC_10x6_Format = RGBA_ASTC_10x6_Format;

    exports.RGBA_ASTC_10x8_Format = RGBA_ASTC_10x8_Format;

    exports.RGBA_ASTC_12x10_Format = RGBA_ASTC_12x10_Format;

    exports.RGBA_ASTC_12x12_Format = RGBA_ASTC_12x12_Format;

    exports.RGBA_ASTC_4x4_Format = RGBA_ASTC_4x4_Format;

    exports.RGBA_ASTC_5x4_Format = RGBA_ASTC_5x4_Format;

    exports.RGBA_ASTC_5x5_Format = RGBA_ASTC_5x5_Format;

    exports.RGBA_ASTC_6x5_Format = RGBA_ASTC_6x5_Format;

    exports.RGBA_ASTC_6x6_Format = RGBA_ASTC_6x6_Format;

    exports.RGBA_ASTC_8x5_Format = RGBA_ASTC_8x5_Format;

    exports.RGBA_ASTC_8x6_Format = RGBA_ASTC_8x6_Format;

    exports.RGBA_ASTC_8x8_Format = RGBA_ASTC_8x8_Format;

    exports.RGBA_BPTC_Format = RGBA_BPTC_Format;

    exports.RGBA_ETC2_EAC_Format = RGBA_ETC2_EAC_Format;

    exports.RGBA_PVRTC_2BPPV1_Format = RGBA_PVRTC_2BPPV1_Format;

    exports.RGBA_PVRTC_4BPPV1_Format = RGBA_PVRTC_4BPPV1_Format;

    exports.RGBA_S3TC_DXT1_Format = RGBA_S3TC_DXT1_Format;

    exports.RGBA_S3TC_DXT3_Format = RGBA_S3TC_DXT3_Format;

    exports.RGBA_S3TC_DXT5_Format = RGBA_S3TC_DXT5_Format;

    exports.RGB_BPTC_SIGNED_Format = RGB_BPTC_SIGNED_Format;

    exports.RGB_BPTC_UNSIGNED_Format = RGB_BPTC_UNSIGNED_Format;

    exports.RGB_ETC1_Format = RGB_ETC1_Format;

    exports.RGB_ETC2_Format = RGB_ETC2_Format;

    exports.RGB_PVRTC_2BPPV1_Format = RGB_PVRTC_2BPPV1_Format;

    exports.RGB_PVRTC_4BPPV1_Format = RGB_PVRTC_4BPPV1_Format;

    exports.RGB_S3TC_DXT1_Format = RGB_S3TC_DXT1_Format;

    exports.RGFormat = RGFormat;

    exports.RGIntegerFormat = RGIntegerFormat;

    exports.RawShaderMaterial = RawShaderMaterial;

    exports.Ray = Ray;

    exports.Raycaster = Raycaster;

    exports.Rec709Primaries = Rec709Primaries;

    exports.RectAreaLight = RectAreaLight;

    exports.RedFormat = RedFormat;

    exports.RedIntegerFormat = RedIntegerFormat;

    exports.ReinhardToneMapping = ReinhardToneMapping;

    exports.RenderTarget = RenderTarget;

    exports.RepeatWrapping = RepeatWrapping;

    exports.ReplaceStencilOp = ReplaceStencilOp;

    exports.ReverseSubtractEquation = ReverseSubtractEquation;

    exports.RingGeometry = RingGeometry;

    exports.SIGNED_RED_GREEN_RGTC2_Format = SIGNED_RED_GREEN_RGTC2_Format;

    exports.SIGNED_RED_RGTC1_Format = SIGNED_RED_RGTC1_Format;

    exports.SRGBColorSpace = SRGBColorSpace;

    exports.SRGBTransfer = SRGBTransfer;

    exports.Scene = Scene;

    exports.ShaderChunk = ShaderChunk;

    exports.ShaderLib = ShaderLib;

    exports.ShaderMaterial = ShaderMaterial;

    exports.ShadowMaterial = ShadowMaterial;

    exports.Shape = Shape;

    exports.ShapeGeometry = ShapeGeometry;

    exports.ShapePath = ShapePath;

    exports.ShapeUtils = ShapeUtils;

    exports.ShortType = ShortType;

    exports.Skeleton = Skeleton;

    exports.SkeletonHelper = SkeletonHelper;

    exports.SkinnedMesh = SkinnedMesh;

    exports.Source = Source;

    exports.Sphere = Sphere;

    exports.SphereGeometry = SphereGeometry;

    exports.Spherical = Spherical;

    exports.SphericalHarmonics3 = SphericalHarmonics3;

    exports.SplineCurve = SplineCurve;

    exports.SpotLight = SpotLight;

    exports.SpotLightHelper = SpotLightHelper;

    exports.Sprite = Sprite;

    exports.SpriteMaterial = SpriteMaterial;

    exports.SrcAlphaFactor = SrcAlphaFactor;

    exports.SrcAlphaSaturateFactor = SrcAlphaSaturateFactor;

    exports.SrcColorFactor = SrcColorFactor;

    exports.StaticCopyUsage = StaticCopyUsage;

    exports.StaticDrawUsage = StaticDrawUsage;

    exports.StaticReadUsage = StaticReadUsage;

    exports.StereoCamera = StereoCamera;

    exports.StreamCopyUsage = StreamCopyUsage;

    exports.StreamDrawUsage = StreamDrawUsage;

    exports.StreamReadUsage = StreamReadUsage;

    exports.StringKeyframeTrack = StringKeyframeTrack;

    exports.SubtractEquation = SubtractEquation;

    exports.SubtractiveBlending = SubtractiveBlending;

    exports.TOUCH = TOUCH;

    exports.TangentSpaceNormalMap = TangentSpaceNormalMap;

    exports.TetrahedronGeometry = TetrahedronGeometry;

    exports.Texture = Texture;

    exports.TextureLoader = TextureLoader;

    exports.TorusGeometry = TorusGeometry;

    exports.TorusKnotGeometry = TorusKnotGeometry;

    exports.Triangle = Triangle;

    exports.TriangleFanDrawMode = TriangleFanDrawMode;

    exports.TriangleStripDrawMode = TriangleStripDrawMode;

    exports.TrianglesDrawMode = TrianglesDrawMode;

    exports.TubeGeometry = TubeGeometry;

    exports.TwoPassDoubleSide = TwoPassDoubleSide;

    exports.UVMapping = UVMapping;

    exports.Uint16BufferAttribute = Uint16BufferAttribute;

    exports.Uint32BufferAttribute = Uint32BufferAttribute;

    exports.Uint8BufferAttribute = Uint8BufferAttribute;

    exports.Uint8ClampedBufferAttribute = Uint8ClampedBufferAttribute;

    exports.Uniform = Uniform;

    exports.UniformsGroup = UniformsGroup;

    exports.UniformsLib = UniformsLib;

    exports.UniformsUtils = UniformsUtils;

    exports.UnsignedByteType = UnsignedByteType;

    exports.UnsignedInt248Type = UnsignedInt248Type;

    exports.UnsignedIntType = UnsignedIntType;

    exports.UnsignedShort4444Type = UnsignedShort4444Type;

    exports.UnsignedShort5551Type = UnsignedShort5551Type;

    exports.UnsignedShortType = UnsignedShortType;

    exports.VSMShadowMap = VSMShadowMap;

    exports.Vector2 = Vector2;

    exports.Vector3 = Vector3;

    exports.Vector4 = Vector4;

    exports.VectorKeyframeTrack = VectorKeyframeTrack;

    exports.VideoTexture = VideoTexture;

    exports.WebGL1Renderer = WebGL1Renderer;

    exports.WebGL3DRenderTarget = WebGL3DRenderTarget;

    exports.WebGLArrayRenderTarget = WebGLArrayRenderTarget;

    exports.WebGLCoordinateSystem = WebGLCoordinateSystem;

    exports.WebGLCubeRenderTarget = WebGLCubeRenderTarget;

    exports.WebGLMultipleRenderTargets = WebGLMultipleRenderTargets;

    exports.WebGLRenderTarget = WebGLRenderTarget;

    exports.WebGLRenderer = WebGLRenderer;

    exports.WebGLUtils = WebGLUtils;

    exports.WebGPUCoordinateSystem = WebGPUCoordinateSystem;

    exports.WireframeGeometry = WireframeGeometry;

    exports.WrapAroundEnding = WrapAroundEnding;

    exports.ZeroCurvatureEnding = ZeroCurvatureEnding;

    exports.ZeroFactor = ZeroFactor;

    exports.ZeroSlopeEnding = ZeroSlopeEnding;

    exports.ZeroStencilOp = ZeroStencilOp;

    exports._SRGBAFormat = _SRGBAFormat;

    exports.createCanvasElement = createCanvasElement;

    exports.sRGBEncoding = sRGBEncoding;


}));

Number
OpenLayers Number
Definition OpenLayers.js:61

transform
OpenLayers Projection transform
Definition OpenLayers.js:157

getParameters
OpenLayers Util getParameters
Definition OpenLayers.js:99

v3
OpenLayers Format GML v3
Definition OpenLayers.js:414

Response
OpenLayers Protocol Response
Definition OpenLayers.js:449

String
OpenLayers String
Definition OpenLayers.js:59

Array
OpenLayers Array
Definition OpenLayers.js:64

fromArray
OpenLayers Bounds fromArray
Definition OpenLayers.js:75

cache
OpenLayers Layer Google cache
Definition OpenLayers.js:275

Geometry
OpenLayers Geometry
Definition OpenLayers.js:343

degrees
OpenLayers INCHES_PER_UNIT degrees
Definition OpenLayers.js:100

style
OpenLayers Feature Vector style
Definition OpenLayers.js:301

Map
OpenLayers Map
Definition OpenLayers.js:159

v2
OpenLayers Layer Google v2
Definition OpenLayers.js:276

document
OpenLayers Format XML document
Definition OpenLayers.js:293

Curve
OpenLayers Geometry Curve
Definition OpenLayers.js:358

f
function f
Definition OpenLayers.js:159

v1
OpenLayers Format WFST v1
Definition OpenLayers.js:311

indexOf
OpenLayers Util indexOf
Definition OpenLayers.js:83

undefined
function undefined
Definition jquery.contextMenu.js:15

if
if(!$.ui||!$.ui.widget)
Definition jquery.contextMenu.js:47

factory
function factory
Definition jquery.mobile.custom.js:11

max
var max
Definition jquery.ui.position.js:16

position
$ position
Definition jquery.ui.position.js:67

round
var round
Definition jquery.ui.position.js:18

x
function x(t, e, i)
Definition leaflet.js:5

re
var re
Definition leaflet.js:5

this
this
Definition leaflet.js:5

ae
var ae
Definition leaflet.js:5

g
function g(t, e)
Definition leaflet.js:5

N
function N()
Definition leaflet.js:5

include
et et include
Definition leaflet.js:5

z
function z(t, e)
Definition leaflet.js:5

m
function m(t, e, i)
Definition leaflet.js:5

w
function w(t, e, i)
Definition leaflet.js:5

t
function t
Definition leaflet.js:5

B
var B
Definition leaflet.js:5

k
function k(t, e, i, n)
Definition leaflet.js:5

be
function be(t, e, i)
Definition leaflet.js:5

l
function l(t)
Definition leaflet.js:5

n
var n
Definition leaflet.js:5

o
var o
Definition leaflet.js:5

q
function q(t, i)
Definition leaflet.js:5

de
var de
Definition leaflet.js:5

u
function u()
Definition leaflet.js:5

dt
function dt(t, e)
Definition leaflet.js:5

T
function T(t)
Definition leaflet.js:5

v
function v(t, e, i)
Definition leaflet.js:5

te
function te(t)
Definition leaflet.js:5

h
function h(t)
Definition leaflet.js:5

i
function i(t, e)
Definition leaflet.js:5

P
function P(t, e, i)
Definition leaflet.js:5

$
var $
Definition leaflet.js:5

ce
var ce
Definition leaflet.js:5

A
var A
Definition leaflet.js:5

y
function y(t)
Definition leaflet.js:5

b
var b
Definition leaflet.js:5

e
var e
Definition leaflet.js:5

me
function me(t)
Definition leaflet.js:5

pt
var pt
Definition leaflet.js:5

p
function p(t, e, i)
Definition leaflet.js:5

at
function at(t, e, i, n)
Definition leaflet.js:5

r
function r(t)
Definition leaflet.js:5

it
var it
Definition leaflet.js:5

d
var d
Definition leaflet.js:5

s
function s(t, e)
Definition leaflet.js:5

j
function j(t, e, i)
Definition leaflet.js:5

version
var version
Definition panovisuInit.js:2

RGBA_S3TC_DXT3_Format
THREE RGBA_S3TC_DXT3_Format
Definition three.min1.js:6

ReverseSubtractEquation
THREE ReverseSubtractEquation
Definition three.min1.js:3

CustomBlending
THREE CustomBlending
Definition three.min1.js:3

BackSide
THREE BackSide
Definition three.min1.js:2

setLength
THREE ArrowHelper prototype setLength
Definition three.min1.js:740

CullFaceFrontBack
THREE CullFaceFrontBack
Definition three.min1.js:2

absellipse
THREE Path prototype absellipse
Definition three.min1.js:630

envmap_vertex
THREE ShaderChunk envmap_vertex
Definition three.min1.js:406

closePath
THREE CurvePath prototype closePath
Definition three.min1.js:617

lookAt
THREE Camera prototype lookAt
Definition three.min1.js:227

Sprite
THREE Sprite
Definition three.min1.js:359

LuminanceAlphaFormat
THREE LuminanceAlphaFormat
Definition three.min1.js:5

MeshLambertMaterial
THREE MeshLambertMaterial
Definition three.min1.js:296

IntType
THREE IntType
Definition three.min1.js:5

AddOperation
THREE AddOperation
Definition three.min1.js:4

setViewOffset
THREE PerspectiveCamera prototype setViewOffset
Definition three.min1.js:233

pose
THREE Skeleton prototype pose
Definition three.min1.js:341

Mesh
THREE Mesh
Definition three.min1.js:328

CubicBezierCurve
THREE CubicBezierCurve
Definition three.min1.js:650

morphnormal_vertex
THREE ShaderChunk morphnormal_vertex
Definition three.min1.js:391

Fog
THREE Fog
Definition three.min1.js:364

Texture
THREE Texture
Definition three.min1.js:315

envmap_pars_vertex
THREE ShaderChunk envmap_pars_vertex
Definition three.min1.js:397

NearestMipMapNearestFilter
THREE NearestMipMapNearestFilter
Definition three.min1.js:4

SplineCurve
THREE SplineCurve
Definition three.min1.js:652

bezierCurveTo
THREE Path prototype bezierCurveTo
Definition three.min1.js:628

getUtoTmapping
THREE Curve prototype getUtoTmapping
Definition three.min1.js:613

getCurveLengths
THREE CurvePath prototype getCurveLengths
Definition three.min1.js:618

LineCurve3
THREE LineCurve3
Definition three.min1.js:655

color_fragment
THREE ShaderChunk color_fragment
Definition three.min1.js:405

CurvePath
THREE CurvePath
Definition three.min1.js:616

BufferGeometry
THREE BufferGeometry
Definition three.min1.js:191

THREE
var THREE
Definition three.min1.js:2

defaultnormal_vertex
THREE ShaderChunk defaultnormal_vertex
Definition three.min1.js:402

Camera
THREE Camera
Definition three.min1.js:226

NearestFilter
THREE NearestFilter
Definition three.min1.js:4

RGBA_S3TC_DXT1_Format
THREE RGBA_S3TC_DXT1_Format
Definition three.min1.js:6

color_vertex
THREE ShaderChunk color_vertex
Definition three.min1.js:396

Matrix3
THREE Matrix3
Definition three.min1.js:85

envmap_pars_fragment
THREE ShaderChunk envmap_pars_fragment
Definition three.min1.js:392

Frustum
THREE Frustum
Definition three.min1.js:125

LineDashedMaterial
THREE LineDashedMaterial
Definition three.min1.js:290

updateMatrixWorld
THREE Bone prototype updateMatrixWorld
Definition three.min1.js:337

LineBasicMaterial
THREE LineBasicMaterial
Definition three.min1.js:289

getBoundingBox
THREE CurvePath prototype getBoundingBox
Definition three.min1.js:619

DefaultLoadingManager
THREE DefaultLoadingManager
Definition three.min1.js:272

OneMinusSrcColorFactor
THREE OneMinusSrcColorFactor
Definition three.min1.js:3

morphtarget_vertex
THREE ShaderChunk morphtarget_vertex
Definition three.min1.js:405

DstColorFactor
THREE DstColorFactor
Definition three.min1.js:3

FloatType
THREE FloatType
Definition three.min1.js:5

IcosahedronGeometry
THREE IcosahedronGeometry
Definition three.min1.js:733

SubtractiveBlending
THREE SubtractiveBlending
Definition three.min1.js:3

logdepthbuf_pars_fragment
THREE ShaderChunk logdepthbuf_pars_fragment
Definition three.min1.js:411

stop
THREE Animation prototype stop
Definition three.min1.js:665

quadraticCurveTo
THREE Path prototype quadraticCurveTo
Definition three.min1.js:627

FrontSide
THREE FrontSide
Definition three.min1.js:2

normal
THREE Triangle normal
Definition three.min1.js:141

specularmap_pars_fragment
THREE ShaderChunk specularmap_pars_fragment
Definition three.min1.js:399

ImageUtils
THREE ImageUtils
Definition three.min1.js:597

MultiplyBlending
THREE MultiplyBlending
Definition three.min1.js:3

OctahedronGeometry
THREE OctahedronGeometry
Definition three.min1.js:734

MeshPhongMaterial
THREE MeshPhongMaterial
Definition three.min1.js:300

map_fragment
THREE ShaderChunk map_fragment
Definition three.min1.js:395

UVMapping
THREE UVMapping
Definition three.min1.js:4

alphamap_pars_fragment
THREE ShaderChunk alphamap_pars_fragment
Definition three.min1.js:411

OneFactor
THREE OneFactor
Definition three.min1.js:3

Cache
THREE Cache
Definition three.min1.js:247

getTangentAt
THREE Curve prototype getTangentAt
Definition three.min1.js:614

morphtarget_pars_vertex
THREE ShaderChunk morphtarget_pars_vertex
Definition three.min1.js:399

FogExp2
THREE FogExp2
Definition three.min1.js:365

CompressedTexture
THREE CompressedTexture
Definition three.min1.js:319

PerspectiveCamera
THREE PerspectiveCamera
Definition three.min1.js:232

skinbase_vertex
THREE ShaderChunk skinbase_vertex
Definition three.min1.js:404

AlphaFormat
THREE AlphaFormat
Definition three.min1.js:5

SpriteMaterial
THREE SpriteMaterial
Definition three.min1.js:312

Skeleton
THREE Skeleton
Definition three.min1.js:338

Vector4
THREE Vector4
Definition three.min1.js:50

RepeatWrapping
THREE RepeatWrapping
Definition three.min1.js:4

TorusGeometry
THREE TorusGeometry
Definition three.min1.js:718

Loader
THREE Loader
Definition three.min1.js:248

WebGLRenderer
THREE WebGLRenderer
Definition three.min1.js:448

EventDispatcher
THREE EventDispatcher
Definition three.min1.js:148

logdepthbuf_fragment
THREE ShaderChunk logdepthbuf_fragment
Definition three.min1.js:392

LinearMipMapLinearFilter
THREE LinearMipMapLinearFilter
Definition three.min1.js:5

containsPoint
THREE Triangle containsPoint
Definition three.min1.js:143

Material
THREE Material
Definition three.min1.js:286

OneMinusDstAlphaFactor
THREE OneMinusDstAlphaFactor
Definition three.min1.js:3

getLengths
THREE Curve prototype getLengths
Definition three.min1.js:612

getPointAt
THREE Curve prototype getPointAt
Definition three.min1.js:610

CylinderGeometry
THREE CylinderGeometry
Definition three.min1.js:690

updateMorphTargets
THREE Mesh prototype updateMorphTargets
Definition three.min1.js:329

SrcColorFactor
THREE SrcColorFactor
Definition three.min1.js:3

lightmap_fragment
THREE ShaderChunk lightmap_fragment
Definition three.min1.js:405

RGB_S3TC_DXT1_Format
THREE RGB_S3TC_DXT1_Format
Definition three.min1.js:6

clone
THREE Camera prototype clone
Definition three.min1.js:227

lights_phong_pars_fragment
THREE ShaderChunk lights_phong_pars_fragment
Definition three.min1.js:403

LuminanceFormat
THREE LuminanceFormat
Definition three.min1.js:5

QuadraticBezierCurve3
THREE QuadraticBezierCurve3
Definition three.min1.js:655

skinnormal_vertex
THREE ShaderChunk skinnormal_vertex
Definition three.min1.js:389

lightmap_pars_fragment
THREE ShaderChunk lightmap_pars_fragment
Definition three.min1.js:394

dispose
THREE DirectionalLightHelper prototype dispose
Definition three.min1.js:752

map_particle_pars_fragment
THREE ShaderChunk map_particle_pars_fragment
Definition three.min1.js:388

UnsignedShort5551Type
THREE UnsignedShort5551Type
Definition three.min1.js:5

Box3
THREE Box3
Definition three.min1.js:77

AdditiveBlending
THREE AdditiveBlending
Definition three.min1.js:3

color_pars_fragment
THREE ShaderChunk color_pars_fragment
Definition three.min1.js:396

raycast
THREE PointCloud prototype raycast
Definition three.min1.js:322

skinning_pars_vertex
THREE ShaderChunk skinning_pars_vertex
Definition three.min1.js:410

PlaneGeometry
THREE PlaneGeometry
Definition three.min1.js:710

LatheGeometry
THREE LatheGeometry
Definition three.min1.js:708

UnsignedIntType
THREE UnsignedIntType
Definition three.min1.js:5

ClampToEdgeWrapping
THREE ClampToEdgeWrapping
Definition three.min1.js:4

fog_pars_fragment
THREE ShaderChunk fog_pars_fragment
Definition three.min1.js:391

getLength
THREE Curve prototype getLength
Definition three.min1.js:611

LinearMipMapNearestFilter
THREE LinearMipMapNearestFilter
Definition three.min1.js:5

absarc
THREE Path prototype absarc
Definition three.min1.js:630

normalmap_pars_fragment
THREE ShaderChunk normalmap_pars_fragment
Definition three.min1.js:393

MeshNormalMaterial
THREE MeshNormalMaterial
Definition three.min1.js:305

color_pars_vertex
THREE ShaderChunk color_pars_vertex
Definition three.min1.js:397

slerp
THREE Quaternion slerp
Definition three.min1.js:29

CullFaceBack
THREE CullFaceBack
Definition three.min1.js:2

WebGLProgram
THREE WebGLProgram
Definition three.min1.js:582

getPoint
THREE Curve prototype getPoint
Definition three.min1.js:610

Color
THREE Color
Definition three.min1.js:6

LinearFilter
THREE LinearFilter
Definition three.min1.js:5

UnsignedByteType
THREE UnsignedByteType
Definition three.min1.js:5

BoxGeometry
THREE BoxGeometry
Definition three.min1.js:685

alphatest_fragment
THREE ShaderChunk alphatest_fragment
Definition three.min1.js:387

addShape
THREE ExtrudeGeometry prototype addShape
Definition three.min1.js:695

Vector2
THREE Vector2
Definition three.min1.js:29

bumpmap_pars_fragment
THREE ShaderChunk bumpmap_pars_fragment
Definition three.min1.js:401

Scene
THREE Scene
Definition three.min1.js:361

bind
THREE SkinnedMesh prototype bind
Definition three.min1.js:344

ArcCurve
THREE ArcCurve
Definition three.min1.js:654

envmap_fragment
THREE ShaderChunk envmap_fragment
Definition three.min1.js:398

NearestMipMapLinearFilter
THREE NearestMipMapLinearFilter
Definition three.min1.js:4

SphereGeometry
THREE SphereGeometry
Definition three.min1.js:714

updateMatrix
THREE Sprite prototype updateMatrix
Definition three.min1.js:360

CubicBezierCurve3
THREE CubicBezierCurve3
Definition three.min1.js:656

logdepthbuf_vertex
THREE ShaderChunk logdepthbuf_vertex
Definition three.min1.js:399

Shape
THREE Shape
Definition three.min1.js:639

Path
THREE Path
Definition three.min1.js:625

NoBlending
THREE NoBlending
Definition three.min1.js:2

Triangle
THREE Triangle
Definition three.min1.js:141

ExtrudeGeometry
THREE ExtrudeGeometry
Definition three.min1.js:694

MultiplyOperation
THREE MultiplyOperation
Definition three.min1.js:4

UnsignedShortType
THREE UnsignedShortType
Definition three.min1.js:5

ellipse
THREE Path prototype ellipse
Definition three.min1.js:630

Plane
THREE Plane
Definition three.min1.js:129

TetrahedronGeometry
THREE TetrahedronGeometry
Definition three.min1.js:734

PolyhedronGeometry
THREE PolyhedronGeometry
Definition three.min1.js:729

BufferAttribute
THREE BufferAttribute
Definition three.min1.js:184

Ray
THREE Ray
Definition three.min1.js:113

MeshBasicMaterial
THREE MeshBasicMaterial
Definition three.min1.js:292

a
function a
Definition three.min1.js:151

updateProjectionMatrix
THREE OrthographicCamera prototype updateProjectionMatrix
Definition three.min1.js:231

PCFSoftShadowMap
THREE PCFSoftShadowMap
Definition three.min1.js:2

ByteType
THREE ByteType
Definition three.min1.js:5

Matrix4
THREE Matrix4
Definition three.min1.js:91

Vector3
THREE Vector3
Definition three.min1.js:35

map_pars_fragment
THREE ShaderChunk map_pars_fragment
Definition three.min1.js:389

EllipseCurve
THREE EllipseCurve
Definition three.min1.js:653

worldpos_vertex
THREE ShaderChunk worldpos_vertex
Definition three.min1.js:408

NormalBlending
THREE NormalBlending
Definition three.min1.js:3

OrthographicCamera
THREE OrthographicCamera
Definition three.min1.js:230

LineCurve
THREE LineCurve
Definition three.min1.js:648

SrcAlphaFactor
THREE SrcAlphaFactor
Definition three.min1.js:3

getPoints
THREE Curve prototype getPoints
Definition three.min1.js:611

SkinnedMesh
THREE SkinnedMesh
Definition three.min1.js:343

WebGLShader
THREE WebGLShader
Definition three.min1.js:592

specularmap_fragment
THREE ShaderChunk specularmap_fragment
Definition three.min1.js:400

RingGeometry
THREE RingGeometry
Definition three.min1.js:712

OneMinusDstColorFactor
THREE OneMinusDstColorFactor
Definition three.min1.js:3

Object3D
THREE Object3D
Definition three.min1.js:153

WebGLRenderTarget
THREE WebGLRenderTarget
Definition three.min1.js:578

splineThru
THREE Path prototype splineThru
Definition three.min1.js:629

Line
THREE Line
Definition three.min1.js:325

getPointsHoles
THREE Shape prototype getPointsHoles
Definition three.min1.js:640

getObjectForDistance
THREE LOD prototype getObjectForDistance
Definition three.min1.js:355

LoadingManager
THREE LoadingManager
Definition three.min1.js:272

lineTo
THREE Path prototype lineTo
Definition three.min1.js:626

DoubleSide
THREE DoubleSide
Definition three.min1.js:2

shadowmap_pars_fragment
THREE ShaderChunk shadowmap_pars_fragment
Definition three.min1.js:409

alphamap_fragment
THREE ShaderChunk alphamap_fragment
Definition three.min1.js:411

parse
THREE JSONLoader prototype parse
Definition three.min1.js:265

AddEquation
THREE AddEquation
Definition three.min1.js:3

BasicShadowMap
THREE BasicShadowMap
Definition three.min1.js:2

addLevel
THREE LOD prototype addLevel
Definition three.min1.js:355

c
var c
Definition three.min1.js:151

normalizeSkinWeights
THREE SkinnedMesh prototype normalizeSkinWeights
Definition three.min1.js:345

SubtractEquation
THREE SubtractEquation
Definition three.min1.js:3

CubeTexture
THREE CubeTexture
Definition three.min1.js:318

CullFaceFront
THREE CullFaceFront
Definition three.min1.js:2

extractPoints
THREE Shape prototype extractPoints
Definition three.min1.js:641

MixOperation
THREE MixOperation
Definition three.min1.js:4

TubeGeometry
THREE TubeGeometry
Definition three.min1.js:723

CullFaceNone
THREE CullFaceNone
Definition three.min1.js:2

fog_fragment
THREE ShaderChunk fog_fragment
Definition three.min1.js:400

SrcAlphaSaturateFactor
THREE SrcAlphaSaturateFactor
Definition three.min1.js:4

RGBAFormat
THREE RGBAFormat
Definition three.min1.js:5

default_vertex
THREE ShaderChunk default_vertex
Definition three.min1.js:388

Euler
THREE Euler
Definition three.min1.js:61

ShaderLib
THREE ShaderLib
Definition three.min1.js:417

DstAlphaFactor
THREE DstAlphaFactor
Definition three.min1.js:3

reset
THREE Animation prototype reset
Definition three.min1.js:666

shadowmap_pars_vertex
THREE ShaderChunk shadowmap_pars_vertex
Definition three.min1.js:405

object
object
Definition three.min1.js:2

ShaderChunk
THREE ShaderChunk
Definition three.min1.js:386

MirroredRepeatWrapping
THREE MirroredRepeatWrapping
Definition three.min1.js:4

area
a Triangulate area
Definition three.min1.js:610

getSpacedPoints
THREE Curve prototype getSpacedPoints
Definition three.min1.js:611

ShapeGeometry
THREE ShapeGeometry
Definition three.min1.js:705

CubeCamera
THREE CubeCamera
Definition three.min1.js:228

DataTexture
THREE DataTexture
Definition three.min1.js:320

PCFShadowMap
THREE PCFShadowMap
Definition three.min1.js:2

updateArcLengths
THREE Curve prototype updateArcLengths
Definition three.min1.js:612

UnsignedShort4444Type
THREE UnsignedShort4444Type
Definition three.min1.js:5

Quaternion
THREE Quaternion
Definition three.min1.js:19

Math
THREE Math
Definition three.min1.js:135

getTangent
THREE Curve prototype getTangent
Definition three.min1.js:613

map_particle_fragment
THREE ShaderChunk map_particle_fragment
Definition three.min1.js:396

RGBA_S3TC_DXT5_Format
THREE RGBA_S3TC_DXT5_Format
Definition three.min1.js:6

ShortType
THREE ShortType
Definition three.min1.js:5

LOD
THREE LOD
Definition three.min1.js:354

RawShaderMaterial
THREE RawShaderMaterial
Definition three.min1.js:312

arc
THREE Path prototype arc
Definition three.min1.js:629

moveTo
THREE Path prototype moveTo
Definition three.min1.js:626

lights_phong_fragment
THREE ShaderChunk lights_phong_fragment
Definition three.min1.js:390

WorldUVGenerator
THREE ExtrudeGeometry WorldUVGenerator
Definition three.min1.js:703

UniformsLib
THREE UniformsLib
Definition three.min1.js:413

CubeReflectionMapping
THREE CubeReflectionMapping
Definition three.min1.js:4

Bone
THREE Bone
Definition three.min1.js:336

CubeRefractionMapping
THREE CubeRefractionMapping
Definition three.min1.js:4

logdepthbuf_pars_vertex
THREE ShaderChunk logdepthbuf_pars_vertex
Definition three.min1.js:390

shadowmap_vertex
THREE ShaderChunk shadowmap_vertex
Definition three.min1.js:394

OneMinusSrcAlphaFactor
THREE OneMinusSrcAlphaFactor
Definition three.min1.js:3

add
THREE CurvePath prototype add
Definition three.min1.js:616

TorusKnotGeometry
THREE TorusKnotGeometry
Definition three.min1.js:720

ShaderMaterial
THREE ShaderMaterial
Definition three.min1.js:309

QuadraticBezierCurve
THREE QuadraticBezierCurve
Definition three.min1.js:649

load
THREE JSONLoader prototype load
Definition three.min1.js:262

CircleGeometry
THREE CircleGeometry
Definition three.min1.js:688

MeshDepthMaterial
THREE MeshDepthMaterial
Definition three.min1.js:304

UniformsUtils
THREE UniformsUtils
Definition three.min1.js:412

update
THREE Skeleton prototype update
Definition three.min1.js:342

copy
THREE RenderableVertex prototype copy
Definition three.min1.js:593

ZeroFactor
THREE ZeroFactor
Definition three.min1.js:3

skinning_vertex
THREE ShaderChunk skinning_vertex
Definition three.min1.js:396

Sphere
THREE Sphere
Definition three.min1.js:121

calculateInverses
THREE Skeleton prototype calculateInverses
Definition three.min1.js:340

Int32Array
var Int32Array
Definition types.js:903

Uint32Array
var Uint32Array
Definition types.js:904

Uint8ClampedArray
var Uint8ClampedArray
Definition types.js:900

global
function global
Definition types.js:37

Int8Array
var Int8Array
Definition types.js:898

pow
var pow
Definition types.js:73

floor
var floor
Definition types.js:69

Int16Array
var Int16Array
Definition types.js:901

Uint8Array
var Uint8Array
Definition types.js:899

Uint16Array
var Uint16Array
Definition types.js:902

log
var log
Definition types.js:70

Float32Array
var Float32Array
Definition types.js:905

min
var min
Definition types.js:72

DataView
global DataView
Definition types.js:1026

Float64Array
var Float64Array
Definition types.js:906